Test analysis: This question mainly examines the students' ability to accurately interpret the information in the material. The words "Because we look all over China, we can't use others except Cai Yimin" in the materials show that Huang Kan has a positive attitude towards Cai Yuanpei's educational proposition. It can be seen from the historical facts that Cai Yuanpei, as the president of Peking University, actively advocates the policy of "freedom of thought and inclusiveness", so the answers are D and A, which advocate that education transcends politics, and B, which emphasizes that education follows the laws of nature.