单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．How bones continuously repair themselves.
B．The chemical composition of human bones.
C．Two different types of bones in the human body.
D．How bones help the body move.

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A．1:30.B．9:30.C．11:00.D．10:30.

A．1:30.
B．9:30.
C．11:00.
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A．Husband and wife.B．Guest and host.C．Australian and American.D．Teacher and student.

A．Husband and wife.
B．Guest and host.
C．Australian and American.
D．Teacher and student.

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。

Questions 19 to 22 are based on the conversation you have just heard.