单选题 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 expect it to happen so soon.
【正确答案】 C
【答案解析】[解析] 本题空格处是说里氏震级7级以上的地震每120年就会突发一次。四个选项中， A项appeai-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”；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。