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问题 选择题

关于反应Ｈ－＋ＮＨ３＋Ｈ２的说法正确的是（   ）

A．Ｈ－为氧化剂

B．ＮＨ３为还原剂

C．Ｈ２既是氧化产物又是还原产物

D．属于非氧化还原反应

答案

答案：C

由于存在化合价变化，此反应为氧化还原反应，其中H-化合价升高，为还原剂，故NH3为氧化剂，H2既是氧化产物又是还原产物。应选C。

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一个数乘百分数可以把百分数化成（    ）或（    ）进行计算。
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请你对下文内容进行修改。文章中共有10处错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。

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My favorite sport is football. I was a member of our school football team. We practice for three times every week and often watch football match on TV together. Play football not only makes us grow up tall and strong but alsogive us a sense of fair play and team spirit. We must keep in minds that we play for the team instead ourselves. Also sport teaches us the important of obedience (服从) . Each player must obey the captain, which is the leader of the team. And they must not break the rules too often if we want to win the game.
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