动态生成的课堂需要教师因势利导,对学生出现的良好资源制订对策,进行精心的整合、开发。那么,怎样在“预设”和“生成”中达到平衡,生成有价值的教学内容呢?基于此,笔者结合自己平时的教学实践,并以《了解空气》一课为视角,展开剖析,旨在探索有效策略,切实优化课堂教学。 The dynamically generated classrooms require teachers to make the best use of their strengths and formulate countermeasures for the good resources that students emerge to carefully integrate and develop. So, how to achieve the balance between “Preset ” and “Generate ” to generate valuable teaching content? Based on this, the author combines his usual teaching practice and takes the lesson of “understanding the air” Anatomy, aimed at exploring effective strategies to effectively optimize the classroom teaching.