Two different types of bones in the human body．,How bon-找考题网

单项选择题

A．Two different types of bones in the human body.
B．How bones help the body move.
C．How bones continuously repair themselves.
D．The chemical composition of human bones.

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单项选择题

The Pacific is on the east of the North American continent.

A．Y
B．N
C．NG

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