question: persistence:breakthrough
choices.label: A B C D
choices.text: learning:development agreement:argument inheritance:innovation unity:competition
explanation: "breakthrough" is achieved because of "persistence". "development" is achieved because of "learning". there is no obvious logical relationship between "agreement" and "argument". "inheritance" and "innovation" are close in meaning. "unity" and "competition" have no obvious logical relationship.
relation: persistence breakthrough R5.1
relation: learning development R5.1
relation: inheritance innovation R2.4