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课堂教学的中心问题是提高教学效率，及时、有效的练习是重要手段。实验证明，在知识点教学中，恰当掌握练习内容、练习时机可有效地提高学生成绩。设置练习应掌握恰当难度，符合学生认知水平。难度较大的题应设置梯度，使学生顺级而上，发展思维能力。练习还要掌握恰当密度，适应学生的思维规律和心理特点。
The central problem in classroom teaching is to improve teaching efficiency, and timely and effective practice is an important means. Experiments have shown that in knowledge point teaching, proper grasp of practice content and timing of exercises can effectively improve student achievement. Set up exercises to master the appropriate difficulty, in line with the students’ cognitive level. Difficult questions should be set gradients, so that students can order, develop thinking skills. Practice must also grasp the appropriate density to adapt to students’ thinking patterns and psychological characteristics.