◎ 题干
In communication, a smile is usually _____ strong sign of a friendly and _____ open attitude.

[     ]

A. the, /
B. a, an
C. a, /
D. the, an
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“In communication, a smile is usually _____ strong sign of a friendly and _____ open attitude. [ ]A. the, / B. a, an C. a, / D. the, an …”主要考查了你对  【不定冠词】【零冠词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。