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单选题
The phrase “this element of the unknown” (Paragraph 3) refers to ______.
A

the extension of earthquake zones

B

the percentage of earthquake occurrences

C

when and where earthquakes may occur

D

what big damage earthquakes may cause


参考答案

参考解析
解析:
此题应该结合上下文来看,先提到“they may,however,happen anywhere at any time. ”,承接上文又说到现在已经可以对地震预测。所以这里说的不确定性也是指地震发生的时间和地点。A和B选项都不全面。故选c。
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