Bacon said: "The power of knowledge depends not only on its own value, but also on whether it is spread and the depth and breadth of its spread." This sentence

Analysis of test questions: Bacon's famous words in this material emphasize the importance of cultural exchange, not knowledge itself, so you can choose item B and exclude items A and D; The result of cultural exchange is also very important, so item C is incorrectly stated and cannot be selected. So, the answer is item B.