軍人&預官◆英文題庫下載題庫

The story of communication is an important part of world history. In prehistoric times, for example, people did not have books. They did not know much about geography. 19 . They knew only about themselves and their environment (the land around their homes). Their knowledge of geographical things like mountains and rivers was limited. They did not travel very far. Sometimes they knew about nearby people and communicated with them. 20 . Early types of signals for communication included smoke from fires and the sounds of drums. Then people formed towns, and then cities, as safe places to live. Soon they began to develop other ways to communicate, to spread information. People began to buy and sell things to one another. Because of their business, they developed writing systems to keep records and to send messages. Life was changing for many people. 21 , and so did the invention of the printing press. Many more people learned to read then. 22 . People sent letters and news by horse and carriage. Later the mail went by train, by boat, and then by airplane. World communication became a possibility.