centuries

　　later. Another

　　contribution to Gutenberg's system also comes from the East, _____11__. The Chinese invented paper using___12__ materials,

　　including old clothes. The kind of the inexpensive paper was

　　introduced into Europe in 1000 or so. This kind of paper was___13__ for the new European printing presses,___14___it took in

　　the only ink required for the metal type.

　　Printing soon became an important___15___in a rapidly

　　growing world. By 1500, nearly 35,000 books were in print

　　worldwide. But the printing press did not___16__ a lot for a long

　　time. In the 19th century, however, iron___17__ wood in the

　　press' framework. And paper became___18__ in continuous rolls

　　rather than more expensive single pieces. Steam engines___19___the speed at which the press ran. In the

　　late 1900s, the

　　introduction of better presses greatly___20___the time it took to turn ideas into books.

　　本文讲述印刷术的发展。作者一开始介绍德国印刷工研制了一种新型的印刷机，但这只是标志着印刷技术的发展，后来中国的毕昇发明了木制活字印刷术等。

　　1．A.used

　　B．put

　　C．read

　　D．written

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