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【题目】Old-fashioned phones matter when wireless networks break ____ in disasters.

A. out B. down

C. in D. up

【答案】B

【解析】

考查动词短语辨析。句意:当无线网络出故障时,老式手机至关重要分析选项(break out战争、打斗等不愉快事件)突然爆发;break down失败,出故障;抛锚停止运转;break in闯入,插嘴; break up分解,破裂,终止。分析选项可知B符合题意,故选B。

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