单项选择题

A．They break down bone tissue.
B．They defend the bone against viruses.
C．They connect the bone to muscle tissue.
D．They prevent oxygen from entering the bone.
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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
A
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