单项选择题

A．A new fuel for buses.
B．The causes of air pollution.
C．A way to improve fuel efficiency in buses.
D．Careers in environmental engineering.
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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.
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.
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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