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Importance of
Vitamins Vitamins, which come in many different types all of which are quite diverse in chemical configuration and function, can be any of several organic substances that are separated into water-soluble and fat-soluble groups. Originally defined as organic compounds obtainable in a normal diet and capable of maintaining life and promoting growth, vitamins are differrent from carbohydrates, fats, and proteins in function, as well as in the quantities in which organisms require them. So critical are vitamins to a body’s essential strength and health that if they are absent from the diet or not properly absorbed by an organism, a specific deficiency disease may develop. The term vitamin originated from "vitamine," a word first used in the early 19th century to designate [单项选择]What does Rich teach（）
A. Music. B. Mathematics. C. Physics. D. Photography. [单项选择]What does Mr. Green teach
A. English. B. Chinese. C. Maths. [单项选择]What subject does the man teach
[简答题]Why should we teach or learn linguistics
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