案例背景:加数学校本教研——教师课堂展示活动中,我执教了北师大版四年级上册《线的认识》一课。主要过程呈现:师:今天,我们要认识一位图形朋友“线”(板书:线)。你在生活中哪里看到过线?(学生说一说)它躲在屏幕上的这些物体中,你能把它找出来吗?(生汇报,师点击)边找边电脑显示。1.抽象出线师:现在我们把它请出来。(电脑隐去实物,留下线) Case Background: Addition to the number of school-based teaching and research - teacher classroom show activities, I coached the fourth grade of Beijing Normal University Volume “line of understanding” a lesson. The main process is presented: Teacher: Today, we have to meet a graphic friend “line ” (blackboard: line). Where do you see the line in your life? (Students say) Hide it in these objects on the screen. Can you figure it out? 1. Abstract qualifier: Now let’s get it out. (Hidden computer in kind, leaving the line)