We normally buy food on the basis . A. organic variety B. beauty C. refined content——青夏教育精英家教网—

摘要： 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 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 could indicate and make a decision for the treatment. Computers are used in teaching as well. Programs that perform computer-aided instruction are designed to help students at all levels, from elementary school to the university level. The student sits at a computer terminal . 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 . 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.

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Health food is a general term applied to all kinds of food that is considered more healthy than the types of food sold in supermarkets.For example，whole grains，dried beans，and corn oil are health foods.A narrower classification of health food is natural food.This term is used to distinguish between types of the same food.Raw honey is a natural sweetener，while refined(提炼的)sugar is not.The most exact term of all and the narrowest classification within health food is organic food，used to describe food that has been grown on a particular kind of farm.Fruits and vegetables 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.

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 health food supporters as an example of a processed food. First, the seeds from which the grain is grown are treated with a chemical which 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 which is also poisonous. Next, a dough conditioner is added along with a softener. The conditioner and softener are poisons，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. 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.

1．What is the passage mainly about?

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

C．Processed food. 　　　　　　D．Poisons.

2．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 have all killed laboratory animals.

3．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.

4．We normally buy food on the basis of________.

A. organic variety 　　　　　　　B. beauty

C. refined contents 　　　　　　　D. smell, color and texture

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　　Health food is a general term applied to all kinds of foods that are considered more healthful than the types of foods sold in supermarkets. For example, whole grains, dried beans, and corn oil are health foods. A narrower classification of health food is natural food. This term is used to distinguish between types of the some food. Raw honey is a natural sweetener, whereas refined sugar is not. Fresh fruit is a natural food, but canned fruit, with sugars and other additives, is not. The most precise term of all and the narrowest classification within health foods is organic food, used to describe food that has been grown on a particular kind of farm. Fruits and vegetables that are grown in gardens that are treated only with organic fertilizers, that are not sprayed with poisonous insecticides, and that are not refined after harvest, are organic foods, meats, fish, dairy and poultry products from animals that are fed only organically－grown feed and that are not injected with hormones are organic foods.

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

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

　　A very toxic anti-fungal compound, is added to keep the bread from getting moldy.

　　Other foods from the supermarket would show a similar pattern of processing and preserving. 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, preferable the organic variety.

1．What is the main idea of this passage?

[　　]

A．Health food.

B．The processing of bread.

C．Organic gardens.

D．Poisons.

2．Which term is used to distinguish between types of the same food?

[　　]