新课程标准认为,教学过程是开放的,不是封闭的;是生成的,不是预设的。一堂好课,应该是在师生共同交往中产生的思维的碰撞、意见的分歧、情感的交融等,从而让学生体验知识的生成,而非教师直接告诉学生是什么。通常教师在备课过程中往往会设计一整套方案或情境,通过预设让学生步步推进,使学生掌握知识。然而教师无论课前设计准备得多么充分,在实施教学的过程中,可能会有师生、生生意见的分歧,甚至出现一些意外或突发事件。如果为了完成教学任务,对此置之不 The new curriculum standards that the teaching process is open, not closed; is generated, not default. A good lesson should be the collisions of thinking, the disagreements of views, the blending of emotions, etc. in the common contacts between teachers and students, so that students can experience the generation of knowledge instead of the teacher directly telling the students what they are. Normally, teachers often design a set of programs or situations during lesson preparation. By default, teachers can make progress step by step so that students can acquire knowledge. However, regardless of the adequacy of teachers ’preparation for pre-lesson design, there may be disagreements between teachers and students, students’ opinions, and even some unexpected or unexpected incidents during the implementation of teaching. If in order to complete the teaching task, this is not set