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.
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单项选择题
A．He put it back on the ground.B．He put it into his own pocket.C．He threw it into a trashcan.D．He gave it to the police.
A．He put it back on the ground.
B．He put it into his own pocket.
C．He threw it into a trashcan.
D．He gave it to the police.
填空题
O
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