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2009年12月英语四级考试模拟训练及答案(一)

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Vitamins B

  B group vitamins have a wide range of roles acting as co-enzymes in metabolic pathways. They are found in most plant and animal tissues involved in metabolism, therefore foods such as liver, yeast and dairy products are all rich in B group vitamins. Deficiency of B group vitamins include dermatitis, fatigue and malformation of red blood cells.

  1. An adult needs about 12,000kJ of energy a day from ________.

  A. the cell B. the respiring process of carbohydrates

  C. fats in the cell D. a balanced diet

  2. Carbohydrates are ultimately absorbed into cells in the process of _______.

  A. digestion B. respiration

  C. oxidization D. mobilization

  3. The Essential Amino Acids which build part of proteins can be obtained from______.

  A. stomach B. body tissues

  C. the body D. the diet

  4. The ultimate cause of kwashiorkor is lack of ________.

  A. protein B. carbohydrates

  C. vitamins D. diet

  5. Vitamins are called “micronutrients” in that _________.

  A. excessive fat soluble vitamins can be excreted in the urine B. the body only requires small amount of vitamins

  C. a dose of 3300mg of vitamins can be considered toxic D. the high concentrations of water soluble vitamins are toxic

  6. Night blindness is a disease normally caused by lack of __________.

  A. fat soluble vitamins B. water soluble vitamins

  C. vitamin A D. innate disability

  7. The main function of vitamin D is to prevent adults from ________.

  A. the growth of strong bones B. fracture

  C. a progressive softening of the bones D. calcium uptake from the gut

  8. Although the human body produces vitamin D normally, it fails to do so if there is not enough ______________.

  9. The reason why vitamin C is seen as an antioxidant is that it drives __________ out of the body.

  10. If you are in lack of B group vitamins, you should turn to _______________.

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appreciate [ə'pri:ʃieit]

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vt. 欣赏,感激,赏识
vt. 领会,充分意

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contention [kən'tenʃən]

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n. 争论,争辩,所持的论点 [计算机] 线路争夺

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settled ['setld]

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adj. 固定的;稳定的 v. 解决;定居(settle

 
permitted

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adj. 被允许的 v. 允许(permit的过去分词)

 
command [kə'mɑ:nd]

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n. 命令,指挥,控制
v. 命令,指挥,支配

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attachment [ə'tætʃmənt]

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n. 附件,附著,附属物,依恋,忠诚,依赖
[

 
consistently [kən'sistəntli]

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adj. 一致的,始终如一的

 
deposition [.depə'ziʃən]

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n. 沉积物,沉积作用,免职,[律]宣誓作证,证言

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innocent ['inəsnt]

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adj. 清白的,无辜的,无害的,天真纯洁的,无知的

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fracture ['fræktʃə]

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n. 破碎,骨折
vt. 破碎,破裂

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