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One answer to the questions of land shortage was suggested by a committee some years ago. A city was to be built at sea, housing

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问题     One answer to the questions of land shortage was suggested by a committee some years ago. A city was to be built at sea, housing 30 000 people.
    The suggestion was to shape the city like a harbour. The outer wall of the harbour would stand on steel columns resting on the sea-bed. Naturally this could only be where the water was fairly shallow. The people would live in flats in the fifty-metre high outer wall. The flats would all face inwards, and would be made of concrete and glass. The glass would be specially made and coloured to control the heat and strong light from the sun.
    The water inside this man-made harbour would be calm. The planners called this water the lake. On it would be floating islands carrying more buildings; a hospital, two theaters, a museum, an art exhibition hall and a church. On one of the islands would be a special plant, to take the salt out of sea water and turn it into fresh water.
    People living in the city could move around on small boats driven by electricity , so there would be no air pollution from the burning of petrol. There would be platforms outside the main wall for ships bringing supplies. People could also travel to the mainland by motorboat or water plane.
There would be no air pollution to this city because ______.
选项 A、there was a special plant to treat the polluted air
B、the city was away from the mainland
C、people in the city did not burn oil or coal
D、vehicles there were powered by electricity
答案D
解析 本题为细节辨析题。文中提到，城中的居民出行都是乘坐小船，这种小船是由电力驱动的，因此不会造成空气污染。
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