【单选题】

Passage 1The food we eat seems to have profound effects on our health.Although science has made enormous steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well, especially cancer of the colon (结肠).Different cultures are more prone to contract certain illnesses because of the food that is characteristic of these cultures.That food is related to illness is not a new discovery. In 1945, government researchers realized that some food additives might cause cancer. Yet, for many reasons, these additives still remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to beef and poultry, and because of this, penicillin has been found in the milk of treated cows. Sometimes similar drugs are administered to animals not for medical purposes, but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market.Although the Food andDrugAdministration (FDA、has tried repeatedly to control these procedures, the practices continue. According to the passage, which of the following statements is not true

A、Drugs are always given to animals just for medical reasons.
B．Some of the additives in our food are added to the food itself and some are given to the living animals.
C．Researchers have known about the potential hazards of food additives for over 65 years.
D．Food may cause forty percent of cancer in the worlD、