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,0  【21】______   their horror, that their gardens had disappeared overnight. The sea had eaten into the soft limestone cliffs  【22】______   their gardens had been built. While experts were studying the problem, the hotel and several houses disappeared altogether,  【23】______   down the cliff and into the sea.
   Erosion of the white cliffs  【24】______   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  【25】______   as the sea has crept farther and farther inland. Experts have studied the areas most  【26】______   and have drawn up a map for  【27】______   people,  【28】______   the year in which their homes will be  【29】______   up by the hungry sea.
     【30】______   owners have  【31】______   the Government to erect sea defenses to protect their homes. Government surveyors have pointed out that in most cases, this is impossible. New sea walls would  【32】______   hundreds of millions of pounds and would  【33】______   make the waves and currents go further along the coast,  【34】______   the problem from one area to  【35】______  . The danger is  【36】______   to continue, they say,  【37】______   the waves reach an inland area of hard rock which will not be eaten  【38】______   limestone is.  【39】______   , if you want to buy a cheap house with an   【40】______   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.  
【40】

选项 A、uncertain
B、unstable
C、unreal
D、improper

答案A

解析
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