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托福考试词汇语法练习及答案 Post-it Noteswere inventedin the1970s atthe3M panyin Minnesotaquite byaident,Researchers at3M wereworking ondeveloping differenttypes ofadhesives,and oneparticularly weak adhesive,a poundof acrylatecopolymer microspheres,was developed.Employees at3M wereasked ifthey couldthink ofa usefor aweakadhesivewhich,provided itdid notget dirty,could bereused.One suggestionwas thatit couldbe appliedto apiece ofpaper touse asa bookmarkthat wouldstay inplace ina book.Another usewas foundwhen theproduct wasattached toa reportthat wasto besent toa colleaguewith arequest forments onthe report;the colleaguemade hisments onthe paperattached tothe reportand returnedthe report.The ideafor Post-it Noteswas born. It wasdecided withinthe panythat therewould bea testlaunch ofproduct in1977in fourAmerican cities.Sales ofthis innovativeproduct intest citieswere lessthan s___ar,most likelybecause thepro...。