Question

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. He must breathe air, so he can't 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 his back and breathe through a nose 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 the 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. 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 mixtures 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.The passage does not say so, but it makes you think that ________.

A. deep 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

3.From the passage we can see that ________.

A. the sea began to interest man a few years ago

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 sea water will kill a diver if he is not careful

 

Answer 1

【答案】

 

1.B

2.A

3.B

【解析】

試題分析：文章介紹了人類從很早就探索海洋，從中獲取吃的，礦物質(zhì)，財富等等，但是很長時間以來，他們只可以航海，但是沒辦法去海洋的下面去，潛水員要去水面以下，就必須帶氧氣瓶，并且水的壓力是很大的，如果下去以后在回來時速度太快，就會有身體上的不適等。

1. B大意理解題。文章的第二自然段人不能在水面以下呆的時間太長，如果去探索深海，會面臨更大的危險。第二自然段講了潛水員去水下的時候要帶氧氣瓶，水的重量是空氣重量的800倍，因此要承擔(dān)很大的壓力。第三自然段是潛水員去水深處時，他的血液會吸收他呼吸的氣體，急速反回時，會有更大的危險。故答案應(yīng)為B。

2.A細節(jié)理解題。文章的第三自然段講述了潛水員要承認(rèn)很大的壓力，血液會吸收他呼吸的氣體，如果返回太快，血液里的氣體會形成氣泡，就會患上減壓病，會承受痛苦，甚至有生命危險，由此可知，運動員身體必須健康。故答案應(yīng)為Ａ．

3.B細節(jié)判斷題。Ａ人類在許多年前就開始探索大海，而第一自然段人類探索大海數(shù)千年了，故Ａ是錯誤的；all divers will get the bends sooner or later所有的潛水員都遲早會患減壓病的，這在文章當(dāng)中是無法反映出的；文章的最后一自然段最后一句話是說減壓病可能會使一個人喪生，不是海水中的空氣，是錯誤的，故Ｂ是正解的，人類在深海是不可能安家的。

【考點】考查科普環(huán)保類文章的閱讀理解。