question: travel:transportation
choices.label: A B C D
choices.text: life:work eat:food sleep:rest rehabilitation:recovery
explanation: to "travel", there must be "transportation", and "transportation" is a necessary condition for "travel". "work" is an integral part of "life", but not essential. to "eat", there must be "food", and "food" is a necessary condition for "eating". "sleep" is a type of "rest". "rehabilitation" refers to recovering health, "recovery" refers to getting well, "rehabilitation" and "recovery" have similar meanings.
relation: travel transportation R5.4
relation: eat food R5.4
relation: sleep rest R2.2
relation: recovery rehabilitation R1.1