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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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