传统课堂教学的一个重要特点是教师有充分的预设,然后通过自己的教学经验和教学机智来引导学生进入自己的预设,从而达到顺利完成教学任务的目的。但课堂教学是千变万化的,再好的预设也不可能预见课堂上可能出现的所有情况,更多的时候我们都会突然遭遇和预设相距甚远的动态生成。在这种情况下,我们教师就要依靠自身的机智和科学底蕴,充分利用这些课堂动态生成的资源,提高科学课堂教学的教学效果。 An important feature of traditional classroom teaching is that teachers have sufficient presuppositions, and then through their own teaching experience and teaching tactics to guide students into their own presets, so as to achieve the successful completion of teaching tasks. However, classroom teaching is ever-changing. Even the best presets can not anticipate all the situations that may arise in the classroom, and more often we suddenly encounter dynamically generated and preset far away. Under such circumstances, our teachers rely on their wit and scientific heritage to make full use of the resources dynamically generated in these classes to improve the teaching effect of science classroom teaching.