单项选择题

You may find out whether the air is leaking by ______ .

A．drying the inner tube
B．running your fingers over the inside of the tyre
C．removing the wheel from the bike
D．putting your ear to the tube and listen

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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

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