Question

Old­fashioned phones matter when wireless networks ________ in disasters.(2013·福建，28)

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

Answer 1

C
解析　句意为：当无线网络在灾难中出故障时，老式电话起很大作用。turn down关小，拒绝；turn out结果是；break down崩溃，损坏；break out(战争、火灾等)爆发。由句意知选项C正确。