单项选择题

New ways have been found to prevent the river（）.

A. not to be polluted
B. against polluting
C. from polluting
D. from being polluted

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单项选择题
（）that the trade between the two countries reached its highest point.

A. During the 1980's
B. That it was in the 1980's
C. It was in the 1980's
D. It was the 1980's
单项选择题
The business of doctors is to prevent and （） disease.

A. kill
B. cure
C. wound
D. injure
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