We can eliminate pollution completely by the year of 2008. [br] ______is beginni

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问题 We can eliminate pollution completely by the year of 2008. [br] ______is beginning to threaten our health, our happiness and our civilization.

选项

答案 pollution

解析第3段最后一句，污染正开始在威胁我们的健康、幸福和文明。

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