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一、课前思考《数学课程标准(2011年版)》在第二学段提出了“结合实例了解线段、射线和直线”的要求,而在第一学段并没有安排认识线段的内容。在几个主流版本教材中,苏教版教材在二年级上册“厘米和米”单元、人教版教材在二年级上册“长度单位”单元均安排了线段的初步认识,且都采用直观描述的方式说明线段的特征,都没有提到“端点”。北师大版教材没有在二年级上册安排这一内容,但是在“测量”单元的练习中,有的是直接测量“线”的长
First, pre-class thinking “Mathematical Curriculum Standard (2011 Edition)” in the second session of the “combination of examples to understand the line, ray and line ” requirements, and did not arrange the first paragraph of the line to recognize the content. In several mainstream version of the textbook, the Sujiao version of the textbook in the second grade on the volume “cm and meter ” unit, PEP textbook in the second grade on the volume “length unit ” unit are arranged for the initial understanding of the line, and are Using a straightforward description of the characteristics of the line segment, did not mention “endpoint ”. Beijing Normal University version of the textbook did not arrange this content in the second grade, but in the “measurement” unit practice, some are direct measurement of “line” length