题目

写出下列反应的化学方程式，并注明氧化剂、还原剂。（1）“曾青得铁则化为铜”：__________________。（2）用CO还原Fe2O3炼铁：___________________。 答案：（1）Fe+CuSO4=Cu+FeSO4氧化剂：CuSO4  还原剂：Fe（2）3CO+Fe2O32Fe+3CO2氧化剂：Fe2O3  还原剂：CO补全对话。根据对话内容，用所给出的句子把对话补充完整。A. She should see a doctor. B. How does she feel now? C. Don’t be sad. D. What’s wrong? E. Oh, no.Mum: John, come here, please.John: 1.____________. Mum: Grandma is ill. 2. ____________. So we can’t go to the zoo today.John: 3.____________. Mum: 4. ____________. We can go next Sunday.John: 5. ____________. Mum: Not well. Let’s go to the hospital.