阅读理解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(症状 ) could indicate and make a decision for the treatment. Computers are used in teaching as well. Programs that perform computer-aided instruction(CAI 计算机辅助教学) are designed to help students at all levels, from elementary school to the university level. The student sits at the computer terminal( 终端 ). 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( 电子邮件 )- 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 telephone lines is a major revolution in telecommunications(电讯 ). The Internet, an international network of computer networks, has spread out since the early 1990 s. The Internet began as a US network of science and military （军事） computers in the 1960 s. Now it is an international system for sending and receiving electronic mail, software, and electronic document and picture files all over the world. The Internet has already cut the cost of long-distance communications for many people. In the future, it will completely change the way people work. With the Internet, increasing numbers of the people can work at home instead of in their office. Computers and their programs are the most complex （复杂）devices （装置） in human history, and probably the most useful. Modern industrial societies now depend on them. As computers become more powerful and widespread, computer education must continue to increase also. 1.From the first paragraph we can get to know that _. A. artificial intelligence system s are beyond scientists control B. artificial intelligence systems will take the place of doctors C. artificial intelligence systems will take the place of scientists D. artificial intelligence syst ems will under scientists control 2.If you use e-mail to communicate with your friends, you can _. A, talk with your friends freely B. exchange information without paper C. talk with your friends face to face D. exchange information without computers 3.The phrase “ up-to-the-minute ” in the third paragraph means _. A, shortest B, latest C. longest D. easiest 4.The Internet, according to the passage, _. A. was first used in teaching B. was first built by soldiers C. can make us lazy D. can make our lives easier 5.What would be the best title for the text? A. Computers Are Dangerous B. Computers Are Cleverer C. Computers Are Useful D. Computers Are Interesting