教学引入是指教师在一个新的教学内容或教学活动开始时,引导学生进入学习境界的语言艺术与行为方式。常言道:“良好的开端是成功的一半。”精彩的引入会使学生如沐春风、如饮甘露,当学生对某种知识产生浓厚兴趣时,他们便会怀着期待、迫切的心情积极主动地投入学习,迅速的将兴奋中心集中到教学任务和教学内容上来,达到先声夺人,事半功倍的效果。《轴对称图形》是三年级第一学期第五单元中的一个教学内容,在此之前,学生已经学过一些平面图形的特征,形成了一定的空间观念,自然界和日常生活中具有轴对称图形性质的许多事物,也为学生的认知奠定了感性的基础,为此,教材在编写时,十分注重直观性和可操作性,本节课主要是帮助学生在 Teaching introduction refers to the teacher in a new teaching content or teaching activities at the beginning, to guide students to enter the learning realm of language arts and behavior. As the saying goes, “a good start is half the battle.” “The wonderful introduction will make the students feel like spring breezes and refreshing drinks. When students are keenly interested in certain kinds of knowledge, they will be expectant and enthusiastic To invest in learning, the center of excitement will quickly focus on teaching tasks and teaching content, to achieve the premeditated, with half the effort. ”Axisymmetric graphics" is a teaching content in the fifth unit of the first semester of the third grade, before the students have learned some characteristics of the plane graphics, forming a certain spatial concept, the axis of symmetry in nature and daily life Many things of nature, but also for students to establish a cognitive foundation, therefore, the teaching materials in the preparation, attaches great importance to the intuitive and maneuverability, this class is mainly to help students in