单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Teacher and student.
B．Doctor and patient.
C．Lawyer and client.
D．Boss and secretary.

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For some people, it may be better______.

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。