A. mental work

B. manual labor

C. combining education with productive labor and social practice

D. Combination of in-class and out-of-class

This question examines the examinee's grasp of the theoretical basis of China's educational purpose. The purpose of China's education is based on the Marxist theory of all-round development of human beings, and it is proposed that education is mainly to cultivate socialist builders and successors with "ideals, morality, culture and discipline" and all-round development of morality, intelligence, physique and beauty.

China's educational policy: education must serve the socialist modernization, and must be combined with productive labor to cultivate builders and successors of the socialist cause with all-round development in morality, intelligence and physique.

To achieve this educational goal, the fundamental and only way is to combine education with productive labor and social practice. Therefore, the answers to this question are C and B: mental labor and manual labor are relative and are two different aspects of labor quality.

Mental labor is mainly reflected in the scientific and cultural knowledge, production skills and experience of workers, while manual labor is labor with the motor system as the main motor organ of workers. Both of them are not the fundamental way to realize the educational goal of our country, and they are inconsistent with the topic, so they are excluded.

Item D: The combination of in-class and out-of-class is an educational concept advocated by school education and an important form of combining theory with practice. It is inconsistent with the stem of the question, so it is excluded.