C People could not find silk, cotton or bamboo D, People could only produce books one at a time by hand (4)What happened after books became cheaper? A, People didn ' t want to buy books B, Printing was invented in China C Knowledge and ideas spread quickly D The Internet was introduced to people soon (5 What is the writer's opinion about books and computers? A, People won ' t need books any more B, Books won' t be replaced by computers C People prefer to find information in book D, Computers have already replaced books -4-/9- 4 - / 9 C、People could not find silk, cotton or bamboo. D、People could only produce books one at a time by hand (4)What happened after books became cheaper? A、People didn't want to buy books. B、Printing was invented in China. C、Knowledge and ideas spread quickly. D、The Internet was introduced to people soon (5)What is the writer's opinion about books and computers? A、People won't need books any more B、Books won't be replaced by computers. C、People prefer to find information in books. D、Computers have already replaced books