The weather has been changeable. On Sunday we had a high wind that blew down some trees. Monday was so cold that we had to turn on the heat and wear out winter coats. On Tuesday we formed a group to go roller skating. By Wednesday the weather cleared and the sun came out. Thursday was as hot and humid as an August day. Friday morning it began to rain，and it looks as if well have a cold，steady wind for a few days.

这一段写最近天气多变，首句为主题句。扩展句叙述了星期日、星期一、星期三、星期四和星期五的天气情况，用以展开关键词changeable.但星期二没有提天气，而是说当天的活动安排，偏离了主题，打断了段落叙述的连贯性，破坏了段落逻辑意义的统一性，应删去或改为与天气有关的话。

再如：

Sports benefit us in many respects. When taking part in sports，we get the chance to train almost all parts of our body. There is no doubt that properly balanced physical activities keep us physically fit. Furthermore，sports can enrich our life and maintain our psychological health. Through participation，everyone can learn that on the playing field he not only competes for himself but also for his team. Sports teach us about consideration，cooperation and optimism，and how to cope with difficulties.

第一句是本段的主题句，接下来作者从体育运动对身体的好处说了两句，第四句讲述体育运动对心理方面的益处，第五句从团队的方面加以论述，最后一句既是论据，同时也是对前面三点的概括。全段没有一句话脱离主题句。

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