Flea market can be found on almost every campus. Although some sell new products in these markets, most students go there to sell used articles, such as textbooks, test preparation materials, dictionaries, and CDs. This has aroused different reactions. Some view it as a meaningful method to dispose of things no longer useful, but some others, especially teachers, view it as a symbol of wasting. What is your opinion about getting rid of used things in this way? Write a composition of about 400 words on the following topic:My Opinion on Campus Flea MarketIn the first part of your writing you should present your thesis statement, and in the second part you should support the thesis statement with appropriate details. In the last part you should bring what you have written to a natural conclusion or a summary.　　Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks.

正确答案：
My Opinion on Campus Flea Market As we university students progress from one grade to another, we may find that besides other things, we have accumulated a large pile of things that is no longer useful, for example, textbooks, test preparation materials, tapes and CDs. How to deal with the pile is really a big problem. Some throw them away, some prepare to keep them as souvenirs, and some sell them in flea market on campus. I find the last choice is the best one, because flea market actually can bring many benefits.
Flea market has much to offer for sellers. Obviously it can help sellers get some money. By selling things that are no longer needed, they can cover some of the original cost. This can be of much importance to students who do not have their own income. Last semester I sold about 30 books in the flea market, and the money was enough to cover my food bill for almost a month. Besides, selling things in flea market can also help sellers cultivate a good habit of making the fullest use of their belongings. This will prevent them from throwing things away at will, thus becoming a thrifty person.
If it just benefits sellers, flea market cannot be so prosperous. In fact, buyers also stand to gain a lot. Things sold in this place are usually much cheaper than the new ones in stores, but the function is almost the same. If they buy their textbooks and other reference books here, they can save about 200 yuan every semester. It is said that second-hand book stores are very popular in foreign countries, and many students from poor families finish their colleges by getting most of books there. Here in China there are also many students troubled by financial difficulty. If university authority can organize a regular market, many poor students will find it easier to finish their university.
The third benefit, which is usually neglected, is the positive influence on environment. This may sound irrelevant, but in fact, when we are using used products, we can help save paper, save printing materials, and this can greatly reduce the negative impact on the already fragile environment. What's more, if we develop the habit of reusing products, we can make our contribution to the establishing of a recycling economy that the government is advocating. Experts estimate that if all textbooks in universities can be used once again, we can save about 100 million yuan in environmental protection. This fully demonstrates the social significance of the tiny market place.
Therefore, if well managed, flea markets on campus can benefit sellers, buyers and the whole society as well. Of course, we should not sell everything used, for some of them may become valuable souvenirs all our life. It will be a pity if you graduate empty-handed. But as for those things that we can get rid of, we should carry them to the flea market rather than the dustbin.

解析：
这道题要求讨论对于校园里的跳蚤市场的态度，而这篇文章作者分别从对卖者、买者和对环境保护这三个角度阐述了这种市场的好处。作者在说明跳蚤市场的好处时，没有停留在省钱这个肤浅的层次上，而是深入探讨了它对卖者习惯的培养、对买者的大学教育以及对建设循环经济和保护环境的意义，这无疑加深了文章的深度。作者不是单一使用逻辑推理，除了推理性的解释外，作者还用到了自己的经历、专家证言和数据等。这有助于增强文章的说服力。