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在学会写句的基础上，就可以开始学习如何将句子有序地连贯起来，这就组成了段落。段落是构成语篇的基础。 1. 段落的基本结构 段落(Paragraph)是由阐述同一主题紧密相关的若干句子组成，是一则语意完整、和谐统一的语篇。一般说来，一个段落由3部分组成：主题句、扩展句和结论句。主题句提出论述的主题，扩展句利用必要的细节对主题加以论证说明，结论句总结全文，在论证的基础上得出结论。三者相辅相成，按逻辑顺序安排句子，并通过一些过渡句，构成一篇完整的短文。 On Safety ①Accidents are today's most frequent cause of death in Children. ②Accidents occur to children in all sorts of places — at home, on the street, at school, on public playgrounds, at places to swim, and on camping trips. ③There are now many more chances for accidents than there used to be. ④Automobiles, power tools, electric wiring, and easy ways of starting fire are some examples. ⑤Most accidents are caused by carelessness. ⑥A great deal of effort should be taken to let children know the importance of safety. ⑦Safety is everyone's business. On Safety 分析：在这一段落中，句①即为主题句，阐述段落的中心思想；句②，③，④，⑤和⑥为发展句，列举原因、例子等来丰富和阐明中心思想；句⑦为结尾句，与主题句相呼应，概括该段落的真正含义。 2. 段落的主题句 | 
