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 30000people．

（36）___The outer wall of the harbor 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-meter high outer wall．The flats would all face inwards．（37）___The glass would be specially made and colored to control the heat and strong light from the sun．The planners called this water the lake．

（8）___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．（39）___

People living in the city could move around on small boats dnven by electricity．（40）___ There would be platforms outside the main wall for ships bringing supplies．People could also travel to the mainknd by molorboat or water plane．

A．Fresh water is supplied to the city．

B．TTie city was away from the mainland．

C．And they would be made of concrete and glass．

D．The suggestion was to shape the city like a harbor．

E．The water inside this man-made haAor would be calm．

F．It will take the salt out of sea water and turn it into fresh water．

G．Thus there would be no air pollution from the burning of petrol．