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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.
【C6】
选项 A、in that
B、so that
C、such that
D、except that
答案A
解析 上句提到维生素相似的原因，这句开始提到维生素也是有区别的，由于两个句子是平行的结构，本句的后半句也会解释为什么不同。因此空格处应填入表因果关系并连接原因状语从句的短语。except that不表因果，so that和such that后面接结果。只有in that后面接原因，并且空格前面的different与介词in连用，表示“在哪一方面不同”。故选A。
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