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 _______________.

　　Part Ⅳ Reading Comprehension (Reading in Depth) (25 minutes)

　　Section A

　　Directions：In this section，there is a short passage with 5 questions or incomplete statements. Read the passage carefully. Then answer the questions or complete the statements in the fewest possible words on Answer Sheet 2.