在教学实践中,我们发现不少学生对老师设计的练习一点没有兴趣,究其原因:一是无从下笔,造成思维的障碍;一是司空见惯,不能引起兴趣。因此,练习设计必须符合学生的心理。大而言之,就是要遵循以下三条原则。一、共同要素的原则老师设计练习的目的,是为了掌握学生 In teaching practice, we found that many students are not interested in the practice of teacher design. The reasons are as follows: First, they can not write down and cause obstacles in their thinking. First, they are commonplace and can not arouse interest. Therefore, the practice design must be in line with the student's psychology. In large terms, it is necessary to follow the following three principles. First, the principle of common elements The purpose of teacher design exercises is to master the students