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

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

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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 rebuilt, 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 earth quakes 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 bout earthquakes.
【C2】
选项 A、searching
B、researching
C、studying
D、on working
答案C
解析 spend some time (in) doing sth．为固定搭配，即在某方面花费时间，in 后跟动名词形式，故排除D项；search 寻找，常用搭配为：search sb．／some place 搜查某人／某处，search for sth．搜寻某物，search into sth．探究，调查；research 研究，research into a problem 研究问题；study 研究，学习，其后可直接跟宾语。
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