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  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 本题为主旨归纳题。在第一段中作者讨论的是会不会产生温室效应，如果有会有什么样的结果；在第二段中作者又给我们提出另一种观点，即空气中的大量粉尘会影响太阳对地面的辐射，从而导致气温降低。通观全文我们可知，作者在本文所关心的焦点是空气污染的潜在效应。
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