2. 职称英语
  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2025-04-03  24
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] 【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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