单项选择题

From the context, we can see that a lever is a tool which can be used to ______ .

A．remove the wheel from the bike
B．replace the wheel on the bike
C．push the tyre back into position
D．take out the inner tube
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单项选择题
This passage is intended for someone who ______ .
A．learn to ride a bicycle
B．has a flat tyre
C．buys a new tyre
D．travels by bike
单项选择题
The passage implies that if the air leakage came from the valve, ______ .
A．there is no need to remove the inner tube
B．you could solve the problem by putting spit on it
C．you would still need to examine the inner tube
D．there would be no way to solve the problem
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