A．His body is under great pressure.

　　B．Scientists are trying to find more about the sea.

　　C．For thousands years, he could sail on it.

　　D．They can even kill him.

　　E．He can wear a diving suit and have air pumped to him from above.

　　F．The water pressure can cause a diver to breathe with difficulty.

　　G．Man wants to explore deep into the sea.

　　答案与解析

　　本文介绍了在几千年以前，人类就可以在海上航行，但是却无法潜入海下很远，人类很想探索深海，但人类不是鱼，潜入深海面临很多危险和困难。在深海中，大量的水挤在潜水员身上，他的身体承受巨大的压力，上岸后，可能会得潜水员病，潜水员病甚至会致命。

　　1．C　根据 But he couldn't go far beneath its surface. 可知这里想说在几千年以前，人类就可以在海上航行，但是却无法潜入海下很远，故选C。

　　2．G　根据 However, he isn't a fish. Because he must breathe air, 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. 可知这里想说人类想要探索深海，故选G。

　　3．E　根据 He can carry a tank of air on his back and breathe through a hose and a mouthpiece. 可知这里想说他可以穿潜水服，从上面向下输送氧气，故选E。

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