The phrase “this element of the unknown” (Paragraph 3) refers to ___________.（）<br>·the extensioof earthquake zones<br>·the extensioof earthquake zones<br>·wheand where earthquakes may occur<br>·what big damage earthquakes may cause

The phrase “this element of the unknown” (Paragraph 3) refers to ___________.（）
·the extensioof earthquake zones
·the extensioof earthquake zones
·wheand where earthquakes may occur
·what big damage earthquakes may cause

出自：华北水利水电大学英语

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