单项选择题

To see whether there is leak of air, you should first ______ .

A．pump some air into the tube
B．replace the tyre
C．examine the valve
D．check the wheel
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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
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
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