Test analysis: "Modesty and prudence" means that a person has good ideological and moral cultivation, "With modesty and prudence, the gem of wisdom will be more dazzling", which shows that good ideological and moral cultivation is conducive to promoting scientific and cultural cultivation. B correct; A has nothing to do with the meaning of the question; C is wrong; D does not meet the meaning of the question.

Comments: This question examines students' understanding of the relationship between scientific and cultural cultivation and ideological and moral cultivation. It is necessary to accurately interpret the meaning of the topic and the role of ideological and moral cultivation embodied in the topic in scientific and cultural cultivation. Only by grasping this theme can we make the right choice. It is more difficult.