Passage 2
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 ? usually carbon, hydrogen, oxygen, and 5 nitrogen. They are different
6 their elements are arranged differently, and each vitamin 7 one or more specific functions in the body.
__8__ enough vitamins is essential to life, although the body has no nutritional use for __9_ vitamins. Many people, 10 , 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.
| 1. A. either | B. so | C. nor | D. never |
| 2. A. shifting | B. transferring | C. altering | D. transforming |
| 3. A. any | B. some | C. anything | D. something |
| 4. A. serious | B. apparent | C. severe | D. fatal |
| 5. A. mostly | B. partially | C. sometimes | D. rarely |
| 6. A. in that | B. so that | C. such that | D. except that |
| 7. A. undertakes | B. holds | C. plays | D. performs |
| 8. A. Supplying | B. Getting | C. Providing | D. Furnishing |
| 9. A. exceptional | B. exceeding | C. excess | D. external |
| 10. A. nevertheless | B. therefore | C. moreover | D. meanwhile |
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