在下列反应中,二氧化碳作氧化剂的是( ) A. Ca(OH)2+CO2=CaCO3↓+H2O B. CO2+C2CO C. 2Fe2O3+3C4Fe+3CO2↑ D. C+2H2O(g)2H2+CO2 答案:【答案】B 【解析】 【详解】A. Ca(OH)2+CO2=CaCO3↓+H2O反应中,没有元素化合价的变化,不是氧化还原反应,A错误; B. CO2+C2CO反应,CO2中C元素的化合价降低,则CO2为氧化剂,B正确; C. 2Fe2O3+3C4Fe+3CO2↑中C元素化合价升高,则C为还原剂,CO2为氧化产物,C.错误; D.C+2H2O(g)2H2+CO2反应中,C元素的化合价升高,
补全对话, 每空一词
A:Tomorrow is Sunday. 1 do you want to do?
B:I want to go to the zoo.Do you want to go 2 me?
A: 3 , I 4 . 5 shall we go there?
B:Let's make it 9∶00 in the morning.
A: 6 can I meet you?
B:At the gate of our school.
A: 7 animals can we see there?
B:We can see many interesting animals.
A: 8 you like elephants?
B:Yes, 9 do.
A:I like elephants, 10 .
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