question: water surface:mirror
choices.label: A B C D
choices.text: brush:pen cane:rope drawing:photo torch:electric light
explanation: both "water surface" and "mirror" have the function of reflecting light. "water surface" is natural, and "mirrors" belong to artifacts. both "brush" and "pen" can provide the function of writing, and both are man-made objects. both "cane" and "rope" can provide the function of binding. "cane" is a natural thing, and "rope" is an artifact. the two do not belong to the same species. both "drawings" and "photos" can provide the function of recording, and both are man-made objects. both "torches" and "electric lights" can provide the function of lighting, and both are man-made objects.
relation: water surface mirror R3.10
relation: cane rope R3.10