問題詳情

   What makes people invent new things? —21— the old saying goes, “Necessity is the mother of invention.” When people have problems in their lives,theyinvent things to —22—their own needs. Later, the solutions —23 _ their problems mightbecomegreatinventions andchanged their way of life to a great level. We can see it in the following two examples. Teng Hung-chi, who is known 24— “Taiwan’s Edison,” has invented many useful things during his lifetime. One day，he was using the bathroom in the factory. His hands were dirty from work, —25—he did not want to touch the faucet. He thought, “If I could wash my hands without touching the faucet, it would be great.” Teng then worked hard to put this idea into —26—.. Because of his efforts, he earned national fame and a fortune.Have you ever used Post-it notes? —27— example is the Post-it note, Spencer Silver once tried hard to invent a strong glue. Although he —28— great efforts in reaching his goal，hefailed and the glue he made was very weak. He tried to —29— his coworkers of the usefulness of the weak glue，but no one believed it. Art Fry, Silver’s co-worker, then —30— the idea of using this weak glue on a piece of paper. Before long, the Post-it note was bom and it has become one of the most popular products in the world.
21.
(A) But
(B) As
(C) For
(D) Once

參考答案

答案：B
難度：簡單0.77027
統計：A(2),B(57),C(11),D(4),E(0)

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