【題目】Old-fashioned phones matter when wireless networks break ____ in disasters.

A. out B. down

C. in D. up

【答案】B

【解析】

考查動詞短語辨析。句意：當(dāng)無線網(wǎng)絡(luò)出故障時，老式手機(jī)至關(guān)重要。分析選項（break out戰(zhàn)爭、打斗等不愉快事件）突然爆發(fā)；break down失敗，出故障；拋錨，停止運轉(zhuǎn)；break in闖入，插嘴； break up分解，破裂，終止。分析選項可知B符合題意，故選B。

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