课堂教学时间是有限的,那么学生在课堂开展的研究活动就会存在一定的局限性,学生的主动性和创造性也会受到限制,所以说单单依靠课本内容并不能让学生更多、更好地认识周围的自然事物,学生的各种能力也得不到充分锻炼和发展。而学生在课外的时间较多,接触的自然事物也更广泛,可以根据不同的兴趣,按照自己的方法进行研究,所以说课外括动是教学中不可忽视的内 Classroom teaching time is limited, then students in the classroom research activities there will be some limitations, students' initiative and creativity will be limited, so that relying on textbooks alone will not allow students to more and better Understanding of the surrounding natural things, the students' abilities are not fully exercised and developed. However, students spend more time outside of class and are exposed to a wider range of natural things. They can study according to their own interests according to different interests, so that extra-curricular activities can not be ignored in teaching