单项选择题

This article shows that ______.

A．some people are trying to solve their waste problems
B．the government is not concerned with the problem of wastes
C．recovered materials won't be able to compete with new materials
D．citizens will unwillingly pay the costs of changing the waste system

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单项选择题

There would be no air pollution to this city because ______.

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

单项选择题

What was suggested about the construction of a new city at sea

A．The city was to be designed together with a harbour.
B．The walls around the city would be made of steel and glass.
C．The buildings of the city would rest on a floating island.
D．The people would live in flats made of coloured glass.