详解
Choice D is the best answer. The author of Passage 2 states that people like novelists and scientists improve in their profession by "immers[ing] themselves in their fields"(line 79,"immerse...read"). Both novelists and scientists, in other words, become absorbed in their areas of expertise.
Choices A and C are incorrect because the author of Passage 2 does not suggest that novelists and scientists both take risks when they pursue knowledge or are curious about other subjects. Choice B is incorrect because the author of Passage 2 states that"accomplished people" don't perform "intellectual calisthenics," or exercises that improve their minds (lines 77-78,"Accomplished...calisthenics").