听力题 People have heard of various kinds of spies, from the Trojan horse to Guillaume. Today a new kind of spy is appearing — Fly spy, which was beyond our imagination in the past. In the body of each fly spy is hidden a tiny radio station. These spies are sent flying about in the embassy or the headquarters of the enemy collecting information. They are so small that they hardly arouse any suspicion, especially among common flies, while a lot of top secrets through them, are going out without people''s knowing. People are now doing their best to stop these fly spies from coming in or to catch them in special ways. Once a fly spy was caught and placed under a microscope for observation. To their great surprise, people discovered a complete radio station — a tiny silicon chip that was much smaller than a grain of rice. The silicon chip was crisscrossed with countless microcircuits. Such silicon chips, less than two square millimeters each, look quite ordinary, but they have surprising “magic power”— they are capable of receiving, processing and sending out messages. These magic silicon chips will, some people believe, certainly bring about marvelous changes to the life and production of mankind.