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    【题目】When we use metals,it is important to know how they rwith different substances,for example,water and oxygen.

    【答案】react
    【解析】句意：当我们使用金属时，重要的是要知道它们是如何与不同的物质发生反应的，例如水和氧。本句说的是一般状况，谓语动词react“反应”用一般现在时态，故填react.

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