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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.
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.
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