2. 外语
  3. Nowadays groups of scientific workers, often【C1】______ by their governments, spend their time【C2】______ the occurrence of earthq

Nowadays groups of scientific workers, often【C1】______ by their governments, spend their time【C2】______ the occurrence of earthq

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问题      Nowadays groups of scientific workers, often【C1】______ by their governments, spend their time【C2】______ the occurrence of earthquakes. It is very likely that they will be able to【C3】______  earthquakes or influence the direction of their movements,【C4】______ determined by events far below the surface of the earth. But the facts they report and the theories【C5】______ by those facts may enable scientists to【C6】______ the centers of future earth quakes and even【C7】______ the time of their【C8】______ . It is only when the【C9】______ of  events that we call an earthquake can be seen as a pattern that【C10】______ can be made. Part of its pattern is external and visible, or capable of being【C11】______ by sensitive instruments above the earth’s surface.
   Scientists and engineers studied the shock waves of the San Francisco earthquake.  The city was rebuilt and new features were【C12】 ______ to strengthen buildings and【C13】______ a constant water supply【C14】______ the event of another earthquake.  Large underground tanks were constructed to supply water if【C15】______ supplies could not be tapped.  Special measures were【C16】______ to prevent fires, which often do more damage than earth quakes themselves. The San Francisco earthquake【C17】______ scientists with valuable information. Since the effects of the break were【C18】______ 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 a bout earthquakes.
【C13】
选项 A、defend
B、maintain
C、keep on
D、safeguard
答案B
解析 此题考查动词词义。该空应填人的动词是该句目的状语的一部分，加固建筑物和……水源不断：A项defend“保卫”；B项maintain“保持；维持”；C项keep on“继续(keep on doing sth．)”；D项safe guard“保护；防卫”；可见B项符合题意。
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