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
A．Energy conservation.B．A new kind of transportation.C．Strip cities.D．Advantages o air transportation over rail roads.
A．Energy conservation.
B．A new kind of transportation.
C．Strip cities.
D．Advantages o air transportation over rail roads.
单项选择题
A．She felt proud.B．She felt satisfied.C．She felt delighted.D．She felt surprised.
A．She felt proud.
B．She felt satisfied.
C．She felt delighted.
D．She felt surprised.
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