For questions 1 through 4, select two answer choices that (1) complete the sentence in a way that makes sense and (2) produce sentences that are similar in meaning.
Beat Generation works by Ginsberg and Burroughs led to obscenity trials, which led in turn to the _____ of rules governing what could be published in the United State.
在选项中只有D项liberalization（自由化）以及F项relaxation（消遣，松弛）是同义词，故本题选择DF两项。