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．He had psychic powers.B．He was an educated man.C．He went to school at the age of six.D．He died in 1929.
A．He had psychic powers.
B．He was an educated man.
C．He went to school at the age of six.
D．He died in 1929.
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.
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