题目

________ amazed us greatly was that Linda could speak five languages.    A. That                   B. What                    C. Which            D. Why 答案：B  除去SO2中混有的HC1气体，可选用的试剂是  （   ） A 石灰水   B浓硫酸   C饱和NaHSO3溶液   D饱和Na2SO3溶液