閱讀理解 6

　　A branch of computer science called artificial intelligence(人工智能) uses programs that help solve problems by using human knowledge and experience. Artificial intelligence systems are also called expert systems, which enable computers programmed with great amounts of information to "think" about many possibilities such as diseases that certain symptoms(癥狀) could indicate and make a decision for the treatment.

　　Computers are used in teaching as well. Programs that perform computer-aided instruction(CAI 計算機輔助教學) are designed to help students at all levels, from elementary school to the university level. The student sits at the computer terminal(終端). The terminal's screen displays a question for the student to answer. If the answer is wrong or incomplete, the computer may ask the student to try again. It then may supply the correct answer and an explanation. CAI is also used in some adult education programs and as part of the employee-training programs of some business companies.

　　One of the most important uses of computers is to communicate information over long distances. They can send information to each other over telephone lines. As a result, computers keep banks, newspapers, and  other institutions supplied with up-to-the-minute information. A computer network consists of many computers in separate rooms, buildings, cities, or countries, all connected together. Computer networks allow people to communicate by using electronic mail(電子郵件)---- a document typed into one computer and "sent" to another. Such documents general travel in only a few minutes, even if they are being sent over a long distance.

　　The computer's ability to share information with other computers over a network linked by　

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