题目

下列物质的变化，不能通过一步化学反应实现的是                    （   ）A．CuO→CuSO4B．Fe→ FeSO4C．HgO→O2D．KNO3→KCl 答案：D解析:略I don't like this kind of  bag. Would you please show me ______one?  [     ]A. more           B. other              C. another