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．can be stopped if proper measures are taken
D．is quickly changing the map of England
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单项选择题
It is not feasible to build sea defenses to protect against erosion because ______
A．house agents along the coast do not support the idea
B．it is too costly and will endanger neighboring areas
C．the government is too slow in taking action
D．they will be easily knocked down by waves and currents
单项选择题
It can be inferred from the passage that ______
A．new radio devices should be developed for tracking the endangered blue whales
B．blue whales are no longer endangered with the use of the new listening system
C．opinions differ as to whether civilian scientists should be allowed to use military technology
D．military technology has great potential in d 'civilian use
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