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趣找答案
21.What do Light-Up Greeting Cards and Campus Emergency Response Kits have in common?A.Pair work.B.Al integration.C.Energy focus.D.LED application.22.What is special about the posters in Interactive Awareness Posters?A.They are fully recyclable.B.They provide campus lighting.C.They react to surroundings.D.They're printed with striking images.