题目

 The missing children haven’t been found yet. Something terrible ________ to them. A. may happen      B. should have happened C. must happen     D. might have happened 答案：D下列反应的离子方程式中错误的是       A．氯化铝溶液中加入过量的氨水Al3++3NH3·H2O=Al(OH)3↓+3NH4+              B．铁片放入过量的稀硝酸中3Fe+8H++2NO3-=3Fe2++2NO2↑+4H2O       C．将铝片放入过量NaOH溶液中2Al+2OH+2H2O=2AlO2-+3H2↑       D．偏铝酸钠与过量盐酸反应AlO2-+4H+=Al3++2H2O