题目

下列化学反应中，属于氧化还原反应的是                                                               （    ）A．Na2CO3+2HCl=2NaCl+CO2↑+H2O              B．CaO+H2O=Ca(OH)2C．2CO+O22CO2     D．CaCO3CaO+CO2↑  答案：C解析: 　　A: What ________ pizza would you like? 　　B: I’d like a large pizza. 　　A: Oh, ________ would you like ________ it? 　　B: I’d like mushroom, green peppers, please. What about you? 　　C: Er…I’d like a ________ pizza. 　　A: Not large? 　　C: No, I don’t want a ________ one. 　　A: What would you like on it? 　　C: I ________　________　onions and tomatoes, please. 　　A: For here or to go? 　　B, C: To go.