沒有 【段考】高一英文 權限，請先開通．

 [A] Well goes an old saying, “Necessity is the mother of invention.” More often than not, inventions are made not because inventors set out to accomplish something big in the first place. 11 , they often stumble upon great ideas or discoveries 12 usefulness even they themselves are not aware of. 

       The Post-it note, for example, was 13the result of a failed experiment. Spencer Silver 14 was one of the inventors of the Post-it note, had tried to invent a strong glue. 15 the fact that he experimented with different chemicals, he was never satisfied with the results. The glue that he made ended up 16 very weak. He wasn’t disappointed, 17 . Rather, he tried to convince his co-workers of the potential of the weak glue, but they still took him lightly.

        Eventually, Silver’s weak glue drew someone’s attention. When Silver’s co-worker, Art Fry, sang hymns during church services, his bookmarks fell out of his hymn book again and again 18really frustrated him. One day, it 19 him that using Silver’s weak glue on a piece of paper might help him mark the right page without damaging the book. It wasn’t until then did the two inventors find out 20 to deal with the weak glue, and the Post-it note quickly sold like hot cakes around the world.