题目

—Michael has changed beyond recognition. —       ！How did he manage to lose so much weight？ A. So has he            B. Neither has he        C. So he has         D. Neither he has 答案：C 解析: 略下列物质，在空气里敞口放置一段时间后，质量增加的是（ ）A．浓盐酸B．蔗糖溶液C．浓硫酸D．食盐