2. 外语
  3. The passage mainly tells us ______. The underlined word "smog" (in Paragraph 2) mean"______ ".

The passage mainly tells us ______. The underlined word "smog" (in Paragraph 2) mean"______ ".

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问题 The passage mainly tells us ______.
The underlined word "smog" (in Paragraph 2) mean"______ ".
选项 A、a kind of brown smoke
B、the main chemical in ozone
C、smoke caused by air pollution
D、brown unhealthy air caused by smoke from cars or factories and fog
答案D
解析 第二段最后一句话the air pollution that is a combination of fog and smoke是对smog的解释。可知D为正确答案。
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