Another view, ess widely held, is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth’s temperature—a result that would be equally disastrous.A drop of just a few degrees could create something close to a new ice age,and would make agriculture difficult or impossible in many of our top farming areas.Today we do not know for sure that either of these conditions will happen.Perhaps,if we are lucky enough,the two tendencies will offset each other and the world's temperature will stay about the same as it is now.Driven by economic profits.people ignore the damage on our environment caused by the “advanced civilization”.Maybe the air pollution is the price the human beings have to pay for their development.But is it really worth-while?
66.People used to think that air pollution
.
A.caused widespread damage in the countryside
B.affected the entire eastern half of the United States
C.had a very bad effect on health
D.existed merely in urban and industrial areas67.As to the greenhouse effect, the author
.
A.shares the same view with the scientists.
B.is uncertain of its occurrence
C.rejects it as being ungrounded
D.thinks that it will destroy the world soon
68.The underlined word “offset” in the second paragraph could be replaced by
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