The UN Climate Change Conference in Copenhagen was held in a tense ______ due to lack of deep understanding.A.atmosphereB.stateC.situationD.phenomenon
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A解析词义辨析。atmosphere 气氛，空气；state 国家，情形； situation情况，形势；phenomenon现象，奇迹。句意：由于缺乏深刻的理解，联合国气候变化会议在一种紧张的气氛中与哥本哈根召开。故选A。