2. 外语
  3. At present groups of scientific workers, often【C1】______by their governments, spend their time in【C2】______the【C3】______of earth

At present groups of scientific workers, often【C1】______by their governments, spend their time in【C2】______the【C3】______of earth

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问题    At present groups of scientific workers, often【C1】______by their governments, spend their time in【C2】______the【C3】______of earthquakes. It is very【C4】______that they will be able to【C5】______earthquakes or influence the direction of their movements, which are determined by events far below the surface of the earth. But the facts they report and the theories【C6】______by those facts may enable scientists to【C7】______the centers of future earthquakes and even【C8】______the time of their【C9】______. It is only when the【C10】______of events that we call an earthquake can be seen as a pattern that predictions can be made. Part of this pattern is external and【C11】______or capable of being recorded by【C12】______instruments above the earth’s surface. Scientists and engineers studied the【C13】______of the San Francisco earthquake. The city was re built, and new features were【C14】______to strengthen buildings and maintain a【C15】______water supply in the event of another earthquake. The water mains(=main pipes)were fitted with control valves which would enable water to travel by different routes round broken places. Large underground tanks were constructed to supply water if【C16】______supplies could not be tapped. Special measures were【C17】______to prevent fires, which often do more damage than earthquakes themselves. The San Francisco earthquake【C18】______scientists with important information. Since the effects of the break were visible at the surface, scientists could【C19】______what actually happened, and reports of the incident were an important【C20】______to the world’s store of knowledge about earthquakes.  
【C13】
选项 A、efforts
B、afford
C、affects
D、effects
答案D
解析 effect“影响，后果”；选项A、B词义不符；选项C不符语法结构。
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