单项选择题

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

A．Student and professor.
B．Athlete and coach.
C．Client and lawyer.
D．Patient and doctor.

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The primary purpose of this article is to instruct the reader to ______.

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