TOEFL Reading: ETS-TOEFL阅读机经 - TY1537KM6HQ1GFO8L$

According to paragraph 4, which of the following occurred because of the invention of movable type? A. An increase in the cost of book production B. An increase in the popularity of the techniques of woodblock and woodcut C. The creation of a large number of printing jobs D. A decline in the importance of human copyists