说明文是以说明为主要表达方式的一种文章体裁,它通过客观地解说事物的形貌、构造、性质、特征、范围、类别、来源、成因、关系、功用等,来阐明事物的内容和形式、本质和规律,使人获得有关知识。说明文在现代社会生活中具有广泛的应用价值。因此,说明文也就成了中考语文现代文阅读测试的必选试题。 The explanatory text is an article genre based on the explanation as the main expression. It clarifies the content and form of things by objectively explaining the appearance, structure, nature, characteristics, scope, categories, sources, causes, relations, functions of things , Nature and law, people get the knowledge. Explanatory Notes in the modern social life has a wide range of applications. Therefore, the descriptive text has also become a necessary test for the modern Chinese reading test of the Chinese test.