Read the following passage and choose the most likely answer to each of the following questions.
The 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. Different cultures are prone to contract certain illnesses because of the food that is characteristic in these cultures. That food is related to illness is not a new discovery. In 1945, government researchers realized that nitrates (硝酸钾) and nitrites (亚硝酸盐), commonly used to preserve color in meats, and other food additives, caused cancer. Yet, these carcinogenic additives 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 (given) to animals not for medicinal 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 and Drug Administration has tried repeatedly to control these procedures, the practices continue.
How has science done a disservice (伤害) to mankind? （ ）.
A、
Because of science, disease caused by contaminated food has been virtually done away with
B、
It has caused a lack of information, concerning the value of food
C、
As a result of scientific intervention, some potentially harmful substances have been added to our food
D、
The scientists have preserved the color of meats, but not of vegetables
【正确答案】：C
【题目解析】：
本题考查文章中科学技术是如何对人类造成伤害的。
定位到第二句“尽管科学在使食物更适合食用方面已经取得了巨大的进展，但同时也使许多食物不适合食用。”并举了几个例子，如硝酸盐、亚硝酸盐、青霉素等，它们被添加到食品中，进而对人体造成危害，从而可以推断，C选项“作为科学介入的结果，很多潜在的有害物质被添加到了我们的食物之中”符合题意。