and waste out of our bodies. However, doctors advise us to drink plenty of water, much more than the small amount we need to stay alive.

　　Some doctors believe that water is important for our health in all kinds of ways. They believe that a great many illnesses and health problems start as a result of dehydration(脱水)-a lack of water in the body. Most people are dehydrated at least some of time, although they probably don't know it. It is surprising to learn that if we feel thirsty, we are already in the first stage of dehydration. In fact, we are advised to drink water before we feel thirsty.

　　These doctors think that health problems such as headaches, high blood pressure and asthma(哮喘) could be helped if people drink more water. They also believe that drinking more water can help people who are overweight. Water contains no calories so it will not make us put on weight. If we drink water, we will probably drink less sugary soft drinks such as Coca-cola. Doctors also believe that drinking more water may stop people from overeating. They say that many people think that they are hungry when they are, in fact, thirsty. Doctors suggest, therefore, that we eat less food and drink more water. There are still many health problems that cannot be solved by drinking water, so we should not stop going to seeing the doctor completely. However, if we make a decision to drink water every day, we may find that we need to go to the doctor a lot less often.

25. From the text, we know water can carry_________.

　　A. poisons and waste out of our bodies B. fruit, vegetables and fish in our bodies

　　C. sugar and fat out of our bodies D. energy and fiber in our bodies

26. Some doctors think that________.

　　A. people eat too much sugar B. water is not important for our health

　　C. we should go to the doctor less oftenD. some health problems are caused by a lack of water

27. Lack of water caused people to put on weight too much because_______.