Unit 3　Looking good，feeling good

　　【美文阅读】　

　　How to keep fit

　　生命对于我们只有一次，我们有道理也有必要珍惜我们的生命。我们怎样才能延年益寿？

　　An English proverb goes: An apple a day keeps the doctor away. From this we can see a good and balanced diet is very important for one's health. That is a mixture of all kinds of useful substances-carbohydrates(碳水化合物), fats, proteins(蛋白质), fiber, minerals, vitamins, and water. Carbohydrates supply about half of your energy. Proteins are for body building. You need them for growth and for replacing dead cells. Your body also needs small amounts of minerals and vitamins. For example, calcium(钙)is important for making bones and teeth and it is from cheese and milk you eat. You can see nothing at night if you lack vitamin A．Fiber can't be digested(消化), but it is good for your body because it helps food pass through your gut(肠)more easily. You need about a litre of water every day and more if it is hot or you are very active. Drinks, fruits and other foods contain water in them.

　　The public opinion

　　All living things need food. Good and suitable foods really have much to do with good health. If poisonous(有毒的)chemicals get into food, they can kill living things. So we can't eat polluted food and we can't drink polluted water. What's worse, with the development of modern agriculture and industry, more and more waste is produced. Agriculture and industry should not go against nature. We should take science, technology and balance of the nature into accounts in agriculture and industry.

　　A middle school teacher

　　I think we should form good habit of life. We should eat three meals in correct time. Smoking is harmful to our health. It is a pity that there are a lot of people who do not know the importance of good health. They spend their limited time smoking and drinking. They do not know they just waste part of their own lives.

　　One of the middle school students

　　As to us middle school students, after a day of hard study, we should have sports for one or two hours. Only work with no play will make a clever boy dull. We middle school students should enjoy a colorful life in school. Our life should be happy, healthy and interesting.

　　【诱思导学】　

　　1．To keep fit, what kinds of useful substances do people need in their daily life?

　　2．Do you think it is enough for a healthy person to have right foods? Give your own reasons.

　　【答案】　1. To keep fit, people should need a mixture of all kinds of useful substances-carbohydrates(碳水化合物), fats, proteins(蛋白质), fiber, minerals, vitamins, and water.

　　2. Of course not. Because I think a healthy person needs a good habit of life and regular sports as well as right foods. / No. Because in my opinion, to keep fit, a person not only needs right foods but also needs a good habit of life and regular physical exercise.