Old-fashioned phones matter when wireles...

Old-fashioned phones matter when wireless networks __________ in disasters.

A. break out B. break up

C. break in D. break down

D 【解析】试题分析：考查动词短语辨析。句意：当无线网络因灾害而出故障时，老式的电话就显得尤为重要了。A爆发，突然发生；B结束，破碎，解散(使)痛苦，发笑；C打断，闯入，开始工作；D失败，损坏，出故障，身体垮掉。这里指通讯网络出故障，故选D。考点：考查动词短语辨析

考点分析：

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