我认为,理科教师的“扩展能力”应表现在以下几个方面: 1.能够处理日益增多的信息,妥善安排,并不断开发课程内容。教师确定教学内容的一个依据是现成的教科书。但是教师不能在课堂上照本宣科。理科教师要深刻理解本学科知识的基本结构,能够抓住基础知识内容,使学生重点掌 In my opinion, science teachers’ “ability to expand” should be manifested in the following aspects: 1. Being able to handle increasing amounts of information, make proper arrangements, and continuously develop course content. One basis for teachers to determine teaching content is ready-made textbooks. But teachers can not copy the textbook in class. Science teachers should have a profound understanding of the basic structure of the subject knowledge, to grasp the basic knowledge of content, so that students focus on the palm