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     When the steam engine(蒸汽机)was i 1     in the 18th century,it began one of the g 2      revolutions(革命)that had ever happened in our world. The i 3      of the petrol engine(内燃机)at the end of the 19th century led other great c 4      in our lives. And the computer is an invention more important than these engines w 5     

    Just as there was a Stone Age(石器时代).an Iron Age(铁器时代)and so on,we have been 1  6      for centuries in a Paper Age. And almost all information was k 7      and s 8      on paper, and so much of it is wasted after it has been used o 9      that a large number of trees have to be cut down every year to make paper. But now,with the computer,a lot of information can be stored and sent w 10      any paper at all,using small discs(碟片)or magnetic tapes.

    1.          2.        3.      4.       5.       

    6.          7.      8.       9.      10.        

     1. invented  2. greatest 3. invention 4. changes 5. were 6. living  7. kept 8. sent  9. once 10. without

    题目来源：初中英语丢分题每周一练九年级全一册 > 能力训练21

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