单项选择题

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

A．A teacher and student.
B．An employer and employee.
C．A grandparent and grandchild.
D．Two new friends.

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填空题

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