单项选择题

A．The library is in the busiest part of the city.
B．The library has grass and trees around it.
C．The roof of the Main Reading Room is 41 feet high.
D．Its rooms are very large.
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单项选择题
A．The helicopter can fly forwards, backwards, up, down, and sideways.B．The helicopter can hover in the air.C．The helicopter can land and take off from a flat roof.D．The helicopter has a single-bladed rotor on its top.
A．The helicopter can fly forwards, backwards, up, down, and sideways.
B．The helicopter can hover in the air.
C．The helicopter can land and take off from a flat roof.
D．The helicopter has a single-bladed rotor on its top.
单项选择题
A．Minerals.B．Chemical pollutants.C．Salt.D．Germs.
A．Minerals.
B．Chemical pollutants.
C．Salt.
D．Germs.
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