question: erode:weaken
choices.label: A B C D
choices.text: compress:obey unite:purify increase:expand persist:improve
explanation: "erode" and "weaken" have similar meanings. there is no obvious logical relationship between "compress" and "obey". there is no obvious logical relationship between "unite" and "purify". "increase" and "expand" have similar meanings. there is no obvious logical relationship between "persist" and "improve".
relation: erode weaken R1.1
relation: increase expand R1.1