We can eliminate pollution completely by the year of 2008. [br] Once we thought

游客2024-06-18 39

问题 We can eliminate pollution completely by the year of 2008. [br] Once we thought of pollution as meaning simply______.

选项

答案 smog

解析参考第4段第1句。

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Pollutionhasbecomeaseriousprobleminalmostallthebigcitiesofthewor