Old-fashioned phones matter when wireles...

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

A. turn down B. break down C. turn out D. 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。

考点分析：

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