The two parties held the talk in a friendly and reached an agreement.A. atmosphereB. stat

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(答案→)A. atmosphere
B. state
C. situation
D. phenomenon
解析：atmosphere意为“气氛；氛围”；state意为“状态”；situation意为“情形；形势”；phenomenon意为“现象”。由句意可知，会谈应该是在友好的气氛中进行，故A项正确。