What are nitrates used for? A. They preserve flavor in packaged foods. B. They preserve the color of meats. C. They are the objects of research. D. They caused to animals to become fatter.Đoạn văn34/62What are nitrates used for?They preserve flavor in packaged foodsThey preserve the color of meats.They are the objects of research.They caused to animals to become fatter.Giải thíchChọn B