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(2013·福建，28)Old－fashioned phones matter when wireless networks ________ in disasters.
A．turn downB．turn out
C．break downD．break out
D
考查動詞短語辨析。A項“調(diào)小，拒絕”；B項“結(jié)果證明……”；C項“出故障，分解”；D項“爆發(fā)”。句意：當發(fā)生災(zāi)難無線網(wǎng)絡(luò)無法用的時候，老式的電話就有作用了。故答案為C。
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