题目内容
(请给出正确答案)
[主观题]
The underlined word "smog" (in Paragraph 2) mean"______ ".A.a kind of brown smokeB.the mai
The underlined word "smog" (in Paragraph 2) mean"______ ".
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
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