预习是一种超前性的学习,是学习过程中不可缺少的一个环节,它能培养学生的学习兴趣、自学能力和探索精神。教师要根据学生的不同情况对预习作业进行分层设计与布置,从而使各个层次的学生都能在原有基础上得到一定程度的提高和发展,使减负增效落到实处。 Preview is a kind of advanced learning, is an indispensable part of the learning process, it can develop students’ interest in learning, self-learning ability and exploration spirit. Teachers should according to the different situations of students to pre-arranged homework design and layout, so that students at all levels can be a certain degree of improvement on the original basis and development, so that burden reduction and efficiency implemented.