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 根据第二段第二句话“A drop of just a few degrees...”可推知。
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