在英语阅读和写作教学中，正确理解段落主题句，准确把握段落主题句的种类、位置，并掌握其扩展方法，对于提高大学生的英语阅读速度和写作能力大有裨益。

A better understanding of the varieties, positions and ways of development of an English topic sentence in a paragraph is beneficial to learners in improving their reading as well as writing skills.

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