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

A.the;不填

B.a;an

C.a;不填

D.the;an

124.First impressions are the most lasting.After all,you never get ____ second chance to make ____ first impression.

A.a;the

B.the;the

C.a;a

D.the;a

123.答案是C，

考查冠词的用法；a用在可数名词sign前，表示泛指；而friendly and attitude并列修饰attitude。

124.答案是A，

第一空格a second chance=another chance又一次机会；而the first impression 第一印象。