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.
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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.
填空题
B
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