People living on part of the south coast of England face a serious problem. In 1993 ,the owners of a large hotel and of several

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问题     People living on part 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 cliffs 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 (侵蚀) 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 abandoned as the sea has crept 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 erect sea defenses to protect their homes.
     Government surveyors have pointed out that in most cases, his 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 the problem from one area to another. The danger is likely to continue, they say, until the waves reach an inland 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.
It is not feasible to build sea defenses to protect against erosion because______.

选项 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

答案B

解析 文章第三段中提到“New sea walls…from one area to another”。由此可以看出,建立防护墙不可行的主要原因有两个:一是过于昂贵;一是海浪和海潮会沿着防护墙继续侵袭,只是从一个地方换到了另一个地方。所以B 是正确选项。A “沿海岸线的房屋代理人不支持这一计划”;C “政府采取行动缓慢”;D “它们会轻易的被海浪和海潮推翻”文章中都没有体现。
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