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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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.
单项选择题
What is the main idea of the second paragraph
A．Parents should be strict with their children.
B．Parental controls reflect only the needs of the parents and the values of the community.
C．Parental restrictions vary, and are not always enforced for the benefit of the children alone.
D．Parents vary in their strictness toward their children for the benefit of parents.
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