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  3. Vitamins are organic compounds necessary in small amounts in the diet for th

Vitamins are organic compounds necessary in small amounts in the diet for th

游客2025-03-20  7
问题     Vitamins are organic compounds necessary in small amounts in the diet for the normal growth and maintenance of life of animals, including man.
    They do not provide energy,【C1】______ do they construct or build any part of the body. They are needed for【C2】______ foods into energy and body maintenance. There are thirteen or more of them, and if【C3】______ is missing a deficiency disease becomes【C4】______ .
    Vitamins are similar because they are made of the same elements—usually carbon, hydrogen, oxygen, and【C5】______ nitrogen. They are different【C6】______ their elements are arranged differently, and each vitamin【C7】______ one or more specific functions in the body.
    【C8】______enough vitamins is essential to life, although the body has no nutritional use for【C9】______ vitamins. Many people,【C10】______ , believe in being on the "safe side" and thus take extra vitamins. However, a well-balanced diet will usually meet all the body’s vitamin needs. [br] 【C1】
选项 A、either
B、so
C、nor
D、never
答案 C
解析
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