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.________________________________________________
______________________________________________________________
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