单项选择题

The experts' study on the problem of erosion can ______.

A．lead to its eventual solution
B．provide an effective way to slow it down
C．help to prevent it from worsening
D．warn people whose homes are in danger

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单项选择题

It is not feasible to build sea defenses to protect against erosion because ______.

A．it is too costly and will endanger neighbouring areas
B．the government is too slow in taking action
C．they will be easily knocked down by waves and currents
D．house agents along the coast do not support the idea

单项选择题

The erosion of the white cliffs in the south of England ______.

A．will soon become a problem for people living in central England
B．has now become a threat to the local residents
C．is quickly changing the map of England
D．can be stopped if proper measures are taken