question: power on:power off
choices.label: A B C D
choices.text: get on:get off have a fever:medicine earthquake:escape enrollment:examination
explanation: "power on" and "power off" are parallel and completely complementary, and "on" and "off" have opposite meanings. "get on" and "get off" are juxtaposed, and "get on" and "get off" have opposite meanings. "fever" may need "medicine", "fever" and "medicine" are two different things. to "escape" in the event of an "earthquake". there is no obvious logical relationship between "enrollment" and "examination".
relation: power on power off R2.4
relation: get on get off R2.4
relation: earthquake escape R3.10