OG8 阅读 Q36

Choice B is the best answer. In the second paragraph of Passage 2, Lincoln asserts that the controversy surrounding slavery in the United States has died down whenever the institution of slavery has been restricted geographically: "Whenever it has been limited to its present bounds, and there has been no effort to spread it, there has been peace." Since Lincoln associates peace on this issue with geographical limits on the institution of slavery itself, it can be inferred that he would agree that the controversy would abate if all attempts to establish slavery in new regions ceased.
Choice A is incorrect because Lincoln neither urges Northern states to attempt to abolish slavery unilaterally nor implies that such an attempt would extinguish the controversy over slavery. Choice C is incorrect because Lincoln neither suggests that the laws regulating slavery are ambiguous nor that such ambiguity exacerbates controversy over slavery. Choice D is incorrect because Lincoln never attributes the controversy over slavery to differences in religion or social values from one state to another.