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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单项选择题

We may conclude from reading the passage that the government probably should ______.

A．take some legal actions to stop water pollution
B．include the control of non-point pollution in its water pollution control program
C．continue and emphasize the national water pollution control program
D．warn people to pay more attention to water pollution

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.