这个句子可作为主题句,因为可以围绕lonely,cynical展开段落。
Example 6: Let me tell you something about overpopulation.
这个句子太笼统,作为一个段落的主题太大,难于驾驭。
Example 7: Why has the world population been increasing sorapidly in the last decades?
这个句子是个较好的主题句,作者用the reasons for overpopulation in the last decades,从原因(cause)和时间(time)两方面限制了主题,能在一个段落内论述。
Exercise 3-1
Directions: Identify the areas which limit the topic sentences.
3.1.1 Soccer has become increasingly popular in the U. S. in the last ten years.
Topic:_____________
Limitations:________________________________________________
3.1.2 Pollution has caused three major problems in the last decades.
Topic:______________
Limitations:________________________________________________
3.1.3There are two kinds of memory: short-term and long-term.
Topic:____________
Limitations:________________________________________________
3.1.4 Women are playing an increasingly important part in society today.
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