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题目内容
（华北水利水电大学英语）
Thephrase“thiselementoftheunknown”(Paragraph3)refersto___________.（）
·theextensionofearthquakezones
·theextensionofearthquakezones
·whenandwhereearthquakesmayoccur
·whatbigdamageearthquakesmaycause
·theextensionofearthquakezones
·theextensionofearthquakezones
·whenandwhereearthquakesmayoccur
·whatbigdamageearthquakesmaycause
参考答案
