1. First of all, ask questions according to the key and difficult points of teaching. If you ask questions aimlessly, you will miss the main task of classroom teaching. Even if the selected questions are wonderful, the teaching effect will not be achieved.

2. Secondly, questions should be suspicious and fascinating, and the difficulty should be controlled within the range that students can answer after some thinking.

3. Finally, the questions should be interesting and attractive, and try to choose some attractive and interesting questions.