题目内容
much of the world still remains to be studied. The two men went down seven miles to the bottom of the
Pacific Ocean inside a small steel ball to find out if there are any ocean currents (水流) or signs of life.
It was necessary to set out early, so that the ball would come to the surface in daylight, and be easily
found by the mother ship which would be waiting for it. The divers began preparations early in the morning
and soon afterwards, when all was ready, the steel ball disappeared under the surface of the water.
The divers felt as if they were going down steps as they passed through warm and cold layers (层) of
water. In time the temperature dropped to the freezing point. They kept in touch with the mother ship by
telephone telling how they felt. Then, at a depth of 3,000 feet, the telephone stopped working and they were
quite cut off from the outside world. All went well until some four hours later at 30,000 feet, the men were
frightened by a loud, cracking noise. Even the smallest hole in the ball would have meant instant death. Luckily,
though, it was only one of the outer windows that had broken. Soon afterwards, the ball touched the soft
ocean floor raising a big cloud of "dust" made up of small dead sea creatures. Here, powerful lights lit up the
dark water and the men were surprised to see fish swimming just above them quite untroubled by the great
water pressure. But they did not dare to leave the lights on for long, as the heat from them made the water
boil. Quite unexpectedly, the telephone began working again and the faint but clear voices of the divers were
heard on the mother ship seven miles away. After a stay of thirty minutes the men began their journey up,
arriving three hours later, cold and wet through, but none was worse for their experience.
B. if people can stand the severe cold in the great depths
C. if there are steps in the great depths
D. if the telephone works well in the great depths
B. they could see at the bottom of the ocean
C. they could avoid the cold at night
D. they could stay long at the bottom
B. stopped working at a depth of 3,000 feet and began working again after they reached the bottom
C. stopped working at a depth of 3,000 feet and began working again at 30,000 feet
D. stopped working at a depth of 3,000 feet and began working again when they returned to the same depth
B. fish were swimming as freely as they do near the surface
C. fish were not swimming freely in the dark water
D. fish were not swimming freely under the high water pressure
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