备课是教师的常规性活动,俗话说,有备无患。教师备好课是上好课的基础和关键,如果备课无效或者低效,教学就必然无效。然而,目前我国中小学教学中仍然存在着一个非常突出的问题,那就是:教师很辛苦,学生很痛苦。一方面大量繁杂而无效的备课占用了教师的时间和精力,让教师疲于奔命,工作辛苦;另一方面因为课堂教学效率的低下 Preparation lesson is a teacher’s regular activities, as the saying goes, be prepared. Teachers prepare a good lesson is the basis and key, if the lesson is invalid or inefficient, teaching inevitably ineffective. However, at present, there is still a very prominent problem in the teaching of primary and secondary schools in our country: teachers are very hard and students are very painful. On the one hand, a large number of complicated and inefficient lesson preparation takes up the teacher’s time and energy, let the teacher exhausted, hard work; the other hand, because of inefficient classroom teaching