练习是课堂教学的重要环节 ,对教学效果会产生直接影响 .然而在当前教学改革中 ,人们关注的往往是教学目标、教学结构、教学方法、教学评价等的改革 ,而对习题的研究却容易被忽视 .练习不仅是巩固与检查课堂教学效果的重要手段 ,而且是知识转化为技能、培养学生思维品质的重要 Exercise is an important part of classroom teaching and has a direct impact on the teaching effect. However, in the current teaching reform, people are often concerned with the reform of teaching objectives, teaching structure, teaching methods, teaching evaluation, etc., while the study of the exercises is easy. Being neglected. Practice is not only an important means to consolidate and inspect the effects of classroom teaching, but also important to transform knowledge into skills and to cultivate students’ thinking quality.