第一单元 段落简介
1.1段落
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(describe something),或争论某事(argue about something),或对某事提出疑问(question something),或要求什么(demand something),或给事物下定义(define something),或驳斥某观点(reject something)。
1.2典型段落的构成
一个典型的段落通常由三部分组成:(1)主题句(the topic sentence);(2)说明或支持主题的推展句( supporting sentences);(3)结论句(the concluding sentence)(有些段落没有该部分)。
示范段落1-1
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.
1.3示范段落分析
这是一个典型的段落,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。
Exercise 1-1
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 worlds growing population.
Topic Sentence:____________________________________________
______________________________________________________________
Details: 1.________________________________________________
______________________________________________________________
2._______________________________________________________
______________________________________________________________
Concluding Sentence:________________________________________
______________________________________________________________
(2)
The Americans and the British not only speak the same language but also share a large number of social customs.For example, in both America and England, people shake hands when they meet each other for the first time. Also, most English men will open a door for a woman or offer their seat to a woman, and so will most Americans. Promptness is important both in England and in America. That is, if a dinner invitation is for 7 oclock, the dinner guest either arrives close to that time or calls up to explain his delay.
Topic Sentence:____________________________________________
______________________________________________________________
Details: 1.______________________________________________
______________________________________________________________
2._______________________________________________________
______________________________________________________________
3.________________________________________________________
______________________________________________________________
Concluding Sentence:________________________________________
______________________________________________________________
(3)
Birds use many different materials to build nests.Some birds use bits of grass. The tailor-bird of Africa and India uses grass to sew leaves together. Other birds find twigs and pebbles useful.
Topic Sentence:_____________________________________________
______________________________________________________________
Details: 1._____________________________________________
______________________________________________________________
2.______________________________________________________
______________________________________________________________
3.______________________________________________________
______________________________________________________________
Concluding Sentence:_______________________________________
______________________________________________________________
[动词不定式]不定式作宾语
[动名词]动名词作主语、宾语和表语
[形容词和副词]as + 形容词或副词原级 + as
[特殊词精讲]感官动词 + doing/to do
[动词]助动词have的用法
[冠词和数词]冠词与形容词+名词结构
[特殊词精讲]go on doing/to do
[特殊词精讲]try doing/to do
[动词]非谓语动词
[特殊词精讲]stop doing/to do
[动词不定式]不定式作状语
[动词不定式]不定式作补语
[动名词]短语动词
[动词不定式]动词不定式
[形容词和副词]多个形容词修饰名词的顺序
[动词不定式]不定式作主语
[动词]短语动词
[特殊词精讲]be interested doing/to do
[代词]物主代词
[独立主格]with的复合结构作独立主格
[动词]助动词do 的用法
[动词不定式]不定式的时态和语态
[分词]分词
[代词]相互代词
[特殊词精讲]regret doing/to do
[特殊词精讲]cease doing/to do
[动词]助动词be的用法
[形容词和副词]形容词与副词的比较级
[特殊词精讲]begin(start) doing/to do
[动词不定式]用作介词的to
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