历年考研英语完型填空1996年
教程:历年考研英语完型填空  浏览:1882  
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    [00:05.10]1996

    [00:06.69]Vitamins are organic compounds necessary

    [00:09.52]in small amounts in the diet

    [00:11.34]for the normal growth and maintenance

    [00:13.45]of life of animals, including man.

    [00:16.49]They do not provide energy, (1)nor do they construct

    [00:19.71]or build any part of the body.

    [00:22.45]They are needed for (2)transforming foods into energy

    [00:25.68]and body maintenance.

    [00:27.72]There are thirteen or more of them,

    [00:29.74]and if (3)any is missing a deficiency disease

    [00:32.58]becomes (4)apparent.

    [00:34.19]Vitamins are similar because they are

    [00:36.20]made of the same elements--usually carbon,

    [00:39.17]hydrogen, oxygen, and (5)sometimes nitrogen.

    [00:43.30]They are different (6)in that their elements

    [00:45.22]are arranged differently,

    [00:47.13]and each vitamin (7)performs one or more

    [00:49.96]specific functions in the body.

    [00:52.17](8)Getting enough vitamins is essential to life,

    [00:55.19]although the body has no nutritional use for

    [00:57.72](9)excess vitamins.

    [00:59.54]Many people, (10)nevertheless, believe in

    [01:02.06]being on the "safe side"

    [01:03.88]and thus take extra vitamins.

    [01:06.11]However, a well-balanced diet

    [01:08.63]will usually meet all the body’s vitamin needs.

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