【案例一】这是一节教一年级学生学翻“前滚翻”的课。教学这节课的是一位具有丰富教学经验的教师。新课伊始,教师将该校仅有的一张海绵垫放置在操场中央,海绵垫的周围马上便围上了一群啁啁啾啾的学生。按照惯例,在做完准备活动之后,教师应该讲解前滚翻的动作要领,然后教师示范 [Case one] This is a section to teach first-year students to learn turn “roll” class. Teaching This lesson is a teacher with rich teaching experience. At the beginning of the new class, the teacher placed the only sponge pad in the center of the playground and immediately surrounded them with a group of chirp students. In accordance with established practice, after completing the preparatory activities, the teacher should explain the essentials of the roll-over action, and then teachers demonstrate