题目

---Mum, I’m going out with my classmate tonight.    ---OK. But you’d better _____ back too late.   A. don’t come        B. not to come       C. not coming   D. not come 答案：D7．下列离子方程式正确的是（　　）A．醋酸铵溶液和盐酸反应：CH3COONH4+H+═CH3COOH+NH4+B．碳酸氢铵溶液和过量氢氧化钠溶液：NH4++OH-═NH3•H2OC．偏铝酸钠溶液和过量盐酸：AlO2-+4H+═Al3++2H2OD．钠跟水反应：Na+2H2O═Na++2OH-+H2↑