You know eating fruit and vegetables does good. But do you know it can also make you look good? People who increased their intake over just six weeks developed a healthy glow and appeared more attractive, researchers found. Scientists at St Andrews University found eating them slightly increased yellow and red pigments in the volunteers' skin. They monitored the food intake of 35 people and took pictures of their faces, arms and hands using a sensitive camera at the start, and after three and six weeks. Increasing their intake of greens by 2.9 portions a day was found to make the person look more healthy and an extra 3.3 portions could enhance their attractiveness, when their photographs were rated by others.
Fruit and vegetables are rich in carotenoids(类胡萝卜素)，which are known to protect against cell damage from pollution and UV rays, and can also prevent age-related diseases including heart disease and cancer. But while it was known eating extreme amounts of certain vegetables such as carrots could turn skin orange，it was not known a small increase was perceptible(被觉察）to others—and was seen as appealing.
A camera measured changes to the skin's redness, yellowness and lightness, and found it significantly changed in people who naturally increased their intake. These changes were not evident in three weeks. Using light sensors, the researchers showed these red and yellow hues were linked with the levels of carotenoids in their skin. There are hundreds of carotenoids but those thought to have the most dramatic effect are lycopene(番茄红素)—which gives tomatoes and red peppers their red colour—and beta-carotene found in carrots as well as broccoli, squash, and spinach. Skin colour is also affected by chemicals called polyphenols(多元酚)，found in apples, blueberries and cherries, which cause blood rush to the skin surface.
31. What do we know from the research?
A. If you take in a little more fruit and v
egetables, you will obviously look more attractive in three weeks.
B. The researchers took the pictures of the 35 people in the research at different stages.
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.
32. 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.
33.
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
34. 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
35. Which can be the best title of the passage?
A. Eating fruit and vegetables does good.
B. Fruit and vegetables are rich in carotenoids.
C. How to become attractive？
D. Eating fruit and vegetables makes you look good.