Heavy smog blankets Beijing．        ,city authorities start using its new smog warning system．
A．In turnB．In time C．In responseD．In return
C               
             
試題分析：考查介詞短語辨析。A．In turn 輪流；B．In  time及時；C． In  response作出回應；D． In  return作為報答。句意：嚴重的霧霾覆蓋北京，作為回應，城市當局可使用新的霧霾警告系統(tǒng)。根據(jù)句意，上文提到霧霾嚴重，故作出回應，所以選C項。          
考點 : 考查介詞短語辨析
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