I. Knowledge card

Choose a.

Second, practice after class

1、A .

2、D .

3、ABCD .

4、D .

5、ABCD .

6、D .

Introduction:

Youth University is an online course video. Students don't have to go to the classroom to study, but only need to study with their mobile phones in the dormitory. However, although the learning style of youth universities is more casual, it does not mean that there are no requirements. Some students may want me to turn on my cell phone, so leave it alone. This idea is wrong in itself, and more importantly, there are problems in implementation.

On the one hand, although it is a video, there will be random questions in young universities. If the viewer doesn't answer these questions, the video will not continue to play, so it is impossible to play it directly on the mobile phone, no matter how people brush it.