question: seesaw:balance
choices.label: A B C D
choices.text: shuttlecock kicking:harmonica throwing the handkerchief:magic slide:lever swing:pendulum
explanation: "seesaw" and "balance" have the same principle and are of the same kind. "kicking the shuttlecock" is a sport, and the "harmonica" is a musical instrument. "throwing the handkerchief" is a game; "magic" is a performance art, and the principles of "throwing the handkerchief" and "magic" are different. they are not the same. the principle of "slide" and "lever" is different. they are not the same kind. "swing on a swing" and "pendulum" have the same principle and are of the same kind.
relation: seesaw balance R2.4
relation: swing pendulum R2.4