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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.
The purpose of the writer is ______.
选项 A、to suggest how a new type of harbour could be built at sea
B、to give an account of a new-type city
C、to draw people’s attention to the problem of air pollution
D、to introduce a new way of constructing harbour-cities
答案B
解析 本题为主旨归纳题。全篇介绍了一个通过建设浮岛城市来解决土地缺乏问题的想法，并详细描述了该浮岛城市的样式、功能设施等。所以，本文描述了一种新型城市。 A 选项“介绍如何在海上建设一种新型海港”，根据文章，需要建设的不是海港而是城市。C 选项“引起人们对于污染问题的关注”，与文章主题不符。D 选项“介绍一种建设海港城市的新方法”，由文章可知，要建设海中的浮岛城市，而非依托原有的海港建设海港城市。
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