题目

阅读理解 “An apple a day keeps the doctor away.”Similarly, if we drink a little more water every day, we may find that we needto go to the doctor a lot less often. A healthy diet is made up of water and agreat many different kinds of foods. We know that healthy foods like fruits,vegetables and fish, are important as they provide us with energy and fiber,without giving us too much fat and sugar. But why is water important? The human body needs water to survive.Water is important as it carries poisons and waste out of our bodies. However,doctors advise us to drink plenty of water, much m5．下列变化，能说明分子是可以再分的是（　　）A．干冰气化B．分离空气制取氧气C．硫磺研磨成硫粉D．加热氧化汞得到汞和氧气