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    Some inventions are so useful, but seem so simple, that we wonder why no one thought of them long ago. Post-it Notes, the pieces of paper that you can fasten almost anywhere and then remove without leaving any sign that they were there, are an example of such an invention.
    　　Post-it Notes were invented about twenty years ago by Art Fry, a scientist at 3M Corporation. The idea for the product came from a frustrating experience he often had while singing in his church choir. Fry used pieces of paper as bookmarks to mark the places in his book of songs, but these bookmarks were always falling out. He knew he needed a bookmark that would stay where he put it, but that he could remove without damaging the pages.
    　　Around that time, Fry heard about a new adhesive (粘合剂) that a workmate, Dr. Spence Silver, had created. This adhesive was special because it was sticky, but not too sticky. It was strong enough to hold papers together, but weak enough to not tear the paper when it was removed. Fry saw that the new adhesive could help solve his bookmark problem. One morning, Fry put some of the adhesive on the edge of a piece of paper. Just as he hoped, it made a perfect bookmark.
    A short time later, Fry realized that his new invention had even more uses than being a great bookmark. He came to this realization when he wrote a note on one of his new "bookmarks" and attached it to a report he was going to give to a workmate. Soon, co-workers were asking Fry for more samples of his invention so that they could use the new type of notes themselves.
    　　Fry and some other people at 3M believed so much in the new product that they persuaded the company to give away thousands of the "sticky pieces of paper" for trial use(试用). When some salespeople at 3M went to offices and showed workers just how helpful the new type of notes could be, they immediately received many orders. As more and more people discovered how useful Post-it Notes could be, the product took off.
    小题1:The invention of Post-it Notes showed that Art Fry________ .
    A．had a lot of knowledge
    B．was very hard-working
    C．was good at creative thinking
    D．loved his job in the church
    小题2: In what way did Dr. Spence help Art Fry?
    A．They worked together and often discussed science.
    B．His invention of a special adhesive made Art's invention possible.
    C．He advised 3M Corporation to give away lots of Post-it Notes for trial use.
    D．He worked together with Art by providing the new adhesive for Art.
    小题3: The underlined phrase "took off" means_______ .
    A．started to leave the groundB．disappeared from the market
    C．had even more usesD．became popular very quickly
    小题4:The biggest advantage of Post-it Notes is_______.
    A．it can stay anywhere and leave no sign when removed　　
    B．it is very cheap to use　　
    C．it is good to write notes on
    D．it is very thin and beautiful

    小题1:C
    小题2:B
    小题3:D
    小题4:A

    试题分析：一些发明太有用，但似乎太简单，我们很奇怪为什么很久以前没人想到。便利贴大约20年前由阿特.弗莱发明的，3M公司的一个科学家。那时候，弗莱听说一种他的同事斯朋斯.西尔佛发明的一种新粘合剂，够强把纸粘在一起，但当把它使掉时又够弱不会把纸撕坏。 一天早上，弗莱把一些粘合剂放在一张纸的边上，正如他希望的，做成了一个完美的书签。随着越来越多的人发现便利贴多么有用，便利贴越来越受欢迎。
    小题1:细节理解题。根据Post-it Notes were invented about twenty years ago by Art Fry, a scientist at 3M Corporation.便利贴大约20年前由阿特.弗莱发明的，3M公司的一个科学家，可知答案选C
    小题2:细节理解题。根据Around that time, Fry heard about a new adhesive (粘合剂) that a workmate, Dr. Spence Silver, had created. 那时候，弗莱听说一种他的同事斯朋斯.西尔佛发明的一种新粘合剂，One morning, Fry put some of the adhesive on the edge of a piece of paper. Just as he hoped, it made a perfect bookmark.一天早上，弗莱把一些粘合剂放在一张纸的边上，正如他希望的，做成了一个完美的书签，可知答案选B
    小题3:细节理解题。根据As more and more people discovered how useful Post-it Notes could be,随着越来越多的人发现便利贴多么有用，可知是越来越受欢迎，故答案选D
    小题4:细节理解题。根据 It was strong enough to hold papers together, but weak enough to not tear the paper when it was removed. 够强把纸粘在一起，但当把它使掉时又够弱不会把纸撕坏，可知答案选A
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