一、教材分析本节内容是人教版七年级上册第二单元中的第四章,所学习的病毒是学生学习的生物体中最特殊的一种形式且与生活联系非常紧密。因此,在教材中占据着重要的地位。根据教材的安排,第二单元首先认识了细胞,了解了细胞的基本结构,然后安排了细胞如何构建生物体,从多细胞生物和单细胞生物的角度阐述细胞是构建生物体结构和功能的基本单位;随后教材安排了本章内容,让学生认知病毒,掌握结构简单、不能 First, the textbook analysis This section is the fourth chapter of the seventh edition of the second edition of the PEP, the virus is learning is the most special form of learning organisms and life is very close. Therefore, the textbook occupies an important position. According to the textbook arrangement, the second unit first met the cells, understand the basic structure of cells, and then arranged how the cells build organisms, from the perspective of multicellular organisms and unicellular organisms is the basic structure and function of building organisms Unit; Then the textbook arranges this chapter content, lets the student cognize the virus, masters the simple structure, can not