A western thinker, out of concern for the fate of the country and people, devoted himself to the study of mankind itself, that is, the study of human ethics. Let philosophy "fall from the sky"

Analysis of test questions: This question examines the origin of western humanism. The answer can be inferred from the material information of "returning philosophy from the sky to the earth". One of Socrates' contributions is to make philosophy a "human" knowledge. Therefore, the correct option is that the contribution of item A to philosophy is to develop into an independent discipline; The CD item is a Renaissance writer.