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

5. reduce reduce意為“減少”。句意：他們決定在空氣污染對環(huán)境造成更大的危害之前，采取措施減少污染。

題目來源：2015全品作業(yè)本高中英語必修2新課標(biāo)外研版 > Period One Introduction&Vocabulary and Reading

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