一、教学背景 :“物体分类”是北师大版第一册第64页的内容 ,要求学生对长方体、正方体、圆柱、球有一定的感性认识 ,知道这些几何体名称并能识别。本节课是学生对这些物体的初步认识 ,是学生学习几何图形的开始 ,在学习这之前学生在他们的生活中已经积累了许多关于长方体、正 First, the teaching background: “Object Classification” is the first page of Beijing Normal University version on page 64, requiring students to have a certain perceptual knowledge of the cuboid, cube, cylinder, the ball, know these geometry names and can identify. This lesson is a student's initial understanding of these objects is the beginning of student learning geometry, before learning this student in their life has accumulated a lot about the cuboid, is