OG8 阅读 Q41

Choice D is the best answer. In the second paragraph of Passage 1, Douglas asks the rhetorical question: "why cannot this Union exist forever, divided into Free and Slave States, as our fathers made it?" The remainder of the paragraph amounts to an answer to this rhetorical question and a refutation of Lincoln's viewpoint on slavery, as represented by Douglas. In the second paragraph of Passage 2, Lincoln asks a series of rhetorical questions: "But has it been so with this element of slavery? Have we not always had quarrels and difficulties over it? And when will we cease to have quarrels over it?" These questions imply that there are flaws in Douglas's equating the division into slave states and free states with other, more unambiguously beneficial differences from state to state. The remainder of the second paragraph expands on these flaws. Therefore, it can be said that in context, the rhetorical questions asked by each speaker serve to undermine the argument of the other speaker.
Choice A is incorrect because in asking rhetorical questions, neither Douglas nor Lincoln casts doubt on the sincerity of his opponent. Choices B and C are incorrect because although Douglas and Lincoln find fault with each other's ideas, they don't criticize each other's methods (choice B) or reproach each other's actions (choice C).