题目

现有失去标签的氯化钙、硝酸银、盐酸、碳酸钠四种无色溶液，为了确定四种溶液各是什么，将它们随意编上A、B、C、D后，产生的现象如表所示。根据实验现象推断 写出A、B溶液中溶质的化学式：A_________________；B ________________  ； 写出反应③④的离子方程式： ③ _____________________________________________                                      ④_____________________________________________                                        — How do you like the English talk given by Peng Liyuan in the USA?— It’s worth many times.A. listening B. hearingC. being heard D. listening to