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.
How would fresh water be supplied to the city?

选项 A、By treating sea water.
B、By getting it from the surrounding islands.
C、By building a small lake of fresh water inside the city.
D、By transporting it from the mainland.

答案A

解析 本题为细节辨析题。文中提到,城市里要建一座工厂,该工厂能够把海水转化为淡水。因此,城里淡水的供应是要靠对海水进行处理。
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