中学语文课本人教版统编教材（必修）高中第一册第四单元———说明文，选编了一篇课内自读课文《一个好树种———泡桐》。这是一篇介绍泡桐功用的文章，采用“总———分”式结构布局谋篇，选择材料为突出泡桐特点，紧扣一个“好”字。在单元说明文教学中，这篇范文体现... Middle School Chinese textbooks textbooks for teachers (required) The fourth unit of the first volume of high school --- explanatory notes, selected a self-reading text in the class “a good tree species --- Paulownia.” This is an article introducing the function of Paulownia, using “total --- sub-” structural layout of the article, select materials for the prominent Paulownia characteristics, closely linked to a “good” character. In the teaching of unit instructional texts, this paradigm reflects...