单项选择题

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

A．Serving in the army.
B．Teaching at a high school
C．Doing business with his brother.
D．Doing business with a friend of his.
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单项选择题
A．The speaker’s former classmate.B．The speaker’s Colleague.C．The woman in the photograph.D．The young girl in the photograph.
A．The speaker’s former classmate.
B．The speaker’s Colleague.
C．The woman in the photograph.
D．The young girl in the photograph.
单项选择题
A．To create artificial bone tissue.B．To learn how to prevent a bone disease.C．To find out how specialized bone cells have evolved.D．To understand differences between bone tissue and other tissue.
A．To create artificial bone tissue.
B．To learn how to prevent a bone disease.
C．To find out how specialized bone cells have evolved.
D．To understand differences between bone tissue and other tissue.
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