题目

除去下列溶液中的杂质(括号内是杂质)所用试剂错误的是() A . CO2[HCl]：用饱和的NaHCO3溶液 B . CO2[SO2]：用饱和酸性KMnO4溶液 C . Cl2[HCl]：用饱和的NaCl溶液 D . SO2[HCl]：用饱和的Na2SO3溶液 答案：DThe safety of food has become one of the _________ problems in our daily life.A. more expensive B. more importantC. most expensive D. most important