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    5. They decided to take measures to       air pollution before it did more damage to the environment.

    5. reduce reduce意为“减少”。句意：他们决定在空气污染对环境造成更大的危害之前，采取措施减少污染。

    题目来源：2015全品作业本高中英语必修2新课标外研版 > Period One Introduction&Vocabulary and Reading

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