Gutenberg's printing press was not so much an ___48____, however, as an improvement of developing technologies. The Chinese were the first to use wooden blocks(木刻版),as early as the 8th century. Then great __49___was made around 1040. The movable type was invented by Bi Sheng in China. European ___50____the printing methods centuries later. Another contribution to Cutenberg`s system also come from the East,__51____.The Chinese invented paper using ___52___materials,including old clothes. The kind of the inexpensive paper was introduced into Europe in 1000 or so. This kind of paper was __53___for the new European printing presses,__54____it took in the only ink required for the metal type.
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
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