question: light:brightness
choices.label: A B C D
choices.text: battery:current speakers:music mobile phone:sms computer:text
explanation: the "light" will emit "brightness" when it is powered on, and the original function of the "light" was to emit "brightness". the "battery" can directly generate "current" without the aid of external objects. the "speaker" can play "music", and the original function of the "speaker" was to play "music". "mobile phone" can send "sms", but sending "sms" is a derivative function of "mobile phone", and the original function of "mobile phone" is to make calls. "computer" can edit "text", but editing "text" is a derivative function of "computer", and the original function of "computer" is to process data.
relation: light brightness R3.3
relation: speakers music R3.3
relation: mobile phone sms R3.3
relation: computer text R3.3