2. 外语
  3. 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

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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