文档介绍：2022-2022学年高中英语Unit2SailingtheoceansUsingLanguage课时跟踪训练新人教版选修9
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Unit 2 Sailing the oceans Using Lan
When a diver is under great pressure, his blood takes in some of the gases he he rises to surface, the water pressure becomes the diver rises too quickly to the water surface, the gases in his blood will not disappear, instead, they form diver is then likely to be suffering from the bends (潜水员病)．The bends can cause a diver to double up in the diver does not take certain measures to protect himself, they can even kill him.
1．On the whole, this passage is about________.
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A．special mixtures of gases in deep sea
B．the problems man faces in deep­sea diving
C．air pressure under the surface of sea water
D．a kind of illness that man suffers in the sea
解析：选B 主旨大意题。本文开始指出探索海底世界是人类的一个梦想，但是要使梦想成真，人类需要克服许多困难。文章以大局部篇幅说出了人类深海探索所面临的问题。因此B项最能概括大意。
2．A diver's body in deep water________.
A．is under great pressure
B．is just like that of a fish
C．suffers from the bends
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D．weighs very little
解析：选A 细节理解题。从第三段最后一句可知答案。
3．The passage does not say so, but it makes you think that________.
A．deep­sea divers should be in good health
B．divers explore the deep sea only for treasure
C．diving under the water too quickly causes a kind of illness
D．there is a special mixture of gases under the sea
解析：选A 推理判断题。从最后两段可看出，人类潜到深海会身受海水的巨大压力；并容易导致潜水病。因此这是一种带有危险性的职业。我们可以推断，潜水员应该身体强健。故A选项正确。
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4．Why does a diver get the bends?
A．He tries to do exercises under the water.
B．His diving suit weighs too much.
C．He comes to the surface too quickly.
D．The air in his blood is used up.
解析：选C 细节理解题。从最后一段第三、四句可知答案。
B
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