单项选择题

A．How bones help the body move.
B．How bones continuously repair themselves.
C．The chemical composition of human bones.
D．Two different types of bones in the human body.
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单项选择题
A．They didn’t care.B．They hated it.C．They loved it.D．They have mixed feelings.
A．They didn’t care.
B．They hated it.
C．They loved it.
D．They have mixed feelings.
填空题
You can make the best of exercise by integrating some form of exercise into ______.
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