文章作者 100test 发表时间 2007:03:23 17:21:48
来源 100Test.Com百考试题网
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, __1__do they construct or build any part of the body. They are needed for 2 foods into energy and body maintenance. There are thirteen or more of them, and if 3 is missing a deficiency disease becomes 4 .
Vitamins are similar because they are made of the same elements