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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.
【C2】
选项 A、shifting
B、transferring
C、altering
D、transforming
答案D
解析 由文意可知，空格填入的分词需和into搭配，并符合文意。transform常与into搭配，强调的是“事物大的变革或质的改变”。在此从food(食物)到energy(能量)的转变是一种质的改变，因此，D符合句意。shift不与into搭配，transfer多用于位置的改变，也不与into搭配；alter强调部分或少量的变动，程度较轻，因此以上三个词都不能表示事物质的改变。故选D。
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