2. 外语
  3. Most small earthquakes which cause very slight______can only be detected with the help of sophisticated instruments.

Most small earthquakes which cause very slight______can only be detected with the help of sophisticated instruments.

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问题 Most small earthquakes which cause very slight______can only be detected with the help of sophisticated instruments.
选项 A、signals
B、rotations
C、passages
D、vibrations
答案D
解析 名词词义辨析。空格填入的名词要与主语earthquakes，谓语cause搭配。选项中，vibrations(震动；动摇)符合句意，地震能引起的只能是震动，而不能是信号、转动或通道。故答案为D。
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