《全日制义务教育科学(3～6)年级课程标准(实验稿)》明确提出:“学生是科学学习的主人”,“教师是学习活动的组织者和引导者”。这些表述强调科学课教学过程应是师生交往、共同发展的互动过程。在这个过程中,教师为主导、学生为主体是一种辩证的统一。但是,如何在40分钟的课堂 Full-time Compulsory Education Science (Grade 3 ~ 6) Curriculum Standards (Experimental Draft) clearly states that “students are the masters of science learning” and “teachers are the organizers and guides of learning activities”. These statements emphasize that the teaching of science class should be an interactive process of teacher-student interaction and common development. In this process, teachers are dominant and students as the main body are a dialectical unity. But how to get in 40 minutes of class