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  3. As pointed out at the beginning of the passage, people used to think that air pollution ______. It can be concluded that ______

As pointed out at the beginning of the passage, people used to think that air pollution ______. It can be concluded that ______

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问题 As pointed out at the beginning of the passage, people used to think that air pollution ______.
It can be concluded that ______.
选项 A、raising the world’s temperature only a few degrees would not do much harm to life on earth
B、lowering the world’s temperature merely a few degrees would lead many major farming areas to disaster
C、almost no temperature variations have occurred over the past decade
D、the world’s temperature will remain constant in the years to come
答案B
解析 本题为细节推理题。第二段作者提到“A drop of just a few degree could create something close to a new ice age，and would make agriculture difficult or impossible in many of our top farming areas.”也就是说，如果地球气温降低几度许多地方将无法从事农业生产，从而导致灾难性后果。
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