【教学设计说明】“秒的认识”一课是在学生认识了时间单位时、分及其关系的基础上进行教学的。学生对秒的知识已有零星的经验积累,但学生对1秒或者几秒的时间观念缺乏具体体验及把握,所以建立1秒及几秒的时间观念,既是本课的重点,又是难点。教师在教学中要注重学生的直观体验,根据低年级学生心理特点及认知特点,挖掘学生已有的生活经验,一方面创设他们感兴趣的教学情境,引发学生探究的兴趣;另一方面,要 Teaching Design Description The second lesson is to teach students on the basis of time units, minutes and their relationship. However, students lack specific experience and grasp of the concept of time of one second or several seconds. Therefore, establishing concepts of time of one second and seconds is not only the focus but also the difficulty of this lesson. Teachers should pay attention to the students’ visual experience in teaching. According to the psychological characteristics and cognitive characteristics of the students in lower grades, they should find out the students’ existing life experience, create the teaching situations they are interested in, and arouse students’ interest in exploring. On the other hand, want