What are nitrates used for? A. They preserve flavor in packaged foods B. They cause the animals to become fatter. C. They are the objects of research D. They preserve the colouĐoạn văn18/74What are nitrates used for?They preserve flavor in packaged foodsThey cause the animals to become fatter.They are the objects of researchThey preserve the colour of meatGiải thíchĐáp án: D