单选题The phrase “this element of the unknown” (Paragraph 3) refers to ______.Athe extension of earthquake zonesBthe percentage of earthquake occurrencesCwhen and where earthquakes may occurDwhat big damage earthquakes may cause
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。
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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