Much of the pollution could be controlled if only ______.
A.people would pay more attention to the problem
B.governments would take effective measures
C.all sides concerned would take more efforts
D.farmers would use less artificial fertilizers
第4题
去蜡之前通常将型盒置于热水之中,热水的温度不得低于
A、50℃
B、60℃
C、70℃
D、80℃
E、90℃
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