People living on parts of the south coast of England face a serious problem. In 1993, the owners of a large hotel and of several houses discovered, to their horror, that their gardens had disappeared overnight. The sea had eaten into the soft limestone（石灰石）cliffs（崖）on which they had been built. While experts were studying the problem, the hotel and several houses disappeared altogether, sliding down the cliff and into the sea.

Erosion（侵蝕）of the white cliffs along the south coast of England has always been a problem but it has become more serious in recent years. Dozens of homes have had to be given up as the sea has crept（蔓延）farther and farther inland. Experts have studied the areas most affected and have drawn up a map for local people, forecasting the year in which their homes will be swallowed up by the hungry sea.

Angry owners have called on the government to set up sea defenses to protect their homes. Government officials have pointed out that in most cases, this is impossible. New sea walls would cost hundreds of millions of pounds and would merely make the waves and currents go further along the coast, shifting（轉(zhuǎn)移）the problem from one area to another. The danger is likely to continue, they say, until the waves reach an island area of hard rock which will not be eaten as limestone is. Meanwhile, if you want to buy a cheap house with an uncertain future, apply to a house agent in one of the threatened areas on the south coast of England. You can get a house for a knockdown price but it may turn out to be a knockdown home.

1．What is the cause of the problem that people living on parts of the south coast of England face?

       A．The rising of the sea level．

       B．They spent millions of pounds to set up sea defenses but they failed.

       C．The washing-away of limestone cliffs．

       D．The disappearance of hotels, houses and gardens．

2．The erosion of the white cliffs in the south of England ___________________．

       A．will soon become a problem for people living in England

       B．has now become a serious problem to the local people

       C．can be stopped if proper measures are taken

       D．is quickly changing the map of England

3．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

4．It is impossible to build sea defenses to protect against erosion because _____________．

       A．house agents along the coast do not support the idea

       B．they will be easily knocked down by waves and currents

       C．the government is too slow in taking action

       D．it is too costly and will endanger neighbouring areas

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