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4. He left immediately the clock struck one.

He left the clock struck one.

4. as soon as

题目来源：全品作业本高中英语选修7新课标人教版 > Unit 3 Under the sea

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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. Too much 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 the 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 the 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 from 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 so,but it makes you think that .

A. deepdivers should be in good health