题目

下列反应中不能说明SO2是酸性氧化物的是（  ） A．SO2+Cl2+H2O = H2SO4+HCl    B．SO2 +H2O      H2SO3 C．SO2 +NaOH = Na2SO3+ H2O    D．SO2 +Na2O == Na2SO3 答案：A When you do not understand a word, you can _______in this dictionary. A. look it up         B. look them up     C. pick it up     D. pick them up