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Old­fashioned phones matter when wireless networks ________ in disasters.(2013·福建，28)
A．turn downB．turn out
C．break downD．break out
C
解析　句意為：當(dāng)無線網(wǎng)絡(luò)在災(zāi)難中出故障時(shí)，老式電話起很大作用。turn down關(guān)小，拒絕；turn out結(jié)果是；break down崩潰，損壞；break out(戰(zhàn)爭(zhēng)、火災(zāi)等)爆發(fā)。由句意知選項(xiàng)C正確。
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