question: purified water:filteration
choices.label: A B C D
choices.text: rank:competition house:renovate slim:diet environment:greening
explanation: "filtration" is the way to obtain "purified water", and "filtration" obtains "purified water" by decreasing impurities. "competitiont" is a way to obtain "rank", and there is no quantitative decrease in "competition" and "rank". one can "renovate" "house". going on a "diet" is a way to be "slim". "dieting" leads to "slimness", and "slimness" is achieved by "dieting", decreasing the amount of food intake. We can "green" the "environment".
relation: filteration purified water R3.10
relation: competition rank R3.10
relation: renovate house R4.2
relation: diet slim R3.10