单项选择题

A．Buy a racing bicycle.
B．Replace the tires on his bicycle.
C．Buying a used bicycle.
D．Sell his old bicycle to the shop.
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单项选择题
A．Hop carefully.B．Walk heavily.C．Float through the air.D．Ride in a spaceship.
A．Hop carefully.
B．Walk heavily.
C．Float through the air.
D．Ride in a spaceship.
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