Old-fashioned phones matter when wireless networks _____in disasters.
A. turn down B. turn out C. break down D. break out
Old-fashioned phones matter when wireless networks _____in disasters.
A. turn down B. turn out C. break down D. break out
C。本题考查动词短语的用法。turn down关小、调低、拒绝；turn out 证明是、结果是、生产；break down分解、发生故障、失败；break out爆发。无线网络会瘫痪，所以选C。
【句意】当无线网络发生灾难性故障的时候，过时的电话变得很重要。