单项选择题

The experts' study on the problem of erosion can ______

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

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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

单项选择题

The passage is chiefly about ______

A．an effort to protect an endangered marine species
B．the civilian use of a military detection system
C．the exposure of a U.S. Navy top-secret weapon
D．a new way to look into the behavior of blue whales