2. 外语
  3. The food we eat seems to have profound effects on our health. 【C1】______ science has made enormous steps 【C2】______ making foo

The food we eat seems to have profound effects on our health. 【C1】______ science has made enormous steps 【C2】______ making foo

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问题     The food we eat seems to have profound effects on our health. 【C1】______  science has made enormous steps  【C2】______ 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【C3】______ are related to diet and forty percent of cancer is related to the diet as well,【C4】______ cancer of the colon (结肠癌). Different cultures are more prone to 【C5】______ certain illnesses because of the food that is  【C6】______ in these cultures. That food is related to illness is 【C7】______  a new discovery. In 1945, government researchers realized that nitrates and nitrites (硝酸盐和亚硝酸盐) , commonly used to preserve color in meats, and other food additives(添加剂 ) , 【C8】 ______ cancer. Yet, these carcinogenic (致癌的)additives  【C9】______ in our food, and it becomes more 【C10】______  all the time to know which things on the packaging labels of processed food are helpful or【C11】______ . The additives which we eat are not all so 【C12】______ Farmers often give penicillin (青霉素)to beef and poultry, and 【C13】______ of this, penicillin has been found in the milk of 【C14】 ______ cows. Sometimes similar drugs are 【C15】 ______ to animals not for medicinal purposes, but for 【C16】______reasons. The farmers are simply trying to 【C17】______ the animals in order to obtain a 【C18】______ price on the market. Although the Food and Drug Administration (FDA) has tried 【C19】______ to control these procedures, the practices 【C20】______ .
【C1】
选项 A、Once
B、Because
C、When
D、Although
答案D
解析 两分句间为让步关系，只能选D。
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大学英语六级

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