Fei Zhengqing, a scholar, pointed out in his book China: Tradition and Change: "From Sui Dynasty to the early Tang Dynasty, there was also a breakthrough in system and culture". There are below

Test analysis: Based on the historical facts learned, the "breakthrough progress" of the political system in Sui and Tang Dynasties is mainly reflected in the implementation of the "three provinces and six departments" system. During the Sui and Tang Dynasties, the central government had three provinces and six departments: the central government was in charge of decision-making, drafting and issuing imperial edicts; The imperial edict of Zhongshu Province, if examined and approved, can be rejected and then handed over to Shangshu Province for execution. Shangshu Province has six departments, which are responsible for different functions. The three provinces have a clear division of labor and restrict each other, which weakens the relative power and ensures the exclusive respect of the monarch. So choose a.

Comments: The system of three provinces and six departments implemented in Sui and Tang Dynasties was a great creation of China's ancient political system. This topic can also be used to describe the operating mechanism of the three provinces and six departments system in Tang Dynasty. For example, during the period of Emperor Taizong, it was assumed that the country would build a large-scale transportation project, and the implementation of this project involved many institutions. According to the regulations of the system at that time, its operating procedures should be as follows

A. Shangshu Province → Zhongshu Province → Menxia Province → Ministry of Industry

B. Central Province → Menxia Province → Shangshu Province → Ministry of Industry

C. Menxia Province → Zhongshu Province → Shangshu Province → Ministry of Industry

D. Shangshu Province → Menxia Province → Central Province → Ministry of Industry