单项选择题

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

A．Professor and student.
B．Shop assistant and customer.
C．Librarian and reader.
D．Two friends.

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Riding a bicycle takes concentration, sobriety and a license.

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