题目内容
4.听下面一段材料,回答第18至20题.18.What is the major source of Vitamin D?
A.Blood. B.Some foods. C.Sunlight.
19.What are the"rickets and multiple sclerosis or MS"?
A.Names of diseases. B.Names of Vitamins. C.Names of bones.
20.Why do people add vitamin D to milk?
A.To prevent blood disease. B.To prevent bone disease. C.To prevent mental disease.
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