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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, 【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.
【C9】
选项 A、exceptional
B、exceeding
C、excess
D、external
答案C
解析 本题空格所在部分是although引导的让步状语从句。have use for是固定短语，意为“需要”，主要用于否定和疑问句中，因此，根据所在从句的含义，判断出人体对什么维生素没有营养上的需要。首先排除external和exceptional，因为不存在“外部的维生素”或“例外的维生素”；exceeding用来指被修饰的成分超出了一般的限度，它不能直接修饰“维生素”：只有excess指“超过正常或所需数额的数量”，强调“摄入过多的维生素”符合逻辑。故选C。
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