【正文】 39。t waste it. Of course, we have to use it to drink, cook, wash, clean and etc. But we must remember not to use it extravagantly. If we didn39。t stop such wasteful habits, we would cut off the development of the world and the human life.E．其他：(1) Companionship of Books A man may usually be known by the books he reads as well as by the pany he keeps: for there is a panionship of books as well as of men。 and one should always live in the best pany, whether it be of books or of men. A good book may be among the best of friends. It is the same today that it always was, and it will never change. It is the most patient and cheerful of panions. It does not turn its back upon us in times of trouble or distress. It always receives us with the same kindness, amusing and instructing us in youth, and forting us in age. Books possess an extract having the fundamental properties of immortality. They are by far the most lasting products of human effort. Temples and statues decay, but books survive. Time is of no account with great thoughts, which are as fresh today as when they first passed through their author39。s minds ages ago. The only effect of time has been to sift out the bad products, for nothing in literature can long survive but what is really good. Books introduce us into the best society: they bring us into the presence of the greatest minds that have ever lived. We hear what they said and did. we see them as if they were really alive。 we sympathize with them, enjoy with them, hurt with them。 their experience bees ours, and we feel as if we were, in a measure, actors with them in the scenes which they describe. The great and good do not die even in this world. Embalmed in books, their spirits walk abroad. The book is a living voice. It is an intellect to which one still listens. Hence we ever remain under the influence of the great men of old. The great intellects of the world are as much alive now as they were ages ago.(2) How to Keep Healthy Nowadays more and more people are concerned about their health. But how to keep healthy? Different people may give different answers to this question. In my opinion, it is essential to do the following. First, it is absolutely necessary to take some exercise every day. Research shows that getting plenty of exercise make the heart beat faster and the lungs work harder. This strengthens the heart, reduces the chance of heart attack, and helps lower blood pressure. That39。s why more and more people are being active in various kinds of sports and exercises. Every morning many people get up early and take much exercise. Some practice shadowboxing and swordplay while others run, jog, walk or dance to music. In the afternoon, there are also many people keen on sports. Some play basketball or volleyball or table tennis, others go in for gymnastics or track events. Through sports and exercise, people bee healthier and stronger. Medical researchers have proved that what people eat affects their health. They advise people to eat more fruit and vegetables and less meat such as beef and pork because meat contains more fat than poultry and fish. Fat can build up in the arteries, block the flow of blood, and cause a heart attack or stroke. Getting rid of bad habits like smoking and drinking alcohol is also an important way to keep healthy. Smoking and drinking alcohol injure one39。s health a great deal, and therefore should be given up. Unfortunately few people follow this advice. If people follow these three ways of keeping fit, they greatly improve their health.(3) Children and Television Television has been changing the way people live for thirty years. It influences nearly every aspect of modern life. how people use leisure time, how news is reported, how information is learned, and how people think and feel. Children are particularly susceptible to the effects of television because their minds are growing, developing, and learning much faster than those of adults. Whereas television could be used as an educational tool for children, more often simple entertaining cartoons with little or no educational value are shown. Social scientists, teachers, and parents are troubled by the kinds of television programs children choose to watch. These groups of people are concerned about the media39。s impact on young .children. They are worried about the effects of televised violence on society as well as mercials for sugarcoated food. Most importantly, however, they feel television is one factor that causes declining math and reading scores among schoolchildren. Because of the excessive time spent in watching TV, children are spending less time readingand thinking independently. Experts are concerned about the view of the world that youngsters are learning from television. Parents, schools, and churches have traditionally been the social models and teachers for children. However, because television influences children39。s attitudes and behavior, its role in society is being increasingly more powerfulit is much more than a simple recreational activity. Exposure to excessive violence is another influence of television. According to several studies, televised violence may cause children to bee more aggressive. Also, because so much violence is seen by children on television, they bee more used to it as the only solution to difficult situations. Children who watch a great deal of violence on television may bee apathetic toward actual aggression. One study has shown that, pared to a control group, fifthgraders who watched an aggressive television broadcast were slower to ask for adult help when a fight broke out among younger children.12