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

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

A. the; / B. a; an C. a; /　 D. the; an

试题答案

解析：选 C。考查冠词。句意为：在交流沟通时，微笑通常是表达友好以及不隐晦的态度的有效身体语言。sign是可数名词单数，此处表示泛指，因此应用不定冠词a；句中a friendly and open同时修饰同一个名词attitude，因此open前面不能再加冠词，故选C。