一、案例背景曾经在我区一所乡镇中学听过一节公开课,由市里的一位名师上示范课(下面称为×老师)。内容是八年级上册第四章第一节《光的折射》。预备铃声响,学生走进教室,他们看到大屏幕上的图片、桌上的器材,很兴奋。上课铃声响,学生安静下来,这节课开始了……二、案例描述教师:同学们,今天我们开始新一章的学习,首先请大家看一组漫画。(漫画内容:第一幅画上有一口井,井底有一只青蛙,井边有一棵小树,此时,青蛙看不到小树。第二幅,下雨了,井里蓄了一些 First, the background of the story Once in our district a township high school heard an open class, the city by a teacher on the demonstration class (hereinafter referred to as × teacher). The content is the eighth grade fourth chapter first quarter “refraction of light.” When the bell is ready, the students walk into the classroom and they are excited to see the pictures on the big screen and the equipment on the table. Class bell rang, the students quiet down, the class began ... ... Second, the case description Teacher: Students, today we start a new chapter of learning, first of all, please see a group of comics. (Comic content: the first painting has a well, there is a frog bottom hole, a small tree near the well, at this time, the frog can not see the small tree. The second, it rains, the well built some