14．Heavy smog blankets Beijing．     ，city authorities start using its new smog warning system．（　�。�
A．In turnB．In  timeC．In  responseD．In  return

分析 霧霾籠罩著北京．作為回應(yīng)，城市當(dāng)局開(kāi)始采用新的霧霾預(yù)警系統(tǒng)．

解答 答案C
A選項(xiàng)意為"反過(guò)來(lái)，輪流"；B選項(xiàng)意為"及時(shí)，遲早，最后"；C選項(xiàng)意為"作為回應(yīng)，作為答復(fù)"．根據(jù)句意可知，城市當(dāng)局開(kāi)始采用新的霧霾預(yù)警系統(tǒng)，是對(duì)"霧霾籠罩著北京．"的回應(yīng)，故選C．

點(diǎn)評(píng) 本題考查介詞短語(yǔ)辨析，做題時(shí)要根據(jù)介詞短語(yǔ)的意思．結(jié)合句意，選出最佳答案．

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