C. Increasing your intake of greens by 2.9 portions a day can greatly improve your health.

　　D. People who increased their intake of greens by 3.3 portions a day were found the most attractive after six weeks.

　　2. Which of the following is NOT the function of carotenoids？

　　A. They can protect against cell damage from pollution and UV rays.

　　B. They can prevent heart disease and cancer.

　　C. They can prevent age-related diseases.

　　D. They can keep you in good health.

　　3. Which of the statements is NOT TRUE according to the passage?

　　A. We've already known eating extreme amounts of carrots can turn skin orange.

　　B. We knew in the past that eating a few more carrots could make us look appealing.

　　C. The research showed the improvement in skin is linked with the levels of carotenoids in it.

　　D. Among hundreds of carotenoids, lycopene is thought to have the most dramatic

　　4. We can infer from the passage that _____.

　　A. skin's redness, yellowness and lightness make a person look more healthy and attractive

　　B. carotenoids have the same effect as lycopene

　　C. it is carotenoids that give tomatoes and red peppers their red colour

　　D. both beta-carotene and polyphenols affect skin colour by causing blood rush to the skin surface

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