题目

Of the thousands of different kinds of animals that exist in the world man has learned to make friends with an enormous number. Some are pets, and offer him companionship; some give protection, and some do hard work which man cannot do for himself. Dogs, which serve man in all four capacities(Korea and China are big dog eaters), are found in various breeds(动物品种) in all countries of the world. The Husky can live in the cold polar regions， and the Saluki is at home in the hottest parts of Central Africa. The inhabitants of certain countries are dependent for their very lives on the cam下列各组离子在溶液中能大量共存的是（　　）A．Ca2+、HCO3-、Cl-、K+B．Al3+、AlO2-、OH-、Na+C．Fe3+、NH4+、SO42-、I-D．Fe3+、SCN-、Na+、CO32-