Analysis of test questions: ① It does not conform to the meaning of the question, and it is concrete and conditional that the material does not involve truth. (2) Does not meet the meaning of the question, and the knowledge not involved in the materials is repeated. The more you know, the bigger the circle, and the more you don't know. The more you know, the bigger the circle, and the more you don't know. Therefore, keep ③ ④ and choose D.

Comments: This kind of examination requires students to master the constant pursuit of truth in practice. Truth is the correct reflection of objective things and their laws. Truth is objective, concrete and conditional. Cognition is repetitive, infinite and rising. People's understanding is a wave-like progress and a spiral rise. Methodology: Keeping pace with the times, pioneering and innovating, understanding and developing truth in practice, testing and developing truth in practice are our unremitting pursuit and eternal mission. The difficulty of this question is moderate, and the ability of students to analyze according to book knowledge and materials is examined.