Printing soon became an important __55___in a rapidly growing world. By 1500,nearly 35,000 books were in print worldwide. But the printing press did not ___56___a lot for a long time. In the 19th century , however, iron ____57___wood in the press`s framework. And paper became___58___in continuous rolls rather than more expensive single pieces. Steam engines ___59__the speed at which the press ran. In the late 1900s,the introduction of better presses greatly __60___the time it took to turn ideas into books.

　　41.A.used

　　B. put

　　C. read

　　D. written

　　42.A.shown

　　B .turned

　　C. moved

　　D. added

　　43.A.needed

　　B. lost

　　C. collected

　　D. found

　　44.A.challenged

　　B. studies

　　C. discoveries

　　D. developments

　　45.A.Recently

　　B. Immediately

　　C. Previously

　　D. Finally

　　46.A.discussion

　　B. production

　　C. instruction

　　D. preparation

　　47.A.pages

　　B. ideas

　　C. models

　　D. characters

　　48.A.attraction

　　B . expressin

　　C. competition

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