Test analysis: "Its function will make people's thoughts and behaviors respect rationality, but superstition will be reduced, and ignorance will make people's thoughts free and progress" shows that the slogan of science is conducive to people's ideological liberation and progress, A is content, BD can't reflect it, so C is chosen.

Comments: China intellectuals were baptized by western democratic and scientific thoughts in the New Culture Movement. This paved the way for the spread of new ideas.