科学教材不是教学范本,更不是教学内容的全部,而只是教学的凭借和依托。教材只能作为教学的参考,教师备课和教学的资源来自教师已有的知识结构、网络媒体及广阔的社会生活。科学教师要善于依托教材,进行适当的拓展延伸。在教材内容上拓展延伸每一课的拓展延伸都是有针对性的,都 Teaching materials is not a model of teaching, but not all of the teaching content, but only by virtue of teaching and relying on. Teaching materials can only serve as a reference for teaching, teachers prepare lessons and teaching resources from the teacher’s existing knowledge structure, online media and a broad social life. Science teachers should be good at relying on teaching materials, to extend the appropriate expansion. In the textbook content to expand the extension of each lesson is an extension of the extension, are