题目

---- When did you last hear _____Jay? ---- He phoned me this morning, and we agreed _____ a time and place to meet. A. of; to  B.  about; with  C.  from; with  D. from; on 答案：D 往某无色溶液中加稀盐酸，会产生一种可以使澄清石灰水变浑浊的气体，则原溶液中可能存在的离子是（　　） A、H+B、Ca2+C、CO32-D、Cu2+