【題目】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：當(dāng)我們使用金屬時(shí)，重要的是要知道它們是如何與不同的物質(zhì)發(fā)生反應(yīng)的，例如水和氧。本句說(shuō)的是一般狀況，謂語(yǔ)動(dòng)詞react“反應(yīng)”用一般現(xiàn)在時(shí)態(tài)，故填react.

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