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  3. Vitamins are organic compounds necessary in small amounts in the diet for the normal growth and maintenance of life of animals,i

Vitamins are organic compounds necessary in small amounts in the diet for the normal growth and maintenance of life of animals,i

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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 transforming foods into energy and body maintenance.There are thirteen or more of them,and if【C2】______is missing a deficiency disease becomes【C3】______.
    Vitamins are similar because they are made of the same elements—usually carbon, hydrogen, oxygen, and sometimes nitrogen.They are different【C4】______their elements are arranged differently,and each vitamin【C5】______one or more specific functions in the body.
    【C6】______enough vitamins is essential to life,【C7】______the body has no nutritional use for【C8】______vitamins.Many people,【C9】______,believe in being on the "safe side" and thus take extra vitamins.However,a【C10】______diet will usually meet all the body’s vitamin needs.
【C5】
选项 A、undertakes
B、holds
C、plays
D、performs
答案D
解析 performs意为“执行，履行，完成”，可与functions搭配，其余三个词不与之搭配。
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