对于大部分烤鸭大作文是永远的痛，审题偏题，论证不清晰，不知道如何拓展，框架结构混乱，句子质量较低等。针对这些问题，咱们再以后一一解答，今天这篇文章主要讨论如何有效扩展论点或中心句，从而达到官方评分标准TR中的well-developed response.

　　讨论论证方式之前，咱们先讨论西方persuasive elements(论证元素)鼻祖：亚里士多德---古希腊思想家，哲学家，教育家写过的一本书《论修辞学》。

　　这本书里讨论的persuasive elements包含所有的论证方式---logos，ethos，and pathos。

　　以此为指导，雅思写作论证方式推荐之---解释说明，咱们一起看下面这个例子。

　　学生文章：Tourism can promote local economic development, because it can bring the development of local relevant industries, especially catering and hospitality services and it can also bring more employment opportunities.

　　通过这篇文章我们可以看到对一个常见的tourism论点，大部分学生都会这样写，这段包含的基本问题是 论据中缺少事实，直接从旅游业促进经济发展---》推导出旅游带来行业发展和就业增加。总共只写29个词。

　　修改后：Tourism can promote local economic development. As is known to all, in the era full of business opportunities, tourism has always been regarded as one of the most important industries in many parts of the world. In order to get refreshed or broaden their horizons, a large number of tourists from different nations often visit those popular and picturesque tourist attractions on holidays. Most of them are likely to spend their money on n accommodation, local cuisine, or other services. Thus, such massive and extensive consumption will make great contribution to the progress in local industries, especially catering and hospitality services, and the rise in personal income.

　　这部分内容加入了相关的事实和细节，论证思路economic development-》游客consumption-》relevant industries 发展。 关于旅游detailed facts的描述就能有效拓展自己的论点给出更详细的论证。