根據(jù)短文內容，從短文后的選項中選出能填入空白處的最佳選項。選項中有兩項為多余選項。
The sea has always interested man. From it he can get food, minerals and treasure.  小題1: But he couldn’t go far beneath its surface.
 小題2: 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.
A diver who wants to stay under water for more than a few minutes must breathe air or a special mixture of gases.  小題3: 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. 小題4: .
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（潛水員病）. The bends can cause a diver to double up in pain.  小題5:  
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.

小題1:C
小題2:G
小題3:E
小題4:A
小題5:D

試題分析：本文介紹了在幾千年以前，人類就可以在海上航行，但是卻無法潛入海下很遠，人類很想探索深海，但人類不是魚，潛入深海面臨很多危險和困難。在深海中，大量的水擠在潛水員身上，他的身體承受巨大的壓力，上岸后，可能會得潛水員病，潛水員病甚至會致命
小題1:根據(jù)But he couldn’t go far beneath its surface. 可知這里想說在幾千年以前，人類就可以在海上航行，但是卻無法潛入海下很遠，故選C。
小題2:根據(jù)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. 可知這里想說人類想要探索深海，故選G。
小題3:根據(jù)He can carry a tank of air on his back and breathe through a hose and a mouthpiece.可知這里想說他可以穿潛水服，從上面向下輸送氧氣，故選E。
小題4:根據(jù)Tons of water pushes against a diver deep in the sea.可知這里想說在深海中，大量的水擠在潛水員身上，他的身體承受巨大的壓力，故選A。
小題4:根據(jù)The diver is then suffering from the bends（潛水員�。�. The bends can cause a diver to double up in pain. 可知這里想說潛水員病甚至會致命，故選D
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