人教版教材把垂直与平行安排在一起学习,有利于学生从结构上整体认识同一平面内两条直线的位置关系。而北师版教材是把《平移和平行》作为一个课时呈现的,目的是让学生学了线的有关知识后,认识一组线之间的关系。在这以前,学生已经学习了物体的运动方式:平移和旋转。教材突破以往仅仅依靠直接观察得出平行线概念的做法,将平 PEP textbooks arrange vertical and parallel learning together, which helps students to understand the overall structural relationship between two straight lines in the same plane. The Beijing Normal Edition textbook is the “translation and parallel” as a class presented, the purpose is to enable students to learn the line of knowledge, to understand the relationship between a set of lines. Until now, students have learned how objects move: pan and rotate. Breakthrough in teaching materials in the past rely solely on direct observation of the concept of parallel lines derived from the practice will be flat