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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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
单项选择题
In moral matters, parents should ______.
A．observe the rules themselves
B．be aware of the marked difference between adults and children
C．forbid things which have no foundation in morality
D．consistently ensure the security of their children.
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