题目内容
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 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 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
(气泡). The diver is then suffering from the bends. The bends can cause a diver to double up in pain. They
can even kill him.
B. the problems a diver faces in deep sea
C. air pressure under the surface of sea water
D. a kind of illness that man suffers in the sea
B. divers explore the deep sea only for treasure
C. there is a special mixture of gases under the sea
D. diving under the water too quickly causes a kind of illness
B. His diving suit weighs too much
C. He comes to the surface too quickly
D. He tries to do exercise under the sea
B. the sea began to interest man in the last few years
C. all divers will get the bends sooner or later
D. the bends may kill a diver
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