First of all, it is more affordable.

Second, teachers are strong.

Third, you can repeat reading and take care of students with poor understanding.

Fourth, it is convenient to preview and study in advance.

Fifth, there are many materials that are easy to understand.

disadvantaged

First, poor interaction is not conducive to the cultivation of thinking and emotion.

Second, it is easy to develop Internet addiction.

Third, the eyes are prone to myopia.

Senior four is easy to form the habit of copying answers without thinking, especially for students with bad habits.