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共用题干
A Great Quake Coming?

Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they
can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed
hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's
bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults
are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground
shakes.
To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre-
diet how bad the damage might be when the next one happens.
One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists
had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second.
During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.
At such high speeds,massive amounts of pressure build up,generating underground waves that can
cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled
away from the city during the 1906 event.As bad as the damage was,it could have been far worse.
Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that
earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data,
however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62
percent.
New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the
city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensive
damage.
People who live there today tend to feel safe because San Francisco has remained pretty quiet for a
while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-
ter of when.

Earthquakes rarely happened in San Francisco before 1906.
A:Right
B:Wrong
C:Not mentioned

参考答案

参考解析
解析：短文第一段的倒数第兰句提到至少有7条地质断层线穿越旧金山。
短文虽然说旧金山大地震的破坏力非常大，但没有明确指出其程度是美国历史之最。
从第兰段最后一句话可知答案。
第五段的第二句话提到1906年前地震频繁。
倒数第二段提到：城里超过84％的建筑是旧的、不坚固的。所以旧金山并没有为地震做好准备。
第五段的最后一句话说科学家们顶测地震发生的概率荃少为62%，但是这并不意味着 科学家们就能预测出准确的时间，最后一段也只说明这是个时间问题，而没有说出具体时间。
短文末尾提到：问题已不再是“是否”将会发生大地震，而是“什么时候”会发生。第3部分：概括大意与完成句子
更多 “共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre- diet how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensivedamage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-ter of when.Earthquakes rarely happened in San Francisco before 1906.A:RightB:WrongC:Not mentioned ” 相关考题
考题 Text 3Everyone has heard of the San Andreas fault, which constantly threatens California and the West Coast with earth- quakes. But how many people know about the equally serious New Madrid fault in Missouri.'?Between December of 1811 and February of 1812, three major earthquakes occurred, all centered around the town of New Madrid, Missouri, on the Mississippi River. Property damage was severe.Buildings in the area were almost dest oyed. Whole forests fell at once, and huge cracks opened in the ground, allowing smell of sulfur to filter upward.The Mississippi River itself completely changed character, developing sudden rapids and whirlpools. Several times it changed its course, and once, according to some observers, it actually appeared to run backwards. Few people were killed in the New Madrid earthquakes, probably simply because few people lived in the area in 1811; but the severity of the earth- quakes are shown by the fact that the shock waves rang bells in church towers in Charleston, South Carolina, on the coast. Buildings shook in New York City, and clocks were stopped in Washington D.C. Scientists now know that America's two major faults are essentially different. The San Andreas is a horizontal boundary between two major land masses that are slowly moving in opposite directions. California earthquakes result when the movement of these two masses suddenly lurches forward.The New Madrid fault, on the other hand, is a vertical fault; at some point, possibly hundreds of millions of years ago, rock was pushed up toward the surface, probably by volcanoes under the surface. Suddenly, the volcanoes cooled and the rock collapsed, leaving huge cracks. Even now', the rock continues to settle downwards, and sudden sinking motions trigger earthquakes in the region. The fault itself, a large crack in this layer of rock, with dozens of other cracks that split off from it, extends from northeast Arkansas through Missouri and into southern Illinois.Scientists who have studied the New Madrid fault say there have been numerous smaller quakes in the area since 1811; these smaller quakes indicate that larger ones are probably coming, but rite scientists say they have no method of predicting when a large earthquake will occur.31. This passage is mainly about ______.A) the New Madrid fault in MissouriB) the San Andreas and the New Madrid faultsC) the causes of faultsD) current scientific knowledge about faults
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Few earthquakes happen without people'S awareness.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.The earthquake is the most unpredictable natural disaster.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Oklahoma is an area often experiencing natural disasters.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Seismometers can identify and locate most of the earthquakes in China.A:RightB:WrongC:Not mentioned
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考题 共用题干 第一篇How to Do with Earthquake?Ideally,people would like to know when an earthquake is going to happen and how bad it willbe.In both Japan and China,people have long believed that earthquakes can be forecast. In Japan, scientists have wired the Earth and sea to detect movements.The Chinese have traditionally watched animals and plants for warning signs of earthquakes.For example,the Chinese have noted that before an earthquake,hens' behavior changes一they refuse to enter their cages at night. They have also noticed that snakes come out of the ground to freeze to death and that dogs bark a lot,even normally quiet dogs.Before the Hanshin earthquake in Japan,there were reports of large schools of fish swimming near the surface of the water. Certain birds,like pigeons,also seemed to be especially noisy and were reported to be flying in unusual patterns before the earthquake.Perhaps most interesting,and most easily measured,is a chemical change in ground water before a quake.Experimental data seem to indicate that the amount of radon(Rn)in the water under the surface of the Earth waxes before an earthquake.People would also like to be able to prevent the great destruction of property caused by earthquakes.After all,most of the people who die in earthquakes are killed by falling buildings.Therefore,building structures that can withstand the power of earthquakes is a major concern.Steel seems to be the best material,but not if it is welded to form a rigid structure.Many new structures are built with a new type of steel joint,an I-joint,which appears to be the most durable type of joint. These joints of steel can move without breaking. Also,to prevent property damage,architects now design buildings so that the building's columns and horizontal beams are of equal strength,and vertical support columns are inserted deep into solid soil.In addition,many new houses have relatively light roofs and strong walls.Concrete pillars for highway bridges that previously only had steel rods inside are now enclosed in steel.Besides working to improve building structures,people in areas where earthquakes are common need to prepare for the possibility of a great earthquake.They should regularly check and reinforce their homes,place heavy objects in low positions,attach cupboards and cabinets to walls,and fasten doors so that they will not open accidentally during an earthquake.According to the passage,the amount of radon(Rn)in the water may______before earthquake.A:increase B:reduce C:not change D:disappear
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考题 共用题干 第一篇How to Do with Earthquake?Ideally,people would like to know when an earthquake is going to happen and how bad it willbe.In both Japan and China,people have long believed that earthquakes can be forecast. In Japan, scientists have wired the Earth and sea to detect movements.The Chinese have traditionally watched animals and plants for warning signs of earthquakes.For example,the Chinese have noted that before an earthquake,hens' behavior changes一they refuse to enter their cages at night. They have also noticed that snakes come out of the ground to freeze to death and that dogs bark a lot,even normally quiet dogs.Before the Hanshin earthquake in Japan,there were reports of large schools of fish swimming near the surface of the water. Certain birds,like pigeons,also seemed to be especially noisy and were reported to be flying in unusual patterns before the earthquake.Perhaps most interesting,and most easily measured,is a chemical change in ground water before a quake.Experimental data seem to indicate that the amount of radon(Rn)in the water under the surface of the Earth waxes before an earthquake.People would also like to be able to prevent the great destruction of property caused by earthquakes.After all,most of the people who die in earthquakes are killed by falling buildings.Therefore,building structures that can withstand the power of earthquakes is a major concern.Steel seems to be the best material,but not if it is welded to form a rigid structure.Many new structures are built with a new type of steel joint,an I-joint,which appears to be the most durable type of joint. These joints of steel can move without breaking. Also,to prevent property damage,architects now design buildings so that the building's columns and horizontal beams are of equal strength,and vertical support columns are inserted deep into solid soil.In addition,many new houses have relatively light roofs and strong walls.Concrete pillars for highway bridges that previously only had steel rods inside are now enclosed in steel.Besides working to improve building structures,people in areas where earthquakes are common need to prepare for the possibility of a great earthquake.They should regularly check and reinforce their homes,place heavy objects in low positions,attach cupboards and cabinets to walls,and fasten doors so that they will not open accidentally during an earthquake.Why are building structures a major concern for people?A:Because they can make buildings pleasing to people's eyes.B:Because people are often killed by falling buildings in earthquakes.C:Because sometimes they are costly.D:Because people want to cut budget by designing new types of buildings.
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考题 共用题干 第一篇How to Do with Earthquake?Ideally,people would like to know when an earthquake is going to happen and how bad it willbe.In both Japan and China,people have long believed that earthquakes can be forecast. In Japan, scientists have wired the Earth and sea to detect movements.The Chinese have traditionally watched animals and plants for warning signs of earthquakes.For example,the Chinese have noted that before an earthquake,hens' behavior changes一they refuse to enter their cages at night. They have also noticed that snakes come out of the ground to freeze to death and that dogs bark a lot,even normally quiet dogs.Before the Hanshin earthquake in Japan,there were reports of large schools of fish swimming near the surface of the water. Certain birds,like pigeons,also seemed to be especially noisy and were reported to be flying in unusual patterns before the earthquake.Perhaps most interesting,and most easily measured,is a chemical change in ground water before a quake.Experimental data seem to indicate that the amount of radon(Rn)in the water under the surface of the Earth waxes before an earthquake.People would also like to be able to prevent the great destruction of property caused by earthquakes.After all,most of the people who die in earthquakes are killed by falling buildings.Therefore,building structures that can withstand the power of earthquakes is a major concern.Steel seems to be the best material,but not if it is welded to form a rigid structure.Many new structures are built with a new type of steel joint,an I-joint,which appears to be the most durable type of joint. These joints of steel can move without breaking. Also,to prevent property damage,architects now design buildings so that the building's columns and horizontal beams are of equal strength,and vertical support columns are inserted deep into solid soil.In addition,many new houses have relatively light roofs and strong walls.Concrete pillars for highway bridges that previously only had steel rods inside are now enclosed in steel.Besides working to improve building structures,people in areas where earthquakes are common need to prepare for the possibility of a great earthquake.They should regularly check and reinforce their homes,place heavy objects in low positions,attach cupboards and cabinets to walls,and fasten doors so that they will not open accidentally during an earthquake.Who watch animals and plants for warning signs of earthquakes?A:People in most countries. B:The Chinese.C:The Japanese. D:Both B and C.
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考题 共用题干 第一篇How to Do with Earthquake?Ideally,people would like to know when an earthquake is going to happen and how bad it willbe.In both Japan and China,people have long believed that earthquakes can be forecast. In Japan, scientists have wired the Earth and sea to detect movements.The Chinese have traditionally watched animals and plants for warning signs of earthquakes.For example,the Chinese have noted that before an earthquake,hens' behavior changes一they refuse to enter their cages at night. They have also noticed that snakes come out of the ground to freeze to death and that dogs bark a lot,even normally quiet dogs.Before the Hanshin earthquake in Japan,there were reports of large schools of fish swimming near the surface of the water. Certain birds,like pigeons,also seemed to be especially noisy and were reported to be flying in unusual patterns before the earthquake.Perhaps most interesting,and most easily measured,is a chemical change in ground water before a quake.Experimental data seem to indicate that the amount of radon(Rn)in the water under the surface of the Earth waxes before an earthquake.People would also like to be able to prevent the great destruction of property caused by earthquakes.After all,most of the people who die in earthquakes are killed by falling buildings.Therefore,building structures that can withstand the power of earthquakes is a major concern.Steel seems to be the best material,but not if it is welded to form a rigid structure.Many new structures are built with a new type of steel joint,an I-joint,which appears to be the most durable type of joint. These joints of steel can move without breaking. Also,to prevent property damage,architects now design buildings so that the building's columns and horizontal beams are of equal strength,and vertical support columns are inserted deep into solid soil.In addition,many new houses have relatively light roofs and strong walls.Concrete pillars for highway bridges that previously only had steel rods inside are now enclosed in steel.Besides working to improve building structures,people in areas where earthquakes are common need to prepare for the possibility of a great earthquake.They should regularly check and reinforce their homes,place heavy objects in low positions,attach cupboards and cabinets to walls,and fasten doors so that they will not open accidentally during an earthquake.What should people do to prepare for earthquakes?A:Check and reinforce their homes.B:Place light objects in low positions.C:Build strong roofs and light walls.D:Attach doors to walls.
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考题 共用题干 Study Helps Predict Big Mediterranean Quake1.Scientists have found evidence that an overlooked fault in the eastern Mediterranean is likely to produce an earthquake and tsunami every 800 years as powerful as the one that destroyed Alexandria in AD 365.2.Using radiocarbon dating techniques,simulations and computer models,the researchers recreated the ancient disaster in order to identify the responsible fault."We are saying there is probably a repeat time of 800 years for this kind of earthquake,"said Ms Beth Shaw,an earthquake scientist at the University of Cambridge,who led the study. Scientists study past earthquakes in order to deter-mine the future possibility of similar large shocks.3.Identifying the fault for the AD 365 earthquake and tsunami is important for the tens of millions of people in the region,Ms.Shaw said.The fault close to the southwest coast of Crete last produced a big enough quake to generate a tsunami about 1300,which means the next powerful one could come in the next 100 years,she added in a telephone interview.4.Ms.Shaw and her colleagues calculate the likely intervals by measuring the motion of either side of the fault to find how often such large earthquakes would have to occur to account for that level of motion,she said.Their computer model suggested an 8 magnitude quake on the fault would pro-duce a tsunami that floods the coastal regions of Alexandria and North Africa,the southern coast of Greece and Sicily all the way up the Adriati to Dubrovnik.This would be similar to the ancient quake in AD 365 that caused widespread destruction in much of Greece and unleashed a tsunami that flooded Alexandria and the Nile Delta likely killing tens of thousands of people,she said. Radiocarbon dating techniques can be used to identify the age of the earth.A:Right B:Wrong C:Not mentioned
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考题 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Seismometers can identify and locate most of the earthquakes in China.A: RightB: WrongC: Not mentioned
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考题 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Oklahoma is an area often experiencing natural disasters.A: RightB: WrongC: Not mentioned
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考题 共用题干 Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Few earthquakes happen without people's awareness.A: RightB: WrongC: Not mentioned
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考题 共用题干 Earthquake1.Every year earthquakes are responsible for a large number of deaths and a vast amount of destruction in various parts of the world.Most of these damaging earthquakes occur either in a narrow belt which surrounds the Pacific Ocean or in a line which extends from Burma to the Alps in Europe. Some of the destruction is directly caused by the quake itself. An example of this is the collapse of buildings as a result of the quake itself. Other damage results from landslides or major fires which are initiated by the quake.2.There are about a million quakes a year. Fortunately,however,not all of them are destructive.The intensity of an earthquake is measured on the Richter Scale,which goes from 0 upward. The highest scale recorded to date is 8.9.Major damage generally occurs from quakes ranging upwards from 6.0.3.The actual cause of the quake itself is the breaking of rocks at or below the earth's surface. This is produced by pressure which scientists believe may be due to a number of reasons, two of which are the expansion and contraction of the earth's crust and continental drift.4.In order to limit the damage and to prevent some of the suffering resulting from earthquakes, scientists are working on ways to enable accurate prediction.Special instruments are used to help people record,for example,shaking of the earth.Scientists are trying to find methods that will enable them to indicate the exact time,location and size of an earthquake.5.Certain phenomena have been observed which are believed to be signs of imminent earth-quakes.These include strange behaviors of some animals,the changes in the content of mineral water,etc.The magnetic properties of rocks may also display special pattern before major earthquakes happen.Paragraph 2_______.A:Earthquakes forecastB:Historical records of earthquakesC:Intensities of earthquakesD:Cause of earthquakesE:Indications of earthquakes F: Damaging earthquakes
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考题 共用题干 Earthquake1.Every year earthquakes are responsible for a large number of deaths and a vast amount of destruction in various parts of the world.Most of these damaging earthquakes occur either in a narrow belt which surrounds the Pacific Ocean or in a line which extends from Burma to the Alps in Europe. Some of the destruction is directly caused by the quake itself. An example of this is the collapse of buildings as a result of the quake itself. Other damage results from landslides or major fires which are initiated by the quake.2.There are about a million quakes a year. Fortunately,however,not all of them are destructive.The intensity of an earthquake is measured on the Richter Scale,which goes from 0 upward. The highest scale recorded to date is 8.9.Major damage generally occurs from quakes ranging upwards from 6.0.3.The actual cause of the quake itself is the breaking of rocks at or below the earth's surface. This is produced by pressure which scientists believe may be due to a number of reasons, two of which are the expansion and contraction of the earth's crust and continental drift.4.In order to limit the damage and to prevent some of the suffering resulting from earthquakes, scientists are working on ways to enable accurate prediction.Special instruments are used to help people record,for example,shaking of the earth.Scientists are trying to find methods that will enable them to indicate the exact time,location and size of an earthquake.5.Certain phenomena have been observed which are believed to be signs of imminent earth-quakes.These include strange behaviors of some animals,the changes in the content of mineral water,etc.The magnetic properties of rocks may also display special pattern before major earthquakes happen.Earthquakes can be predicted by observing__________.A:by the quake itselfB:not be preventedC:to cause damage of property and loss of livesD:of a possible earthquakeE:the unusual behaviors of some animals F: the strange behaviors of human beings
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考题 共用题干 Earthquake1.Every year earthquakes are responsible for a large number of deaths and a vast amount of destruction in various parts of the world.Most of these damaging earthquakes occur either in a narrow belt which surrounds the Pacific Ocean or in a line which extends from Burma to the Alps in Europe. Some of the destruction is directly caused by the quake itself. An example of this is the collapse of buildings as a result of the quake itself. Other damage results from landslides or major fires which are initiated by the quake.2.There are about a million quakes a year. Fortunately,however,not all of them are destructive.The intensity of an earthquake is measured on the Richter Scale,which goes from 0 upward. The highest scale recorded to date is 8.9.Major damage generally occurs from quakes ranging upwards from 6.0.3.The actual cause of the quake itself is the breaking of rocks at or below the earth's surface. This is produced by pressure which scientists believe may be due to a number of reasons, two of which are the expansion and contraction of the earth's crust and continental drift.4.In order to limit the damage and to prevent some of the suffering resulting from earthquakes, scientists are working on ways to enable accurate prediction.Special instruments are used to help people record,for example,shaking of the earth.Scientists are trying to find methods that will enable them to indicate the exact time,location and size of an earthquake.5.Certain phenomena have been observed which are believed to be signs of imminent earth-quakes.These include strange behaviors of some animals,the changes in the content of mineral water,etc.The magnetic properties of rocks may also display special pattern before major earthquakes happen.Scientists have been working hard to warn people__________. A:by the quake itselfB:not be preventedC:to cause damage of property and loss of livesD:of a possible earthquakeE:the unusual behaviors of some animals F: the strange behaviors of human beings
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考题 共用题干 Earthquake1.Every year earthquakes are responsible for a large number of deaths and a vast amount of destruction in various parts of the world.Most of these damaging earthquakes occur either in a narrow belt which surrounds the Pacific Ocean or in a line which extends from Burma to the Alps in Europe. Some of the destruction is directly caused by the quake itself. An example of this is the collapse of buildings as a result of the quake itself. Other damage results from landslides or major fires which are initiated by the quake.2.There are about a million quakes a year. Fortunately,however,not all of them are destructive.The intensity of an earthquake is measured on the Richter Scale,which goes from 0 upward. The highest scale recorded to date is 8.9.Major damage generally occurs from quakes ranging upwards from 6.0.3.The actual cause of the quake itself is the breaking of rocks at or below the earth's surface. This is produced by pressure which scientists believe may be due to a number of reasons, two of which are the expansion and contraction of the earth's crust and continental drift.4.In order to limit the damage and to prevent some of the suffering resulting from earthquakes, scientists are working on ways to enable accurate prediction.Special instruments are used to help people record,for example,shaking of the earth.Scientists are trying to find methods that will enable them to indicate the exact time,location and size of an earthquake.5.Certain phenomena have been observed which are believed to be signs of imminent earth-quakes.These include strange behaviors of some animals,the changes in the content of mineral water,etc.The magnetic properties of rocks may also display special pattern before major earthquakes happen.Not all earthquakes are strong enough___________.A:by the quake itselfB:not be preventedC:to cause damage of property and loss of livesD:of a possible earthquakeE:the unusual behaviors of some animals F: the strange behaviors of human beings
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考题 共用题干 Earthquake1.Every year earthquakes are responsible for a large number of deaths and a vast amount of destruction in various parts of the world.Most of these damaging earthquakes occur either in a narrow belt which surrounds the Pacific Ocean or in a line which extends from Burma to the Alps in Europe. Some of the destruction is directly caused by the quake itself. An example of this is the collapse of buildings as a result of the quake itself. Other damage results from landslides or major fires which are initiated by the quake.2.There are about a million quakes a year. Fortunately,however,not all of them are destructive.The intensity of an earthquake is measured on the Richter Scale,which goes from 0 upward. The highest scale recorded to date is 8.9.Major damage generally occurs from quakes ranging upwards from 6.0.3.The actual cause of the quake itself is the breaking of rocks at or below the earth's surface. This is produced by pressure which scientists believe may be due to a number of reasons, two of which are the expansion and contraction of the earth's crust and continental drift.4.In order to limit the damage and to prevent some of the suffering resulting from earthquakes, scientists are working on ways to enable accurate prediction.Special instruments are used to help people record,for example,shaking of the earth.Scientists are trying to find methods that will enable them to indicate the exact time,location and size of an earthquake.5.Certain phenomena have been observed which are believed to be signs of imminent earth-quakes.These include strange behaviors of some animals,the changes in the content of mineral water,etc.The magnetic properties of rocks may also display special pattern before major earthquakes happen.Not all damage during an earthquake is caused___________.A:by the quake itselfB:not be preventedC:to cause damage of property and loss of livesD:of a possible earthquakeE:the unusual behaviors of some animals F: the strange behaviors of human beings
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考题 共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre- diet how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensivedamage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-ter of when.A major earthquake striking San Francisco someday is inevitable.A:RightB:WrongC:Not mentioned
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考题 共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre- diet how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensivedamage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-ter of when.San Francisco is fully prepared br another big earthquake.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.Oklahoma is an area often experiencing natural disasters.A:RightB:WrongC:Not mentioned
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考题 共用题干 Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.Seismorneters can identify and locate most of the earthquakes in China.A:RightB:WrongC:Not mentioned
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考题 共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre- diet how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensivedamage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-ter of when.Scientists will be able to predict the exact time of an earthquake soon.A:RightB:WrongC:Not mentioned
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考题 共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre- diet how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensivedamage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-ter of when.The 1906 earthquake in San Francisco is the most severe one in American history.A:RightB:WrongC:Not mentioned
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考题 共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre- diet how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensivedamage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-ter of when.The San Francisco area is located above several active fault lines.A:RightB:WrongC:Not mentioned
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考题 共用题干 A Great Quake Coming?Everyone who lives in San Francisco knows that earthquakes are common in the Bay Area一and they can be devastating. In 1906,for example,a major quake destroyed about 28,000 buildings and killed hundreds,perhaps thousands of people.Residents now wonder when the next"Big One"will strike.It's bound to happen someday. At least seven active fault（断层）lines run through the San Francisco area. Faults are places where pieces of Earth'S crust（地壳）slide past each other.When these pieces slip,the ground shakes.To prepare for that day,scientists are using new techniques to reanalyze the 1906 earthquake and pre- diet how bad the damage might be when the next one happens.One new finding about the 1906 earthquake is that the San Andreas fault split apart faster than scientists had assumed at the time. During small earthquakes,faults rupture（断裂）at about 2.7 kilometers per second. During bigger quakes,however.ruptures can happen at rates faster than 3.5 kilometers per second.At such high speeds,massive amounts of pressure build up,generating underground waves that can cause more damage than the quake itself. Lucky for San Francisco , these pressure pulses（脉冲）traveled away from the city during the 1906 event.As bad as the damage was,it could have been far worse.Looking ahead,scientists are trying to predict when the next major quake will occur. Records show that earthquakes were common before 1906.Since then,the area has been relatively quiet.Patterns in the data, however,suggest that the probability of a major earthquake striking the Bay Area before 2032 is at least 62percent.New buildings in San Francisco are quite safe in case of future quakes.Still,more than S4 percent of the city’s buildings are old and weak.Analyses suggest that another massive earthquake would cause extensivedamage.People who live there today tend to feel safe because San Francisco has remained pretty quiet for a while.According to the new research,however,it's not a matter of"if" the Rig One will hit.It',just a mat-ter of when.The highest speed of fault ruptures in the 1906 quake was more than 3.5kiiometors per second.A:RightB:WrongC:Not mentioned
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考题 单选题A Why less people were killed in the earthquake in Los Angeles.B Changes made to construction methods of buildings and highways.C How to make buildings more resistant to earthquake.D The outline of the history of the development of quake-resistant building materials.
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