How has science done a disservice to mankind? The FDA has tried repeatedly to control ______.

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问题 How has science done a disservice to mankind?
The FDA has tried repeatedly to control ______.

选项 A、the attempt to fatten the animals
B、the attempt to cure sick animals
C、the using of drugs to animals
D、the using of additives to preserve the color of food

答案C

解析
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