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  3. 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

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.
The suggestion made by the committee is to solve the problem that ______.
选项 A、there is not enough space for building cities on land
B、land transportation has become increasingly difficult
C、there are too many people on land
D、present cities are heavily polluted by cars and other vehicles
答案A
解析 本题为细节辨析题。文章第一句话说“几年前，一个委员会就土地缺乏问题提出了一个解决方案”，接着提出了建设浮岛城市的想法。因此，建浮岛城市的目的就是为了解决土地缺乏的问题。
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