Gong Zizhen, a thinker in the late Qing Dynasty, once said: "To destroy a country, we must first go to its history." The enlightenment from this is: a. We should promote the development and prosperity of cultures in various countries. B

Test and analysis: "If a country is destroyed, its history must be destroyed first" means that if another country is destroyed, its history must be destroyed first. It enlightens us that to develop our country, we must respect our national culture and cultivate and develop it well. B is correct; ACD does not meet the problem.

Comments: This question examines students' understanding of the requirement of respecting cultural diversity. The correct answer can be obtained by judging the purpose and meaning of the question, but the question requires students' understanding ability and is difficult.