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题目内容
（华北水利水电大学英语）
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
·the extensioof earthquake zones
·the extensioof earthquake zones
·wheand where earthquakes may occur
·what big damage earthquakes may cause
参考答案
