预习的主要目的有三个：一是初步了解新课的大概内容，对即将学习的内容思想上有准备；二是运用已有的知识和技能，解决一些能独自解决的新问题，同时又起到巩固旧知的作用；三是发现自己不能解决的问题，带着问题听课，增强求知欲望，提高学习效率。预习，是培养学生素质的重 The main purpose of the preview are three: First, an initial understanding of the contents of the new course, the content of the upcoming learning ideological preparation; the second is to use existing knowledge and skills to solve some new problems can be solved alone, but also play Consolidate the role of the old knowledge; third is to find that they can not solve the problem, with questions to lectures, enhance knowledge and desire, improve learning efficiency. Preview, is to train the quality of students