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单选题
According to a report in the online version of the journal Science, ______.
A
coral reefs in the Caribbean have declined by 80 percent in the last ten years.
B
coral cover in the region has fallen by 40 percent.
C
coral reefs in the Caribbean have declined to 30 percent.
D
the decline rate of coral cover equals rates of tropical forest loss.
参考答案
参考解析
解析：
录音中指出根据《科学》杂志网络版中的一项报告，在过去30年加勒比海（Caribbean）的珊瑚礁（coral reefs）已经减少了80%，该地区的珊瑚覆盖面（coral cover）从50%降到了10%，因此选项B正确。
【录音原文】
Coral reefs in the Caribbean have declined by 80 percent in the last three decades, according to a report in the online version of the journal Science. Coral cover in the region has fallen from 50 percent to 10 percent, the study shows-a rate of decline that exceeds rates of tropical forest loss.
录音中指出根据《科学》杂志网络版中的一项报告，在过去30年加勒比海（Caribbean）的珊瑚礁（coral reefs）已经减少了80%，该地区的珊瑚覆盖面（coral cover）从50%降到了10%，因此选项B正确。
【录音原文】
Coral reefs in the Caribbean have declined by 80 percent in the last three decades, according to a report in the online version of the journal Science. Coral cover in the region has fallen from 50 percent to 10 percent, the study shows-a rate of decline that exceeds rates of tropical forest loss.
更多 “单选题According to a report in the online version of the journal Science, ______.A coral reefs in the Caribbean have declined by 80 percent in the last ten years.B coral cover in the region has fallen by 40 percent.C coral reefs in the Caribbean have declined to 30 percent.D the decline rate of coral cover equals rates of tropical forest loss.” 相关考题
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共用题干
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Water一the Issue of This CenturyThe world is running short of freshwater. Populations are growing bigger and thirstier （渴的）,with the result that freshwater is becoming increasingly scarce（缺乏）.Half the world's wetlands have disappeared during the last century,while estimates suggest that wa- ter use will rise by 50% in the next 30 years.The World Bank report estimates that as much as half of the world's population,concentrated in Africa,the Middle East and south Asia,will face“severe water shortages”by 2025.Local water conflicts and the loss of freshwater ecosystems appear large in some re- gions.A similar picture emerges from the globe's salt water regions. Three-quarters of the world's people may live within 100km of the sea in 2025,putting even more pressure on stretched coastal ecosystems. Two thirds of fisheries（渔业）are exploited at or beyond their sustainable limits, and half the world's coral reefs（珊瑚礁）may perish in 100 years. Almost 60% of coral reefs and 34% of fish species are at risk from human activities,the Bank says.The report concludes that there is ample evidence to justify immediate and coordinated action to safeguard supplies and use water more efficiently.Fresh water consumption is rising quickly,and the availability of water in some regions is likely to become one of the most pressing issues of the 21st century.A third of the world's popu1ation一around two billion people一live in countries that are experiencing moderate to high water shortages.That proportion could rise to half or more in the next 30 years unless institutions（制度）change to ensure better conservation and alloca- tion of water.China is one country where the portents（征兆）are gloomy. The most waterstressed country in East Asia,China is exploiting 44%of its usable water,a figure projected to rise to6O%by 2020.Primary withdrawal of water of more than 60%is widely considered by water experts to exceed the environmental carrying capacity of a river basin system. AlthoughChina's total use appears still to be reasonable,it has several basins that are severely stressed environmentally.Withdrawals exceed environmental limits in Afghanistan and Pakistan,and will exceed them in India by 2020.In the Middle East and North Africa,only Morocco has unexploited water resources.The rest have exceeded environmental limits and many are mining aquifers （蓄水层）一bodies of water-bearing rock一the report says.Almost all coral reefs may disappear in 100 years.A: RightB: WrongC: Not mentioned
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共用题干
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共用题干
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共用题干
Caribbean IslandsWhat would you see if you took a cruise to the Caribbean Islands?Palm trees and coconuts（椰子）?White beaches and clear, blue ocean? Colorful corals（珊瑚）and even more colorful fishes and birds?You bet.There are thousands of islands in the Caribbean Sea.They are famous for their warm,tropical climate and great natural beauty.The Caribbean Islands form a chain that separates the Caribbean Sea from the rest of the Atlantic Ocean._________(1)Many of the islands were formed by the eruption （爆发）of ancient volcanoes（火山）.Others are low-lying coral islands that gradually rose from the ocean.The Caribbean Islands are known by several names._________(2)The explorer Christopher Columbus called the islands the Indies in 1492 because he thought he was near the coast of India.Later,Spain and France called the islands the Antilles.There are four large islands in the Caribbean Sea._________(3)These four islands are often called the Greater Antilles.Together,they account for about 90 per cent of the land area of the Caribbean lslands.The rest of the Caribbean Islands are much smaller._________(4)You can see why pirates such as the famous Blackbeard sailed these waters.There are countless small islands to bury treasure or hide on.The weather of the Caribbean Sea is almost always warm and sunny.Sandy beaches line the coasts of many islands._________(5)Many tourists arrive on cruise ships._________（3）A:But life on the Caribbean Islands is not always paradise.B:The earliest name used by Europeans is the Indies,later changed to the West Indies.C:They're like a long necklace that stretches between North and South America.D:They are Cuba,Puerto Rico,Jamaica,and Hispaniola.E:This is why millions of tourists visit the islands each year.F:Some of these islands are no more than tiny slivers（小片）of exposed coral.
考题
If you have a problem, don′t worry! Itis easy to say if you don′t have one yourself. But there are only a few peoplewho don′t have troubles. We call them cemeteries. Believe it or not, most of yourproblems may actually be good for you!
You may know about the Great Barrier Reef,running some 1800 miles from New Guinea to Australia. Visitors are often takento see the reef. On one tour, one visitor asked an interesting question. "I notice that the lagoon side ofthe reef looks pale and lifeless, while the ocean side is lively and colorful.Why is this?"
The guide answered: "The coral aroundthe lagoon side is in still water. It dies early with no challenge to itssurvival. The coral on the ocean side is always being worn by wind, waves and storms.It has to fight for its survival every day. As it is challenged, it changes andgrows healthy, and it grows strong." He added, "That′s the way it iswith every living thing."
It is the same with people. Challenged andtoughened, we come alive! Like coral by the sea, we grow. Physical problemsmake for a stronger body. Stress makes for a stronger mind. So, if you have problems,it′s no problem! Just tell yourself, "There I grow again!"
In the writer′s opinion, the people whodon′t have troubles are ______.A.the persons who go to Great Barrier Reef
B.the persons who have passed away
C.the persons who are being tested
D.the persons who are healthy
考题
If you have a problem, don′t worry! Itis easy to say if you don′t have one yourself. But there are only a few peoplewho don′t have troubles. We call them cemeteries. Believe it or not, most of yourproblems may actually be good for you!
You may know about the Great Barrier Reef,running some 1800 miles from New Guinea to Australia. Visitors are often takento see the reef. On one tour, one visitor asked an interesting question. "I notice that the lagoon side ofthe reef looks pale and lifeless, while the ocean side is lively and colorful.Why is this?"
The guide answered: "The coral aroundthe lagoon side is in still water. It dies early with no challenge to itssurvival. The coral on the ocean side is always being worn by wind, waves and storms.It has to fight for its survival every day. As it is challenged, it changes andgrows healthy, and it grows strong." He added, "That′s the way it iswith every living thing."
It is the same with people. Challenged andtoughened, we come alive! Like coral by the sea, we grow. Physical problemsmake for a stronger body. Stress makes for a stronger mind. So, if you have problems,it′s no problem! Just tell yourself, "There I grow again!"
The ocean side of the reef is livelyand colorful because______.A.it is in still water
B.it has no challenge to its survival
C.it has a lot of sunshine
D.it has to fight for its survival everyday
考题
If you have a problem, don′t worry! Itis easy to say if you don′t have one yourself. But there are only a few peoplewho don′t have troubles. We call them cemeteries. Believe it or not, most of yourproblems may actually be good for you!
You may know about the Great Barrier Reef,running some 1800 miles from New Guinea to Australia. Visitors are often takento see the reef. On one tour, one visitor asked an interesting question. "I notice that the lagoon side ofthe reef looks pale and lifeless, while the ocean side is lively and colorful.Why is this?"
The guide answered: "The coral aroundthe lagoon side is in still water. It dies early with no challenge to itssurvival. The coral on the ocean side is always being worn by wind, waves and storms.It has to fight for its survival every day. As it is challenged, it changes andgrows healthy, and it grows strong." He added, "That′s the way it iswith every living thing."
It is the same with people. Challenged andtoughened, we come alive! Like coral by the sea, we grow. Physical problemsmake for a stronger body. Stress makes for a stronger mind. So, if you have problems,it′s no problem! Just tell yourself, "There I grow again!"
The author′s attitude towardproblems can be described as ______.A.indifferent
B.neutral
C.positive
D.pessimistic
考题
If you have a problem, don′t worry! Itis easy to say if you don′t have one yourself. But there are only a few peoplewho don′t have troubles. We call them cemeteries. Believe it or not, most of yourproblems may actually be good for you!
You may know about the Great Barrier Reef,running some 1800 miles from New Guinea to Australia. Visitors are often takento see the reef. On one tour, one visitor asked an interesting question. "I notice that the lagoon side ofthe reef looks pale and lifeless, while the ocean side is lively and colorful.Why is this?"
The guide answered: "The coral aroundthe lagoon side is in still water. It dies early with no challenge to itssurvival. The coral on the ocean side is always being worn by wind, waves and storms.It has to fight for its survival every day. As it is challenged, it changes andgrows healthy, and it grows strong." He added, "That′s the way it iswith every living thing."
It is the same with people. Challenged andtoughened, we come alive! Like coral by the sea, we grow. Physical problemsmake for a stronger body. Stress makes for a stronger mind. So, if you have problems,it′s no problem! Just tell yourself, "There I grow again!"
After reading this passage, we should______.A.live in our comfort zone
B.live in the ocean side of the reef
C.face the test and challenge bravely
D.stay away from any trouble
考题
下面哪两种型号的交换机的主控板卡是一样的？请选择（）A、Coral IPX500和800B、Coral IPX800和3000C、Coral IPX500和5000D、Coral IPX3000和6000
考题
单选题Which of the following is true about coral reefs?A
They play a significant role in biodiversity.B
They account for 25% of the marine life.C
More than a quarter of marine life feed on them.D
They are threatened by marine life and could be killed.
考题
单选题According to a report in the online version of the journal Science, ______.A
coral reefs in the Caribbean have declined by 80 percent in the last ten years.B
coral cover in the region has fallen by 40 percent.C
coral reefs in the Caribbean have declined to 30 percent.D
the decline rate of coral cover equals rates of tropical forest loss.
考题
单选题Why are coral reefs called the rainforests of the sea?A
Because they are home to a wide varie of sea life.B
Because they can protect our coasts from storms.C
Because they might supply natural medicines.D
Because they look like rainforests.
考题
单选题According to the passage,_____is the biggest threat to coral reefs.A
pollutionB
overfishingC
industrial activityD
climate change
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