Analysis of test questions: this question belongs to negative multiple-choice questions, and the exclusion method should be adopted. A, C and D are the characteristics of trading places in Han Dynasty, and B is the characteristics of commodity markets in Song Dynasty, so B is chosen.

Comments: This question mainly examines students' comparative ability of what they have learned. The core knowledge point is that the commodity economy in Song Dynasty was divorced from the market. This phenomenon is not only the result of the development of commodity economy, but also greatly promoted the development of ancient commodity economy in China into a new period.