51. A man in the appearance of phobic situation 　　　　.

A. is called an anxiety attack　　　 B. has blood rush to his legs

C. has the feeling of flight　　　　 D. fears some particular thing

52 The writer of the text tells us that 　　　　.

　　 A. when some phobia breaks out in someone, he will feel too anxious about something

　　 B. a person who fears people can run a race with others

　　 C. a man afraid of heights can climb to a great building easily

　　 D. everyone dares to take a lift where there is not a lifeguard

N

　　 American doctors say that mothers who smoke cigarettes before their babies are born may slow the growth of their babies’ lungs. They say reduced lung growth could cause the babies to suffer breathing problems and lung disease later in life. Doctors in Boston, Massachusetts studied 1,100 children. The mothers of some of the children smoked, the other mothers did not. Doctors found that the lungs of the children whose mothers did not smoke, and that the children whose mother smoked developed 20% more cold and breathing diseases than other children later in life.

　　 Another recent study found that children had a greater chance of developing lung cancer if their mothers smoked.

　　 The study also showed that the danger of lung cancer increased only for sons and not for daughters, and that the father’s smoking did not affect a child’s chance of developing lung cancer.

50. A good way to overcome one’s unreasonable fear of something would be 　　　.

　　 A. trying to avoid it　　　　　　　 B. preparing for flight of fight

C. getting rid of the anxiety　　　 D. trying to get used to it

49. A person who is afraid of cats is most likely to have 　　　　.

　　 A. mysophobia　　 B. acrophobia　　 C. zoophobia　　　 D. claustrophobia

48. What would be the best title for this text 　　　　?

　　 A. Computers are Danger　　　　　　 B. Computers are Cleverer

　　 C. Computers are Useful　　　　　　 D. Computers are Interesting

M

　　 Do you have a phobia? No, it is not an infectious disease, but it can make you quite as bad. A phobia is an unreasonable fear of some particular thing or situation.

　　 Did you know that some people fear heights? That is called acrophobia. Many people experience claustrophobia when they are in a closed space such as a small room or a lift. Zoophobia is a fear of animals. A fear of dirt is called mysophobia. There are names for fear of thunder, lightning, wide open spaces, people, crowds, darkness, water, and many other things.

　 　A phobia expert tells us that in the coming of a phobia situation a person has what is called an “anxiety attack”. Blood rushes to his larger muscles in preparation for flight or fight.

　　 One expert on phobias suggests we race our fears gradually. A person who is afraid of people could overcome this fear by getting accustomed to them one at a time. Someone who is afraid of water could take swimming lessons in the relative safety of a pool with lifeguard at hand. A person afraid of heights could practice looking down from middle heights first until he could handle the greater ones.

47. The phrase “up-to-the-minute” in the third paragraph means “　　　 　.”

　　 A. shortest　　　 B. latest　 　　　　C. longest　　　　 D. easiest

46. 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

45. From the first paragraph we can get to know that 　　　　.

　　 A. artificial intelligence system 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 systems are under scientists’ control

44. We normally buy food on the basis 　　　　.

　　 A. organic variety　　　　　　　　　 B. beauty　　

　　 C. refined contents　　　　　　　　 D. color and texture

L

　　 A branch of computer science called artificial intelligence (人工智能) uses programs 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 a 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 institutes supplied with up-to-the-minute information. A computer networks allow people to communicate by using electronic mail-a document typed into one computer and “sent” to another. Such documents generally travel in only a few minutes, even if they are being sent over a long distance.

　　 The computer’s ability to share information with computers over a network linked by telephone lines is a major revolution on telecommunications (电信). The Internet, an international network of computer networks, has spread out since the early 1990’s. The Internet began as a US network of scientific and military computers in the 1990’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 people can work at home instead of in their office.

　　 Computers and their programs are the most complex devices in human history, and probably the most useful. Modern industrial societies now depend on them. As computer education more powerful and widespread, computer education must continue to increase also.

43. What happens to food when it is processed?

　　 A. The basic content remains the same.

　　 B. Vitamin is not available after processing.

　　 C. The vitamin content increases a bit.

　　 D. The vitamin content is greatly reduced.

42. What do all of the additives in bread have in common?

　　 A. They are all used to keep the bread from getting moldy.

　　 B. They are all poisonous.

　　 C. They are all organic.

　　 D. They all have all killed laboratory animals.