单项选择题

A．To learn how to prevent a bone disease.
B．To understand differences between bone tissue and other tissue.
C．To find out how specialized bone cells have evolved.
D．To create artificial bone tissue.
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单项选择题
A．He was very slow in doing things.B．He is expected to do such a thing.C．He was the right person to do such a thing.D．He would never do such a thing.
A．He was very slow in doing things.
B．He is expected to do such a thing.
C．He was the right person to do such a thing.
D．He would never do such a thing.
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