If students don't have the desire to learn, all our plans, all our explorations and theories will fail." Improve the effectiveness of questioning, because effective questioning is the beginning of classroom dialogue, which can stimulate students' thinking and interest sparks. On the one hand, the effectiveness of the problem should have certain openness, on the other hand, it should have certain depth, on the other hand, it should pay attention to the level of students, so that students at different levels have thinking interests and thinking space