题目

The sign reads “In case of_________fire，break the glass and push_________red button”. A./；a                   B./；the                C.an;a                   D.a;a 答案：B 解析: fire此处是不可数名词，表示一个概念；“in case of +表概念的抽象名词”是固定习语；the red button 区别于the green button 或the yellow button表示特指的某个东西。

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