题目

在强酸性溶液中能大量存在，并且溶液为无色透明的离子组是(    )     A．  Al3+         B．K+  Na+  Cl-      C．K+           D．Na+  K+     答案：AB 解析:C项中紫色，且在强酸溶液中不能大量存在。D项中在酸性溶液中不能大量存在。The rich only      themselves in making money and had no eye for the needs and welfare of their workers.A．devotedB．occupiedC．enjoyedD．concerned