笔者有幸参加了2015年南通市中考数学命题工作,命题组依据“遵循课标、紧扣教材、重视能力、贴近生活、控制难度”的命题原则,同时命制A、B卷。对于B卷第28题,命题组在试题立意、素材选取和试题打磨等各个环节都下足了工夫,现将命题过程予以呈现,与同仁交流。1试题呈现如图1,正方形OABC的边长为2,点A、C分别 I was lucky enough to participate in the 2015 Nantong City, mathematics proposition, the proposition group based on “follow the standard, closely linked to textbooks, attention to ability, close to life, control the difficulty of” proposition principle, while life A, B volume. For Volume B, Question 28, the proposition group in the test questions, material selection and test grinding and other links are all under foot work, now the proposition process to be presented, and colleagues exchange. 1 questions presented in Figure 1, the side of the square OABC 2, point A, C, respectively