当前课堂教学变革的目的是进一步转变教师的教学观念和教学方式,真正确立学生主体地位,改变课堂教学面貌,优化课堂模式,促进学生有效学习,提高课堂教学的实质效果。利用以“三卡”为载体的先学后教式教学模式要求教师要从主演变为导演,从帮助学生学会学习出发,按照从易到难,从表面到本质,从一般到特殊的认识规律,有层次的设计好预习卡、作业卡、导学卡,培养学生自主学习、合作学习、探究学习的能力。从而改变以往课前 The purpose of the current classroom teaching reform is to further change the teachers ’teaching concepts and teaching methods, to truly establish the student’s dominant position, to change the appearance of classroom teaching, to optimize the classroom model, to promote students’ effective learning and to improve the substantive effect of classroom teaching. The use of “three cards ” as the carrier of the first post-secondary teaching mode requires teachers to change from the protagonist to director, starting from helping students learn to learn, according to from easy to difficult, from the surface to the essence, from general to special Understand the law, the design of a good level preview cards, assignment cards, guide cards, students develop their own learning, cooperative learning, learning ability. Thus changing the previous lesson