【正文】 付它，而不是逃避。 and EnvironmentIt is undeniable that the worsening environment has bee the biggest concern of the presentday world. Waste gases poison the air we breathe. The rivers and lakes are polluted by waste dumped in them from factories. Some people are of the opinion that the environmental problem is the price we have to pay for economic development. But I do not think that this argument is valid. After all, what is the point of economic growth if people39。s lives are adversely affected by worsening environmental pollution?There is plenty of evidence to show that sustainable development can be achieved by balancing economic growth with protection of the environment. The key to achieving this is to make people aware of the seriousness of the problem. Both governments and ordinary citizens should join hands to make this world a better place to live in。17. Computer and Education.　　Computers are now essential in many areas of life – modern banking, retail and information exchange among others. However, this is not true for education. At a simple level some subjects may be better taught using puters, but to explain important concepts a human teacher is still indispensable.The puter can be programmed to provide an endless number of simple questions, and as the student answers these questions the facts are learned and reinforced.　　However, in the learning and practice of more plex ideas, the puter is not adequate. A puter can evaluate an answer as right or wrong, but it cannot determine why. It cannot find out why a student is making mistakes.　　Thus, while puters may be useful as a tool for practicing simple skills, they are not an essential feature of modern education。18. Negative Effects of TelevisionIt is obvious that watching TV has bee an important entertainment for us, but do you know there are many negative effects of television? Frist of all, it is bad for our health. we may have less time to take exercise if we watch too much television, and it’s bad for our health. Second, television may produce great negative effects to our teenagers. Children do not have enough experience. They do not realize that TV programs often show an unreal world, On the other hand, watching TV may take much time of them, teenagers may have less time to study, and they will be less absorbed in study. In a word, maybe we can get much useful information from television, but there are many negative effects too, so we should have a correct attitude to television.19. The Importance of Physical ExercisesPhysical are so important to our health. First, physical exercises can improve blood circulation, speeding up the supply of nutrients and oxygen to every part of the body and the removal of waste from the blood through sweating and exhalation（呼氣）. Secondly, physical exercises can promote a healthy metabolism（代謝）. It helps with the digestion（消化） and absorption of food, thus giving everyone a good appetite. Thirdly, physical exercise can help consume excessive(多余的) fat in the body, preventing people from putting on too much weight, thus keeping them in good shape. Finally, after physical exercises we usually need a good rest and a sound sleep at night, refreshing us for the next day39。s work.In conclusion, physical exercises not only keep us fit and strong, but also help us to be successful in our lives. Health is Better Than WealthPeople say health is better than wealth, My opinion is that health is the most important . I think that health is more important than wealth, money can39。t buy a healthy body. If people are not healthy, they can39。t work or study well. Health is the most important thing in the world. The first wealth is health .Once health is lost, it is no use having a lot of money. Without health money bees meaningless. No one agrees that a wealthy person without good health can be happy. So, just do our best and keep fit.So everyone, in this way, please pay more attention to what you have than to what you don39。t have. That39。s the door to true happiness. And try to realize its value.