question: water:forest:coal
choices.label: A B C D
choices.text: nitrogen:protein:intelligence lightning:rain:hold an umbrella snow:bumper year:delightful praise:confidence:optimism
explanation: to have a "forest" there must be "water", and to have "coal" there must be "forest". "proteins" all contain the "nitrogen" element, and "proteins" are necessary to develop "intelligence". the necessary condition for "rain" is not "lightning", the necessary condition for "holding an umbrella" is not "rain", and it is also possible to "hold an umbrella" on sunny days. The necessary condition for a "bumper year" is not "Snow". A "bumper year" can make people feel "joy". The necessary condition for "joy" is not "bumper year". "Praising" others can make people feel "confident", but the necessary condition for "confidence" is not "praise", and the necessary condition for "optimism" is not "confidence".
relation: water forest R5.4
relation: forest coal R5.4
relation: nitrogen protein R5.4
relation: protein intelligence R5.4