一堂好课必然有一段好的新课引入,但精彩的引入未必能促成整堂好课。在高中物理教学中,经常会遇见这样的情况:教师展示了一个新课引入情景(实验、图片或录象资料),学生为之兴奋,课堂气氛顿时活跃。但随着教学进程在形成物理概念的时 A good class must have a good new class introduced, but the wonderful introduction may not be able to contribute to a good class. In high school physics teaching, it is often the case that a teacher shows a new lesson in a scene (experiment, picture or video) where students are excited and the classroom atmosphere is suddenly active. But as the teaching process is forming a physical concept