18.Post-It Notes were invented by accident. The man behind Post-It notes was Spencer Silver. According to the former Vice President of Technical Operations for 3M Geoff Nicholson (now retired), in 1968, Silver was working at 3M trying to create especially strong adhesives (粘合剂) for use in the aerospace industry in building planes. Instead of a super strong adhesive, though, he accidentally managed to create a weak, pressure sensitive adhesive :thing. This adhesive did not interest 3M management as it was seen as too weak to be useful. It did have two interesting features, though. The first is that, when stuck to: a surface; it can be taken away without leaving any residue (残留物). The second big feature is that the adhesive is re-usable. Despite these two great features, no one, not even Silver himself, could think up a good marketable use for it.
Finally, in 1973, when Geoff Nicholson became products Jaboratory manager at 3M, Silver came to him with the adhesive and :gave him samples to play with Silver also suggested what he saw as his best idea for what to use the adhesive for, making a board with the adhesive sprayed on it. One could then stick pieces of paper to the board without tacks, tape, or the like. The paper could be easily peeled away without any residue.
After years in development, they were finally a hit and have since become important in offices the world over, today being one of the top five best selling office products in the world.
Another interesting thing about Post-It notes is about the color. Ever wonder why the standard color for Post-It notes is yellow? It turns out this was kind of an accident as well. The official story from some at 3M is that it was because it created a "good emotional (情感) connection with users" and that it would "contrast (对比) well stuck to white paper". However, according to Geoff Nicholson there was no such thought. The real reason Post-It notes were yellow was simply because the lab next door to where they were working on the Post-It notes had some yellow paper — that's why they were yellow; and when we went back and said 'hey guys, you got any more yellow paper?'they said you want any more go buy it yourself, and that's what we did, and that's why they were yellow. It was another one of those unexpected accidents. It was not thought out; nobody said they'd better be yellow rather than white because they would blend in — it was a complete accident."
(1)Who were Post-It notes invented by?
(2)选出找出划线单词"hit"意思, 并将字母代号填入到横线处.
A. 热销
B. 击打
C. 伤害
(3)根据短文内容回答问题. Why are the Post-It notes yellow?
(4)找到与"People can simply take away the paper, leaving no marks on the board. "意思相同或相近的句子
(5)The passage is mainly about