2. 外语
  3. What effect does excessive positive ions have on some people? By observing the behavior of animals, scientists may be able to _

What effect does excessive positive ions have on some people? By observing the behavior of animals, scientists may be able to _

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问题 What effect does excessive positive ions have on some people?
By observing the behavior of animals, scientists may be able to ______.
选项 A、prevent disasters
B、organize groups of people
C、predict earthquakes
D、control areas of California
答案C
解析 文章第一段第五句提到，正离子过剩出现于灾难发生前夕。第二段第二、三句提到动物这时会有异常反应，所以科学家已经开始观察动物，希望能预测灾难(in an effort to foresee such disasters)，所以C正确。观察动物并不能阻止灾难发生，因此A错误。第二段第三句提到科学家组织志愿者对动物进行观察的目的是预测灾难，LB表达的意思是通过观察动物行为，科学家可以组织人员，这显然是倒置了因果关系。第二段第三句提到加州，但只是说如果能预测出诸如这种地方的灾难就能够提前加以预防，而不是要控制这个地方，故排除D。
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大学英语四级

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