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例1 In rock music there is a distinct and almost overwhelming beat.No single beat is characteristic of the music today. But each song has an easily recognizable rhythm.As you listen to a son9，your foot usually starts to pick up the beat.Before lon9，your entire body seems to be moving with it.Your head pounds with the beat，and there is no room for thought.Only the surge of the music is important.In its own way，rock music is as dominant as the rock Gibraltar. Its message is an evergrowing emotional one. 在这一段文章中 In rock music there is a distinct and almost overwhelming beat. 为主题句。beat则是句子的信息核心。该词在第2、4、6句里重复出现，而第3句中的rhythm跟beat意思基本一致，这就保证了主题平稳而持续的发展。请注意：第8、9句作者重申并总结了主题句，而不是说段末是主题句。 例2 The vegetable and fruit and flower merchants are surrounded by baskets of purple eggplants， green peppers，strings of tiny silvery onions，heads of bitter Indian spinach.and a dozen Indian vegetables for which I dont even know the English names.I had forgotten about the profusion of fruit in Indiait is only during the brief intense summer that you see much variety of fruit in Moscow. In Russia，as winter approaches all vegetables except for potatoes and the pervasive cabbage in soup seem to disappear from the menus. | 
