文档介绍：外教一对一 :// yangjiajiao
文章来源： yangjiajiao
英语段落的展er, is no reason to spend on nuclear now.
(3)位于段中。位于段中的主题句起承上启下的作用，这类主题句多起转折作用，一般由“but，however，yet，anyhow，nevertheless”等词连接，用于引起下文。
例如：
What we teach ourselves sometimes，indeed，is more useful than what we learn from great men had little or no these great men probably studied harder by themselves than most boys do in greatest minds do not necessarily of those who have never been able to distinguish themselves at school，have been very successful in life has been said that Wellington and Napoleon were both dull boys at school，and so were Newt on and Albert Einstein.
2)写好主题句的方法
文章是否切题是路线性、方向性的问题。英语中的一致性(unity)原则要求每段只能有一个中心思想或主题，只能说明某一件事或某一个问题等，具体表达为要求段落“中心突出”。段落的中心思想或主题通常概括为一个主题句(topic sentence);其他各句称为支持句或从属句(supporting sentences)，将主题思想充分展开。概括地说，“中心突出”要求主题句与段落中其他各句统一，从意义上表达段落的完整性。
例如：
Ever since this century, electricity has become an essential part of our modern life. In fact, it has exerted great influence on our life and behavior. Electrical household appliances are making people more and more lazy. TV has been depriving children of their time for study after class. They can hardly finish their assignments. It is also depriving the cinema and theater of business. Electricity makes noises not only in factories but also in household by s