Which of the following statements is true according to the passage? The phrase" this element of the unknown" ( paragraph 3 ) re

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问题 Which of the following statements is true according to the passage?
The phrase" this element of the unknown" ( paragraph 3 ) refers to ______.

选项 A、when and where earthquakes may occur
B、the percentage of earthquake occurrences
C、the extension of earthquake zones
D、what big damage earthquakes may cause

答案A

解析 释义题。结合上文来看,上文提到地震可能发生在任何地点任何时间,所以这里所说的不确定性指的是地震发生的时间和地点。故选A。
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