SECTION B PASSAGES Directions: In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow. 听力原文： During most of human history, communication was limited by time and distance. In less than 200 years, however, revolutionary changes in communication have occurred. In the 19th century, the telegraph and telephone were invented. Radio, television and computers were developed in the 20th century. These inventions completely changed people's lives around the world. Today all of these communication devices are being linked together, creating a worldwide 'information' revolution. This new wave of technology is called 'telecommunications' the use of electronic media (television, radio, telephones and computers) to communicate across distance and time. Telephones are now connected to home computers and television sets; radio stations are linked to home computers and home computers are tied to news publishing services. Much of this is possible because of new technology that is known as fiber optics communication lines that are made of glass fibers. Because of glass-fiber technology, large amounts of information may be sent at great speed over telephone and cable television lines. Today the world can be linked instantly by computers and satellites. All of our systems economic, social and political are already being affected by these tools of technology. In the not-too-distant future, everyone will be affected by these and further developments in telecommunications. Which of the following can best serve as the title of the passage?