6.阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

　　You know eating fruit and vegetables is virtuous. But did 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 subtly 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 healthier and an extra 3.3 portion 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 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 at three weeks.

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