A:能使酚酞试液变红的溶液中:H+、SO42﹣、Na+、NO3﹣
B:加入Al能放出氢气的溶液中:NH4+、SO42﹣、Mg2+、HCO3﹣
C:含有大量Cl2的溶液中:Ba2+、K+、NO3﹣、I﹣
D:强酸性的溶液中:Cu2+、Br﹣、Ca2+、Cl﹣
Miss Smith, an American lady, has taught English for three years.
文学常识填空。