高中生物学内容本是一个完整的知识体系。为了便于教学,我们分了章和节。同学们在学习时,免不了产生两个问题:一是对于每个章节孤立地学习,不能主动联系为一个整体;二是对于一些复杂的章节,孤立学习增加了学习的难度。针对上述问题,笔者通过多年教学实践,总结出了有针对性的教? High school biology content is a complete knowledge system. In order to facilitate teaching, we divide chapters and festivals. When students are learning, it will inevitably lead to two problems. First, for each chapter to learn in isolation, it is not possible to actively connect as a whole; Second, for some complex chapters, isolated learning increases the difficulty of learning. In view of the above problems, the author has learned from many years of teaching practice that there are targeted teachings.