According to the passage, 80% of all human illnesses are connected with ______. Nitrates are used to ______.

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问题 According to the passage, 80% of all human illnesses are connected with ______.
Nitrates are used to ______.

选项 A、make animals fatter
B、preserve flavor in packaged foods
C、preserve the color of meats
D、make food more tasty

答案C

解析 细节题。答案在文章第二段的中间一句。nitrites,commonly used to preserve color in meats。
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