38. 글의 흐름으로 보아, 주어진 문장이 들어가기에 가장 적절한 곳을 고르시오.
The advent of literacy and the creation of handwritten scrolls and, eventually, handwritten books strengthened the ability of large and complex ideas to spread with high fidelity.
The printing press boosted the power of ideas to copy themselves. Prior to low-cost printing, ideas could and did spread by word of mouth. While this was tremendously powerful, it limited the complexity of the ideas that could be propagated to those that a single person could remember. ( ① ) It also added a certain amount of guaranteed error. ( ② ) The spread of ideas by word of mouth was equivalent to a game of telephone on a global scale. ( ③ ) But the incredible amount of time required to copy a scroll or book by hand limited the speed with which information could spread this way. ( ④ ) A well-trained monk could transcribe around four pages of text per day. ( ⑤ ) A printing press could copy information thousands of times faster, allowing knowledge to spread far more quickly, with full fidelity, than ever before.
* fidelity: 충실 ** propagate: 전파하다