第三讲 理清文架构———核心 抓段落构成———知主题句 一、段落的构成 英语文章段落结构一般由三部分构成：主题句(topic sentence)，扩展句(development sentence)和结论句(closing sentence/concluding sentence)。主题句点出段落的主题，扩展句解释说明或论证主题，结论句总结、归纳或概括主题。 1．主题句 主题句，就是段落的核心句、纲领句、主旨句、中心思想句，言简意赅，主旨鲜明。它是段落的灵魂，表达段落的主题，在英语文章段落中居于主导地位，其他句子都要围绕它而展开。英语文章一般喜欢开宗明义，所以主题句一般位于文章段首，但有时也在段中或段尾。 2．扩展句 扩展句就是为主题句起解释说明或论证作用的句子。扩展句一般长度适中，有一定的条理和逻辑。扩展句的展开方法多种多样，通常采用的方法有举例说明、描述、定义、比较对照、因果分析、分类等。 3．结论句 结论句就是总结句，会重述或总结段落的中心论点，与主题句相呼应。需要指出的是，英文段落中结论句并不多见，我们通常看到英语的文章段落结构60%一70%都是由“主题句＋扩展句”构成。 [典例] Why fiction is superior to textbooks lies in their imagination(主题句：以自问自答的方式提出段落主题)．Authors of the fictions always create attractive characters so as to give his opinion about nature and the society as well as life(扩展句1)．It not only provides knowledge，but also teaches us what is the right attitude toward life (扩展句2)．For instance，we can learn from Gone with the Wind how to be a strong?willed person；from Jack London，how to love life(扩展句3：基于上述观点，进一步举例说明)．We can be stimulated to overcome all obstacles to realize our ambitions(扩展句4)．So，fictions enable people to form their positive view of life，the spirit of optimism and invincible courage，and provide us with an opportunity to learn and to practice，while textbooks barely can (结论句：归纳总结段落主题)． 二、段落主题句的位置 在进行阅读理解时，我们要善于找出段落的主题句，这样才能抓住文章段落的中心思想(controlling idea)。主题句在段落中的位置并不是一成不变的，而是根据作者组织段落的方法或强调的重点而定。大多数情况下，主题句在段首，有时会在段中或段尾。无论主题句的位置在哪儿，主题句都包含一个逻辑性强且层次分明的中心思想。 1．主题句在段首 这是主题句在段落结构中最常见的位置，这种安排开门见山，点出主题，读者可以迅速了解文章主旨。 [典例] Although smoking has been a popular habit for centuries，it has always had its enemies(主题句)．Some American Indians advised young braves not to smoke too much because tobacco would cut their wind(削弱力量)in a hunt or a battle.King James Ⅰ of England called smoking “a branch of the sin of drunkenness，which is the root of all sins”．Ben Johnson，the playwright，said smoking was“good for nothing but to choke a man and fill him full of smoke and embers”．Popular slang called cigarettes“coffin nails”long before the medical evidence on the hard from smoking was complete.Now every package of cigarettes and every advertisement for cigarettes must carry a warning from the Surgeon General(卫生局局长)that smoking is hazardous to health. 2．主题句在段中 主题句出现在段中时，位于主题句之前的部分通常起到承上启下的作用，而主题句后面的部 ... ...
