He looked at those jewels one after another and seemed to show no interest in any one of t

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(答案→)A. casually
B. greedily
C. confidentially
D. attentively
解析：考查副词：A. casually随意地，B. greedily贪婪地，C. confidentially自信地，D. attentively专心地，句意：他们随意的一个接一个的看着珠宝，好像为任何一个都不感兴趣。选A。