In communication, a smile is usually _____ strong sign of a friendly and _____ open attitude.
A. the; /
 B. a; an
 C. a; /
 D. the; an
C
考查冠詞。語境為：在交流中，微笑只是友好的符號和開放的態(tài)度之一，表泛指，所以用不定冠詞。
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