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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,

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

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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,【21】 do they construct or build any part of the body. They are needed for【22】 foods into energy and body maintenance. There are thirteen or more of them, and if【23】 is missing a deficiency disease becomes【24】
    Vitamins are similar because they are【25】 of the same elements--usually carbon, hydrogen, oxygen, and【26】. nitrogen. They are different【27】 their elements are  arranged【28】, and each vitamin【29】 one or more specific【30】 in the body.
    【31】 enough vitamins is essential to life,【32】 the body has no nutritional use for【33】 vitamins. Many people,【34】, believe in being on the "safe side" and thus take extra vitamins. However, a【35】 diet will usually meet all the body’s vitamin needs.
选项 A、nevertheless
B、therefore
C、moreover
D、meanwhile
答案A
解析 A项nevertheless意为“然而，可是”，表示转折语气；B项therefore意为“因此”，表示因果关系；C项moreover意为“此外”，表示递进关系；D项meanwhile意为“同时”。
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