Yet, these additives remain in our food, and it is difficult to know which things on the wrappings（包装）of foods are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to their animals, and because of this, penicillin has been found in the milk of cows. Sometimes similar things are supplied to animals not for their health, but just to make a profit.

　　The farmers are simply trying to fatten the animals in order to get a higher price on the market. Although some countries have tried to control such things, the practice continues.

　　50. According to this passage, we can know      . 

　　  A. perhaps most of human illness is caused by what we eat

　　  B. perhaps most kinds of cancer are related to what people eat

　　  C. cancer was discovered in 1945

　　  D. science has made food unfit to eat

　　51. Things that are used to keep colours in meats are       .

　　  A. harmful      B. useless        C. helpless         D. dangerous

　　52. All the additives       .

　　  A. are bright and colourless          

　　  B. are not bright and colourful

　　C. have indirect effects on our health 

　　  D. have direct effects on our health

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