单项选择题

Questions 22 to 25 are based on the conversation you have just heard.

A．It can be even higher.
B．It’s very good.
C．It’s the same as that of post office.
D．It varies with the person’s experience.

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单项选择题

Questions 22 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。