question: light:shadow
choices.label: A B C D
choices.text: vibration:sound hurricane:loss effort:success alcohol:atmosphere
explanation: to have "shadows", there must be "light", and "light" is a necessary condition for "shadows". to have "sounds", there must be "vibration", and "vibration" is a necessary condition for "sounds". "losses" may be caused by a "hurricane". "hurricane" is not a necessary condition for "losses". "success" may require "efforts". "efforts" is not a necessary condition for "success". there is no obvious logical relationship between "alcohol" and "atmosphere".
relation: shadow light R5.4
relation: sound vibration R5.4
relation: hurricane loss R3.10
relation: effort success R3.10