第23题: [单项选择]Where are they talking [A] At a cinema. [B] In a post office. [C] At a bank. 参考答案:B 答案解析:[听力原文] W: Good morning, can I help you M: Yes, I’ d like to send this letter by airmail.
A. by accident B. at random C. on occasion D. by chance 参考答案:B 答案解析:[试题分析] 介词短语辨析题。 [详细解答] at random意为“随便地,任意地”。by accident和by chance意为“偶然地.无意中”。on occasion意为“间或,有时”