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Exercise is beneficial to your heart. A 22-year study was conducted by doctors in California. They found that people who work at physical jobs experience fewer heart attacks than other people. These active people work all the time at moderate speeds，their daily routine gives them an adequate amount of exercise and helps them stay in shape.

“Exercise is beneficial”这是毫无疑义。但主题句中如不加上“to your heart”来加以control 和limit，那就流于空泛。因此，紧紧把握主题句中controlling idea导向和制约作用，是短文写作成功关键之一。

2、推展句

第四单元如何写推展句第八单元推展段落方法之一——事实与数据法
2.1、主要推展句

主要推展句（major supporting statement）主要特点是：围绕段落主题句展开每一个推展句本身都不要求作进一步说明或证明，句与句之间关系是相互独立又是互相连接。

例1：（主题句）There are several factors affecting climate.（推展句1）One factor is the mount of sunlight received.（推展句2）Altitude，or the height above sea level，also determines climate. （推展句3）The oceans have an effect on the climate of adjacent land.（推展句4）In addition，climate is influenced by the general circulation of the atmosphere.

主题句指出影响气候几个因素。然后用四个扩展句说明四种因素。第一种是太阳光接收量，第二种是海拔高度，第三句和第四句分别是海洋和大气环流因素。

2.2、次要推展句

次要推展句（minor supporting statement）是指对主要推展句作进一步事实分析和举例说明。它从属于某一个或某几个推展句。

例2：（主题句）I don’t teach because teaching is easy for me.（主要推展句1）Teaching is the most difficult of the various ways I have attempted to earn my living：mechanic，carpenter，writer.（主要推展句2）For me，teaching is a red-eye，sweaty-palm，sinking-stomach profession.（次要推展句1）Red-eye，because I never feel ready to teach no matter how late I stay up preparing.（次要推展句2）Sweaty-palm，because I’m always nervous before I enter the classroom，sure that I will be found out for the fool that I am.（次要推展句3）Sinking-stomach，because I leave the classroom an hour later convinced that I was even more boring than usual.

从属于主要推展句2三个次要推展句起着解释说明作用，分别解释red-eye，sweaty-palm，sinking-stomach含义，这就更加形象生动地证明了“teaching is not easy”这个主题。

2.3、主要推展句与次要推展句关系

主要推展句与次要推展句关系（relation）基本可以遵循下面“三部分”（three-part）规则。

1）、每个主要推展句都应该是对主题句中表示主要思想关键词直接、明确说明。

2）、每个次要推展句都应该说明它主要推展句。

3）、含有讨论说明或分析问题通常既要有主要推展素材，又要有次要推展素材。

2.4、写好推展句方法

主题句及关键词确定后，开始选择和主题有关信息和素材。实质上，针对关键词测试每一个所选择素材就是一个分类过程。有一种常用方法就是句子展开前加以设问，然后解答，即设问－解本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。