【題目】When an earthquake happens，I think the most important safety ________ is to keep calm.

A. rule B. condition C. problem

【答案】A

【解析】試題分析：句意：當(dāng)?shù)卣鸢l(fā)生時(shí)，我認(rèn)為最重要的安全規(guī)則是保持冷靜。A規(guī)則；B狀況；C問題。由此判斷句子中缺少"規(guī)則"一詞，故答案為A．

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