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

A.turn downB.break downC.turn outD.break out

B

解析试题分析:句意为:在灾难中当无线网络发生故障时,老式的电话就很重要了。turn down减小,关小,拒绝;break down 发生故障,身体跨了;turn out 结果是,证明是;break out 爆发。故答案为B。
考点: 考查动词短语的用法。

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