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