题目

— What did the teacher say just now? — Sorry, I didn’t hear it.  I          out of the window.        A. look                        B. looked                   C. am looking              D. was looking 答案：D 下列离子方程式书写正确的是 [　　] A． 铁跟盐酸反应：2Fe＋6H+2Fe3+＋3H2↑ B． 碳酸氢钙溶液跟过量氢氧化钠溶液反应：Ca2+＋HCO3－＋OH－CaCO3↓＋H2O C． 次氯酸钙溶液中通入过量的CO2；ClO－＋H2O＋CO2HCO3－＋HClO D． 氯化铝溶液与过量的氨水反应：Al3+＋4NH3·H2OAlO2－＋4NH4+＋2H2O