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一、教材分析 《认识物体和图形》这部分内容包括立体图形（长方体、正方体、圆柱和球）和平面图形（长方形、正方形、三角形和圆）的初步认识,是学生学习“空间与图形”知识的开始。教学这部分内容的目的是让学生直观认识各种图形、感受各种图形的特征,培养学生的初步观察能力、动手操作能力和交流的能力。在立体图形的初步认识中,教材从生活着手,引出教学内容,让学生把形状相同的物体放在一起。接着,教材通过列表的方式让学生学会辨认和区别四种立体图形。对于每一种图形都按
First, the textbook analysis of “Understanding objects and graphics” This part includes the initial understanding of the three-dimensional graphics (cuboids, cuboids, cylinders and balls) and plane graphics (rectangles, squares, triangles and circles), students learn “space and graphics” s begin. The purpose of teaching this part of the content is to enable students to intuitively recognize a variety of graphics, feel the characteristics of various graphics, develop students' initial observation skills, hands-on ability and communication skills. In the initial understanding of stereoscopic graphics, textbooks start from life, leads to teaching content, so that students put objects of the same shape together. Then, the textbook through the list of ways for students to learn to distinguish and distinguish four kinds of three-dimensional graphics. Press for each graphic