question: discount:promotion
choices.label: A B C D
choices.text: programming:language review:exam experimental:study practice:truth
explanation: "discount" is a means of "promotion". "programming" is a formal language used to define computer programs, and "programming" can modify "language". "review" is to prepare for an "exam", not the way of "exam". "experiment" is a means of "research". "practice" is the only criterion for testing "truth", and "practice" and "truth" do not belong to the correspondence of methods.
relation: discount promotion R3.10
relation: programming language R4.3
relation: review exam R3.10
relation: experimental study R3.10
relation: practice truth R3.10