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.
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单项选择题
Where could this passage most likely be taken from
A．A magazine for specialists
B．A front page of a newspaper
C．A government report
D．A magazine with a general readership
单项选择题
Which of the following is the best rifle for the passage
A．Education of Children.
B．Kid's Country.
C．A Modern Invention.
D．How to Keep You Young.
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