课堂教学是预设与生成、封闭与开放的矛盾统一体。难以想象,教者准备仓促,备课马虎,课上能出现必须达到的精彩;也难想象,只是按图索骥,实施教案,课上能形成出人意料的精彩。可见,精彩的课堂教学应该是教者智慧释放和学生潜能放飞的有机融合,应该是教者课前精心准备与课堂相机调 Classroom teaching is the unity of contradiction between presupposition and formation, closure and opening. Unimaginable, teachers prepare to rush, preparation sloppy, class can have to achieve the wonderful; it is hard to imagine, just according to the plan, the implementation of lesson plans, classes can be formed surprisingly wonderful. Visible, wonderful classroom teaching should be the organic integration of the wisdom of the release of teachers and the potential of students to fly, it should be carefully prepared before the class teacher and class camera