Guiyang's should be PEP version A. The most important thing is the difference in difficulty. Because China has a vast territory and a large population, and there are great differences in politics, economy, education and culture between the north and the south. Considering the differences in the actual teaching level and students' educational foundation in different places, the Ministry of Education basically divides the national candidates into three regions: A, B and C. The candidates in Region A mainly come from developed regions, such as Beijing, Shanghai, Tianjin and Guangdong. According to the examination division of regional education level, the corresponding Ministry of Education also distinguishes the difficulty of teaching materials. Where education is backward, people's education version A is used, while version B is relatively backward. This is a policy that takes into account the unbalanced development level of education between North and South, and at the same time ensures the fairness and justice of candidates' examinations.