一、前置性练习了解学生,正确把握学习起点,是前置性练习的目标和价值所在。美国心理学家奥苏伯尔说的这句话是很有道理的:“影响学习的最重要因素是学生已经知道了什么,我们应当根据学生原有的知识状况去进行教学。”在这节课的教学中我设置的前置性练习是结合预习作业在导入新课后用三分钟做的一个环节,课前我给学生设计了一个表格检查巡视表格填写的情况,表格如下: First, the pre-practice to understand the students, a correct grasp of the starting point is the goal and value of pre-practice. This statement from Auspubil, a psychologist in the United States, makes sense: “The most important factor affecting learning is what the students already know and we should teach according to the students’ original knowledge.” The pre-practice exercises I set in the teaching of this lesson is a link that I took three minutes after I started the new class with pre-assignments. Before the class, I designed a form for the students to check the filling of the inspection form as follows: