question: USB drive:CD
choices.label: A B C D
choices.text: stairs:elevator plug:socket chinese painting:brush water cup:cup lid
explanation: "USB drive" and "CD" are all data storage, except for "USB drive" and "CD" hard disk are also data storage. "stairs" and "elevator" are tools that can reach different floors "plug" and "socket" need to be used together, and "plug" and "socket" do not belong to the same category. to draw a "chinese painting", you need to use a tool like a "brush" "water cup" is a component of "cup lid", and "water cup" and "cup lid" do not belong to the same category.
relation: USB drive CD R2.4
relation: stairs elevator R2.4
relation: plug socket R3.10
relation: brush chinese painting R3.8
relation: cup lid water cup R2.3