题目

能正确表示下列反应的离子方程式是（    ）  A．NaNO2溶液中加入酸性KMnO4溶液：2MnO4﹣+5NO2﹣+6H+═2Mn2++5NO3﹣+3H2O  B．碳酸氢铵溶液中加入足量氢氧化钡溶液：NH4++HCO3﹣+2OH﹣═CO32﹣+NH3•H2O+H2O  C．Fe（NO3）3溶液中加入过量的HI溶液：2Fe3++2I﹣═2Fe2++I2  D．用惰性电极电解熔融氯化钠：2Cl﹣+2H2O═Cl2↑+H2↑+2OH﹣________ the quality of schooling is high, parents are eager not only send their children to school. but also to ________ them there. 　 A. Where, keep　　　 B. Where, leave　　 C. When, keep　　　 D. When, leave