Analysis of test questions: Li Bai (71-762), who lived in the prosperous Tang Dynasty, was the most outstanding romantic poet in China after Qu Yuan, and was known as the "Poet Fairy". Du Fu (712-77), with beautiful words, lived in the historical period when the Tang Dynasty turned from prosperity to decline. His poems mostly involved social unrest, political darkness and people's sufferings, and were known as "the history of poetry". He is concerned about the country and the people, with noble personality and exquisite poetic skills, and is regarded as a "poet saint". Therefore, C meets the meaning of the question. ABC's analysis from the aspects of personality, origin and artistic skills is not convincing.
Comments: Social existence refers to the process of social material life, and its core is the mode of production of material materials. Social consciousness refers to the spiritual life process of society, and broadly refers to all the ideological elements and ideologies of people in society, including social psychology and social ideology; In a narrow sense, it refers to the consciousness of social relations, that is, ideology. Social existence is primary, which determines social consciousness, which reflects social existence and plays a role in promoting or hindering social existence. The question of whether social existence and social consciousness are primary is the fundamental boundary that divides historical materialism and historical idealism.