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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.
【C4】
选项 A、serious
B、apparent
C、severe
D、fatal
答案B
解析 根据上下文，这里需要填入一个准确描述疾病症状的词。serious、severe和fatal这几个词都表示程度严重，甚至危及生命。但上下文没有暗示缺乏一种维生素会导致严重的后果，因此，这三个词都不可作为被选项。apparent只是简单地描述了疾病的症状，为正确选项。故选B。
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