This teacher's approach is right. There will be some unexpected events in class, including students' thoughts and behaviors. After the students ask questions, if they are different from the questions designed by the teacher, let the students know the questions. But we should also try our best to ensure the integrity and scientificity of the teaching content. If it is not a substantive question, don't answer the students' questions too complicated. We can also answer the questions of individual students after class.