题目

某溶液中含有HCO、Fe2+、AlO、CO四种离子，若向其中加入Na2O2后，溶液中离子浓度基本保持不变的是                                                        A．HCO      B．Fe2+ C．AlO                                 D．CO 答案：C照例子写句子并翻译。例: This is my father. → Is this your father? 1. This is my uncle. → ___________________________________________________2. This is my mom. → ___________________________________________________例: My brother is a doctor. → What's your brother? 3. My sister is a student. → ___________________________________________________4. My father is a farmer. → ___________________________________________________例: My family has five members. → How many people are there in your family? 5. His family has four members. → ______________________________________________