单项选择题

Man cannot prevent the world from being polluted because_________.

A．people use too many man-made materials
B．the pupulation of the world is increasing faster
C．we are producing more cars, trucks and buses
D．we have more and more industry.

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热门试题

单项选择题

What does the writer really want to say in the passage

A．As industry is growing fast, pollution is the natural result.
B．It's time we did something to reduce pollution.
C．We should control the speed of the development to stop pollution.
D．With the development of technology, pollution has become a serious problem.

单项选择题

The waterfall_______the rocks.

A．wears down
B．wears off
C．wears away
D．wears out