“承认差异,尊重个性,给每一位学生以充分的发展空间”是《数学课程标准》提倡的一条基本理念．给学生以更多的自主性,让不同类型、不同层次的学生尽可能地展示自己的数学才能是中考命题的新原则．这一原则在2005年各地中考试题中较好地体现了出来．很多省市的中考试卷中出现了选做型试题,这类试题涉及到所有知识点,本文举例说明． “Acknowledging differences, respecting individuality, and giving each student sufficient room for development” is a basic concept advocated by the “Mathematics Curriculum Standards.” To give students more autonomy, so that students of different types and levels can demonstrate their mathematical ability as much as possible is the new principle of the proposition test. This principle was better reflected in the 2005 examination questions. In many provinces and cities in the examination papers, there are selective examination questions. This kind of questions involves all knowledge points. This article gives an example.