2. 外语
  3. As pointed out at the beginning of the passage, people used to think that air pollution ______. This passage is primarily about

As pointed out at the beginning of the passage, people used to think that air pollution ______. This passage is primarily about

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问题 As pointed out at the beginning of the passage, people used to think that air pollution ______.
This passage is primarily about ______.
选项 A、the greenhouse effect
B、the burning of fossil fuels
C、the potential effect of air pollution
D、the likelihood of a new ice age
答案C
解析 文章是在讨论大气污染给人类带来的潜在影响。
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