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

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

出自：四川民族学院大学英语A卷

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