英语阅读题5小题 第31题 The sea has always interested man.From it he c

英语阅读题5小题
第31题
The sea has always interested man.From it he can get food,minerals,and treasure.For thousands of years,he could sail on it.But he could not go far beneath its surface.
Man wants to explore deep into the sea.However,he is not a fish.Because he must breathe air,he can not stay under the water’s surface for any length of time.To explore deep water,man faces even more dangers and problems.
A diver who wants to stay under water for more than a few minutes must breathe air or a special mixture of gases.He can wear a diving suit and have air pumped to him from above.He can carry a tank of air on its back and breathe through a hose and a mouthpiece.
Water weighs 800 times as much as air.Tons of water pushes against a diver deep in the sea.His body is under great pressure.
When a diver is under great pressure,his blood takes in some of gases he breathes.As he rises to surface,the water pressure becomes less.If the diver rises too quickly,the gases in his blood form bubbles.The diver is then suffering from the bends (潜水员病).The bends can cause a diver to double up in pain.They can even kill him.
1.On the whole,this passage is about _______ .
A、special mixture of gases in deep sea
B、the problems man faces in deep-sea diving
C、air pressure under the surface of sea water
D、a kind of illness that man suffers in the sea
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
D、 weighs very little
3．The passage does not say,but it makes you think that _______ .
A、deep-sea divers should be in good health
B、divers explore the deep sea only for treasure
C、diving under water too quickly causes a kind of illness
D、there is a special mixture of gases under the sea
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.
5．From the passage we can see that _______ .
A、the sea began to interest man in the last few years
B、man is not at home deep in the sea
C、all divers will get the bends sooner or later
D、the air in the seawater will kill a diver if he is not careful

1.B；总的来说,这篇文章主要写的是人类在深海潜水的困难
2.A;倒数第二段最后一句话,His body is under great pressure.B显然不对,C是从深海到浅海或者到达海水表面时才面临的病症,D也不对.
3.A;因为潜水很危险,还会得某些疾病,因此潜水员必须身体健康.B选项文中没有提到,C选项,应该是从深海潜水到浅海这个上升的过程太快,才会引起疾病,D不对,应该是潜水员背的氧气瓶里有特殊的混合气体,而不是海里有.
4.C；最后一段可看出
5.B；A选项,文章第一句话说The sea has always interested man.大海一直给人类带来好处,而不是A选项中所说的最近几年才给人类带来好处,C并不是所有潜水员会早晚会得病,只有在潜水时上升太快的潜水员才会得病,D不是大海中的气体会杀死潜水员,而是他呼吸到的氧气瓶或者氧气泵中的气体在潜水员不小心的时候会杀死潜水员.C、D选项都在最后一段中.