The top leaders of the two countries are holding talks in a friendly .
Aatmosphere
B. state
C. situation
Dphenomenon
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(答案→)A. atmosphere
B. state
C. situation
D. phenomenon
解析：考查名词辨析。A气氛 ；B状态，一般指精神状态或者社会地位；C情况，状况，指事态 ；D现象，多指某地区或时期的现象 根据句意，两国领导人在和谐友好的氛围中展开会谈。如：Even more important to me, however, is the positive, upbeat atmosphere.然而，对我而言更重要的是其中积极、乐观的气氛。故选A。