question: chalk:blackboard
choices.label: A B C D
choices.text: mouse:keyboard skate:runway key:gate battlefield:general
explanation: "chalk" is written on the "blackboard", "chalk" corresponds to the "blackboard", and the two are used together. both "mouse" and "keyboard" are external devices of the computer, and "mouse" and "keyboard" are in the same category. "blade" is a tool used for skating. the "blade" slides on the "runway", and the "blade" corresponds to the "runway", and the two are used together. the "key" and the lock have a matching relationship and can act on the "gate", which is inconsistent with the logical relationship of the query. the "general" commands operations on the "battlefield", and the two belong to the correspondence between characters and places.
relation: chalk blackboard R3.10
relation: mouse keyboard R2.4
relation: skate runway R3.10
relation: key gate R3.10
relation: general battlefield R3.10