Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries．Yet much had happened【C1】______．AS was discussed before. it was not【C2】______the 19th century that the newspaper became the dominant pre-electronic【C3】______，following in the wake of the pamphlet and the book and in the【C4】______of the periodical．It was during the same time that the communication revolution【C5】______up，beginning with transport，the railway，and leading【C6】______through the telegraph，the telephone，radio，and motion pictures【C7】______the 20th century world of the motor car and the airplane．Not everyone sees that process in【C8】______．It is important to do so．
It is generally recognized．【C9】______that the introduction of the computer in the early 20th century，【C10】______by the invention of the integrated circuit during the 1960s，radically changed the process，【C11】______its impact on the media was not immediately【C12】______. As time went by，computers became smaller and more powerful，and they became“personal”too，as well as【C13】______，with display becoming sharper and storage【C14】______increasing．They were thought of，like people，【C15】______generations，with the distance between generations-much【C16】______．
It was within the computer age that the term“information society”began to be widely used to describe the【C17】______within which we now live．The communications revolution has【C18】______both work and leisure and how we think and feel both about place and time，but there have been【C19】______views about its economic，political，social and cultural implications．“Benefits”have been weed【C20】______“harmful” outcomes．and generalizations have proved difficult．
【C1】

A. between
B. before
C. since
D. later