question: Chang'e-2:lunar exploration
choices.label: A B C D
choices.text: cosmetic:beauty instant noodle:keep warm coffee:sleep key:door lock
explanation: "Chang'e-2" can be used for "lunar exploration". "cosmetics" can be used for "beauty". "instant noodles" cannot be used to "keep warm". "coffee" can be used to refresh, not for "sleep". the "door lock" is opened with a "key", and the "key" cannot be used for the "door lock".