The UN Climate Change Conference in Copenhagen was held in a tense due to lack of deep un

问题补充：

The UN Climate Change Conference in Copenhagen was held in a tense due to lack of deep understanding.

A. atmosphere

B. state

C. situation

D. phenomenon

答案：

(答案→)A. atmosphere

B. state

C. situation

D. phenomenon

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。