Question

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

A. the; /

B. a; an

C. a; /

D. the; an

Answer 1

C

考查冠词。语境为：在交流中，微笑只是友好的符号和开放的态度之一，表泛指，所以用不定冠词。