OG8 阅读 Q37

Choice C is the best answer. The previous question asks which claim about the controversy over slavery would Lincoln agree with. The answer, that the controversy would abate if attempts to spread slavery to regions where it isn't practiced were abandoned, is best supported in the second paragraph of Passage 2: "Whenever [slavery] has been limited to its present bounds, and there has been no effort to spread it, there has been peace."
Choices A, B, and D are incorrect because the cited lines don't support the answer to the previous question. Instead, they discuss state-to-state differences in laws regulating issues other than slavery (choice A), assert that the differences among the various states generally benefit the nation (choice B), and ask a philosophical question that doesn't directly address the issue of slavery (choice D).