Just because you don't want to hear it. A similar situation was found in the teaching practice. In a class of a high school with a total of 10 hours of teaching, the number of students who asked the teacher for the courseware after class was 19, mainly focusing on six students, it was found that the 6 students frequently appeared the behavior of not listening to lectures and losing their minds in class. Such "sleep in class, make up after class" behavior is obviously not welcome in multimedia teaching, and regardless of whether students can really spend time after class to study the course from beginning to end, only by students after-class self-study effect is far less than in class with students, teachers interactive learning effect can be seen that such a way is not conducive to students'learning.