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议论文是运用逻辑证明和推理来阐明作者的立场和观点的写作方法 。 它 包括三个组成部分 ： 论点 、 论据和论证方法 。
论点 ： 论点是论说文的核心 ， 即中心思想 ， 是论据和论证服务的对象 。 论点 应符合以下要求 ：（1） 论点正确 ： 议论文首要的条件就是观点正确 ， 否则观点错 误将导致整篇文章的失败 ；（2） 论点明确 ： 文章的中心论点应该明确 ；（3） 论点 应有实际意义 ；（4） 一篇文章应只有一个主论点 。
论据 ： 一般说来 ， 作为支持论点的论据包括 ： 事实 、 数据 、 专家见解 、 科学原 理和定义等 。 事实是支持论点真实性的重要论据 。 用事实作论据时需注意 ： 论 据是否与本文相关 ， 论据是否具有代表性 ， 论据是否充分 。
论证 ： 论证是论据与论点之间联系的推理形式 。 四 、 六级考试中常采用直接 论证方法写议论文 。 直接论证的步骤为 ： 提出论点 → 引出论据 → 进行论证 。
People have different ideas about money and happiness （ 引导句 ）. In some people̓s opinion， happiness is measured exclusively in terms of money （ 重述句 ）. That is， the more money one possesses， the happier he is （ 主题句 ）. They think so because they believe that happiness consists in satisfaction of human desires with what money can exchange for （ 解释理由 ）. So， according to these people， the wealthy can always achieve what they want， while those with a limited income seldom have the opportunity to enjoy life （ 推论 ）. This is， of course， not the case （ 结论 ）.
However， another belief is also popular， which is opposite to the above one （ 引 导句 ）. Some other people believe that money is the root of all evil （ 主题句 ）. To them， all crimes or sins， such as murder， robbery， theft， deception， are committed for the sake of money （ 解释理由 ）. However， they seem to have laid the balance on the wrong place （ 反驳 ）. It is true that quite a few people are driven to wrong doing by their thirst for money （ 事实 ）. But a lot of good things are done with the help of money（ 事实 ）. Therefore， money should not be thought of as the root of evil （ 结论 ）.
As demonstrated above， I disagreed with either of these two opinions （ 主题 句 ）. In my opinion， happiness is the fulfillment of life for a person as a member of society （ 解释理由 ）， which requires a lot that is beyond the reach of money such as good health， love， friendship， satisfaction derived from a successful career， and even the sacrifice made for other̓s happiness （ 补充 ）. So money does not guarantee happiness （ 结论 ）. Nor is money the origin of evil （ 重述主题 ）. Instead， money， as the symbol of wealth， when earned by honest work， is the reward one gets from society for the contribution one has done for it （ 理由 ）.