5. There are generally two different kinds of vitamins, they are __________________________.

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

　　7. One of the main function of vitamin D is to prevent adults from ________________.

　　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 ________________________.

　　Keys:

　　Passage One:

　　1. Y

　　2. N

　　3. NG

　　4. N

　　5. guaranteed

　　6. Internet access

　　7. two customer satisfaction programs / a customer hotline and a customer call-back program

　　8. higher prices of their pizzas

　　9. reckless driving by their drivers

　　10. the same

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