单项选择题

Children have taken over ______.

A．only in America and at present
B．more than in America and at present
C．more than in America and all the time
D．only in America and all the time
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单项选择题
What is the main idea of this passage
A．The differences between point-source pollution and non-point pollution.
B．How to solve the water pollution problem.
C．The different types of water pollution.
D．The measures government takes to control water pollution.
单项选择题
It is implied in the passage that ______.
A．water pollution is the most serious one in all kinds of pollution
B．both point-source and non-point pollution are serious problems
C．point-source pollution is an unimportant problem
D．water pollution can only be controlled by the law
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