question: in situ conservation:ex situ conservation
choices.label: A B C D
choices.text: car blowout:car oil leak flood control levee:green belts purebred breeding:cross breeding sales commission:share dividend
explanation: "in situ conservation" and "ex situ conservation" are two ways to conserve biodiversity, and "in situ conservation" and "ex situ conservation" are contradictory to each other. "car blowout" and "car oil leak" are car accidents, but in addition to "car blowout" and "car oil leak", there are other car accidents. "flood control levee" refers to a dam built to prevent river flooding, and "green belt" refers to a strip area that provides greenery. "pure breeding" and "cross breeding" are two ways to breed offspring, and "pure breeding" and "cross breeding" are completely complementary. the ways to get income include "sales commission" and "share dividend", but in addition to "sales commission" and "share dividend", there are other ways to get income.
relation: share dividend ex situ conservation R2.5
relation: car blowout car oil leak R2.6
relation: purebred breeding cross breeding R2.5