先学后教是通过学案或其他形式给学生呈现学习目标和预习内容的教学方式。它切实对学生的预习提出了较高的要求,对学习效率的提高起到了明显的作用,并最大限度地减少了课堂老师中不必要的讲授和漫无目的的指导。所以先学后教在很多学校开始流行,但是我们实践中也发现, First-aid is a teaching method that presents students with learning goals and prep-lectures through case studies or other forms. It effectively puts forward higher requirements for students’ preparation and plays an obvious role in improving the learning efficiency and minimizes unnecessary instruction and aimless guidance among classroom teachers. So after the first post-graduate teaching began to pop in many schools, but we also found in practice,