Analysis of test questions: "Danger" and "opportunity" are unity of opposites and a pair of contradictions. Contradiction is the unity of opposites. Difficulties and prosperity in "how difficult it is to prosper the country" If you don't take refuge, the difficulty and the difficulty in knowing the difficulty are the unity of opposites. Therefore, this question chooses item B. Item 23 does not conform to the meaning of the question and should be excluded.

Comments: Philosophical questions often examine the philosophical truth contained in famous sayings, proverbs and ancient poems. It is also a question that is often examined in the college entrance examination. To do this kind of problem, one is to understand the meaning of the material. The second is to find the corresponding point, that is, to find the philosophical truth corresponding to the material. The difficulty of this question is moderate.