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.

41. What is the passage mainly about?

　　 A. Healthy food.　　　　　　　　　　 B. The processing of bread.

　　 C. Processed food.　　　　　　　　　 D. Poisonous.

40．From this passage, we all know ________.

　A. France produces the most apples in the world

　B. there are more apples in America than in France

　C. the apples in France are better than those in America

　D. apple trees are easy to grow in New York

K

　　 Healthy food is a general term (术语) applied to all kinds of food that is considered healthier than the types of food sold in supermarkets. For example, whole grains, dried beans, and corn oil are health food. A narrower classification (分类) of healthy food is natural food. This term is used to distinguish (区分) between types of the same food. Raw honey is a natural sweetener, while refined (提炼的) sugar is not. Fresh fruit is a natural food, but canned fruit, with sugars and other additives (添加剂), is not. The most exact term of all and the narrowest classification within health food that has been grown on a particular kind of farm. Fruits and vegetable that are grown in gardens, that are treated only with organic fertilizers, that are not sprayed with poisonous insecticides (杀虫剂), and that are not refined after harvest, are organic food. Meat, fish, dairy and poultry products from animals that are fed only on organically-grown food and that are not injected with hormones (激素) are organic food.

　　 In choosing the type of food you eat, then, you have basically two choices: inorganic, processed (加工) food, or organic, unprocessed food. A wise decision should include study of the reason why processed food contains chemicals, some of which are proved to be poisonous and that vitamin content is greatly reduced in processed food.

　　 Bread is typically used by healthy food supporters as an example of a processed food. First, the seeds from which the grain is grown are treated with a chemical that is extremely harmful. Later, the grain is sprayed with a number of very deadly insecticides. After the grain has been made into flour, it is made white with another chemical that is also poisonous. Next, a dough conditioner is added along with a softener. The conditioner and softener are poisonous, and in fact, the softener has sickened and killed experimental animals.

　　 A very poisonous antifungal compound, is added to keep the bread from getting moldy (发霉的).

　　 Other food from the supermarket would show a similar pattern of processing and preserving (保存). You see, we buy our food on the basis of smell, color and texture, instead of vitamin content, and manufacturers give us what we want, even if it is poisonous. The alternative? Eat health foods, preferably the organic variety.

39．What can we know from the underlined sentence?

　A. American apples taste good.

　B. We can see apples everywhere in America.

　C. Americans like to eat apples.

　D. Americans regard apples as their best food.

38. The writer took her neighbor to France for Christmas because he __.

A. felt lonely in England　　　 B. had never been to France

C. was from a typical French family

D. didn't like the British idea of family

J

　Almost everyone likes to eat apples. Apples grow in nearly every part of the world. The United States produces more apples than any other country except France. The states of Washington and New York grow the most apples. New York is on the east coast and Washington is on the west near Canada,

　Apples are red, yellow or green. They are very popular in the United States. Many people like to carry apples to work or to school to eat with their lunches. Most American people are often too busy or too tired to cook dinner, so they often have their dinners very simply. Apple juice is also a popular drink and apple pie is the favorite dessert for many Americans.

　The state of Washington is proud of its apples. The trees there produce nearly five billion apples every year-one apple for every man, woman and child in the whole world.