While we plan our railway buildings with a life span of 100 years, we also know that a quake measuring over seven on the Richter

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问题 While we plan our railway buildings with a life span of 100 years, we also know that a quake measuring over seven on the Richter scale might______once in 120 years, though we never expected it to happen so soon.

选项 A、appear
B、develop
C、erupt
D、emerge

答案C

解析 本题空格处是说,里氏7级以上的地震每120年就会突发一次。四个选项中,A项appear的意思是“出现,看来,似乎,公开露面,出版,发表”;B项develop的意思是“发展,发达,发扬,进步”;C项erupt的意思是“爆发”,如Violence has erupted on the streets(大街上突然发生了暴乱);D项emerge的意思是“显现,浮现,暴露,形成”。根据题意,C项为正确答案。
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