Old-fashioned phones matter when wireless networks _____ in disasters.
A．turn downB．break downC．turn outD．break out
B

試題分析：句意為：在災(zāi)難中當(dāng)無線網(wǎng)絡(luò)發(fā)生故障時(shí)，老式的電話就很重要了。turn down減小，關(guān)小，拒絕；break down 發(fā)生故障，身體跨了；turn out 結(jié)果是，證明是；break out 爆發(fā)。故答案為B。
考點(diǎn): 考查動(dòng)詞短語的用法。
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