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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
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2025-04-03
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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. [br] 【C3】
选项
A、any
B、some
C、anything
D、something
答案
A
解析
空格所在句子是一个由and连接的并列句,前一个分句There are thirteen or moreof them中的them指的是vitamins,后一个分句是一个由if引导的条件状语从句,意为“如果……缺乏,(会出现)维生素缺乏症。”由于if引导的从句中谓语动词is是单数,因而,只能由一个表示单数意义的不定代词作为被选项。首先排除some,它一般用于肯定句,做主语时谓语动词用复数;其次anything与something泛指任何事或某些事,放入句中不符句意;any放入后相当于any of them,即“任何维生素”。注意any一般用于否定或疑问句中.做主语时,谓语动词常用单数,故选A。
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