单项选择题

Which of the following adjectives can best describe the author's attitude toward water pollution problem

A．concerned
B．indifferent
C．deserved
D．surprised
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单项选择题
In the author's opinion ,point-source pollution is ______.
A．less difficult to control than non-point pollution
B．the minor pollution source
C．more difficult to control than non-point pollution
D．a problem that cannot be solved
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