段落是构成文章的一组句子。段落必须表达完整的意思：或描写事物，或争论某事，或对某事提出疑问，或要求什么，或给事物下定义，或驳斥某观点。一个典型的段落通常由三部分组成：(1)主题句;(2)说明或支持主题的推展句;(3)结论句(有些段落没有该部分)。下面前程百利小编通过具体的范例来向考生展示段落的结构。
示范段落：
We all know that cigarette smoking is a dangerous habit because it causes health problems. Doctors say it can be a direct cause of cancer of the lungs and throat and can also contribute to cancer of other organs. In addition， it can bring about other health problems such as heart and lung diseases. It is clearly identified as one of the chief causes of death in our society.
示范段落分析：
以上是一个典型的段落，可概括提纲如下：
主题句： We all know that cigarette smoking is a dangerous habit，because it causes health problems.
推展句： 1. Doctors say it can be a direc cause of cancer of the lungs and throat and can also contribute to cancer of other organs.
2. It can bring about other health problems such as heart and lung diseases.
结论句： It is clearly identified as one of the chief causes of death in our society.
从以上提纲可见，主题句提出了一个问题： What kind of health problems does cigarette smoking cause?随后的两个推展句回答了这个问题，结论句总结了推展句并再一次强调主题句。
练习：
Directions： Read the following paragraphs and find out the topic sentence， the supporting details and the concluding sentence， if there is one.
(1)
The need for wildlife protection is greater now than ever before.About a thousand species of animals are in danger of extinction，，and the rate at which they are being destroyed has increased. With mammals， for instance， the rate of extinction is now about one species every year; from A. D. 1 to 1800， the ratewas about one species every fifty years. Everywhere， men are trying o solve the problem of preserving wildlife while caring at the same time for the world's growing population.
Topic Sentence：____________________________________________
______________________________________________________________
Details： 1.________________________________________________
______________________________________________________________
2._______________________________________________________
______________________________________________________________
Concluding Sentence：________________________________________
______________________________________________________________
以上就是小编为大家分享的有关段落结构的写作技巧，希望对大家有所帮助。有关托福写作的更多内容，请关注前程百利托福考试栏目。
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