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牛轭湖（oxbow lake）
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Passage ThreeA group of scientists rowing toward the center of a lake saw something shocking. They turned back as fast as they could. What had they seen.? The lake was boiling!The group was investigating a crater lake in the mountains of St. Vincent. A crater lake is the mouth of a volcano that has been dormant for some time and has filled with water.This particular crater was the tip of a volcano called Soufriere, which erupted last in 1902. Since that time, it had not shown any signs of action. But in the fall of 1971, mountain climbers who had hiked near the lake returned to the lowlands with strange stories. They said the water had turned yellow and was giving off a smell like burnt eggs. A seething fog was rising from the lake's surface.Local scientists rushed to Soufriere to see if this might be the beginning of a new volcanic explosion. They found a huge black mass in the middle of the water. It was a great blob 1,000 feet long and 300 feet wide. Lava had pushed up through the bottom of the lake and formed a new island.The investigators wanted to make sure that the volcano was safe, and that the lava would not over- flow into the surrounding countryside. But they could never reach the island to study it, because the lava was so hot that the water around it bubbled and boiled.44. This passage is about ______.A. mountain climbingB. a boiling lakeC. a new volcanic islandD. a mysterious blob
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Passage FiveThe Northern Pike is a very bad fish. It is a big, hungry fish, and swallows little fish such as trout and perch. Many Northern Pikes live in Lake Davis. They are killing all the smaller fish in the lake. The Northern Pike are a serious threat to the lake because they eat all the smaller fish. Soon, all other species of fish in the lake will be killed off. This is not healthy for the environment.Experts are afraid that the Northern Pike will swim out of Lake Davis through many smaller rivers that feed into the lake. They could spread all over the country and damage many other water environments. If that happens, it would be too late to stop the Northern Pike.For ten years, officials have been trying to remove the Northern Pike from Lake Davis. They haw. tried using nets, explosives and poisons. However, the Northern Pike population is still doing well in Lake Davis. Many people do not like the idea of using poison to kill the fish. They worry that the poi- sons are bad for humans who use the water. No trace of the poisons has ever been found in local wells, however.Scientists are going to try the poison again. This time, they will drain the lake before they add the poison to the water. A public hearing will be held to talk about the problem.52. Why are some people against the use of poisons to kill Northern Pike?A. Fishermen will be poisoned too.B. The poisons are expensive.C. They think that wells will be polluted.D. The lake will become unsafe.
考题
The police found the murder weapon at ( ).
A、the bottom of the lakeB、the bottom of lakeC、bottom of the lakeD、bottom of a lake
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The largest lake in Britain is _____.
A.the Lough NeageB.Windermere WaterC.Coniston WaterD.the Lake District
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共用题干
The Exploding Lakes of CameroonWhat comes to mind when you think of a lake?You probably imagine a pretty scene with blue water, birds,and fish.For the people in the northwestern Cameroon,however,the image is very different.For them, lakes may mean terrible disasters.In 1984,poisonous gases exploded out of Lake Monoun and came down into the nearby villages,killing thirty-seven people.Two years later,Lake Nyos erupted.A cloud of gases rolled down the hills and into the valleys and killed 1,700 people.Lake Nyos and Lake Monoun are crater（火山口）lakes.They were formed when water collected in the craters of old volcanoes.The volcanoes under Lake Nyos and Lake Monoun are not active anymore.However, poisonous gases from the center of the earth continue to flow up through cracks in the bottom of the lake.This is normal in a crater lake.In most crater lakes,these gases are released often because the water"turns over" regularly.That is,the water from the bottom of the lake rises and mixes with the water at the top,allowing the gases to escape slowly.However,in Lakes Nyos and Monoun,there is no regular turning over.No one knows the reason for this fact,but as a result,these lakes have more gases trapped at the bottom than other crater lakes.In fact, scientists who have studied Lakes Nyos and Monoun have found 16,000 times more gases.When a strong wind,cool weather,a storm,or a landslide（滑坡）causes the water to turn over suddenly,the gases escape in a violent explosion.In the past,no one knew when the gases might explode,so there was no way for the villagers to escape disaster.Now scientists from the United States,France,and Cameroon have found a way to reduce the gas pressure at the bottom of Lake Nyos.They stood a 672-foot plastic pipe in the middle of the lake,with one end of the pipe near the bottom and the other end in the air.Near the top of the pipe,the team put several holes that could be opened or closed by a computer.Now,when the gas pressure gets too high,the holes are opened and some of the gas-filled water shoots up through the pipe into the air like a fountain.With less pressure,a disastrous explosion is much less likely.However,the scientists are not sure that one pipe will be enough to prevent explosions.They hope to put in others soon and they plan to install a similar pipe and a computer system at Lake Monoun as well.To protect people nearby until all of the pipes are in place,the scientists have installed early warning systems at both lakes.If the gas pressure rises to a dangerous level,computers will set off loud sirens（警 报）and bright lights to warn the people in the villages.In that way,they will have time to escape from the dangerous gases.Which of the following statements about Lake Nyos and Lake Monoun is true?A:They were formed in 1984.B:They are at the top of two active volcanoes.C:They are not like most other crater lakes.D:Water in them turns over regularly.
考题
The largest lake in Britain is( ). A.the Lake Neagh
B.Windermere Water
C.Coniston Water
D.the Lake District
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Lake公司在一个高度劳动密集型的环境中，为电子行业生产专门的配件。Arc电子公司要求Lake为上月替Arc做的那种配件报价。上次的订单是80个，需要120直接人工小时来生产。Arc现在需要240各配件。Lake在所有的批次上经历80%的学习曲线。Lake完成这240个配件需要多少直接人工小时（）。A、307.2B、256.0C、187.2D、288.0
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单选题Since 1960, the fast-growing town of Hotstone, Arizona, has drawn water from the Gray River, which feeds Lake Mudfish. If the town’s water use continues to grow at its present rate, in about 20 years the water level of Lake Mudfish will inevitably decrease to the point that it can no longer support its biologically fragile population of fish. The prediction above is based on which of the following assumptions?A
As the town’s water requirements grow, it will not be able to meet those requirements by drawing on water sources other than the Gray River.B
Since 1960, the lake’s population of fish has become more biologically fragile.C
The amount of water that the lake loses to evaporation each year will increase over the next two decades.D
There are multiple sources of water besides the Gray River that feed into Lake Mudfish.E
The town of Hotstone will be able to reverse its trend of increasing water use if it implements an aggressive water conservation program.
考题
单选题The largest lake in the British Isles is（）.A
Loch LomondB
Loch NeaghC
WindermereD
Ullswater
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单选题曲流河相沉积亚相包括（）A
河床亚相、堤岸亚相、河漫亚相、牛轭湖亚相B
河床亚相、天然堤亚相、河漫亚相、牛轭湖亚相C
河床亚相、堤岸亚相、边滩亚相、牛轭湖亚相D
河道亚相、堤岸亚相、漫流亚相、决口扇亚相
考题
单选题Which of the following is the best version of the underlined portions of sentences 10 and 11 (reproduced below)?For instance, one candidate might want to eliminate environmental regulations so his industrial supporters can get richer. But you have asthma that is affected by the pollution or you'd rather not swim in a lake that has become polluted because of it.A
(as it is now)B
for the financial benefit of his industrial supporters, but to the detriment of your asthma and your favorite swimming lake, which are harmed by pollution.C
for his industrial supporters' wealth, but you have asthma and your favorite swim- ming lake is getting worse because of pollution.D
for his industrial supporters' wealth, but not for your asthma and your favorite swimming lake is harmed by pollution.E
for the financial benefit of his industrial supporters, but to the detriment of your asthma and your favorite swimming lake are harmed by pollution.
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单选题Which of the following describes one of the apartments the speaker has seen?A
A railway on one side and a lake on the other.B
A busy road on one side and a lake on the other.C
A busy road on one side and a railway on the other.
考题
单选题The Niagara Falls is located on the US and Canadian boundary between Lake _____ and Lake _____.A
Superior; HuronB
Michigan; HuronC
Huron; ErieD
Erie; Ontario
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