You know eating fruit and vegetables is virtuous. But did you know it can also make you look good? Peoplewho increased their int

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问题     You know eating fruit and vegetables is virtuous. But did you know it can also make you look good? Peoplewho increased their intake over just six weeks developed a healthy【B1】______and appeared more attractive,researchers found. Scientists at St. Andrews University found eating them subtly increased yellow and redpigments in the volunteers’ skin. They【B2】______ the food intake of 35 people and took pictures of theirfaces, arms and hands using a【B3】______ camera at the start, and after three and six weeks. Increasingtheir intake of greens by 2. 9 portions a day was found to make the person look more healthy and an extra 3. 3portions could【B4】______ their attractiveness, when their【B5】______ were rated by others. Fruit andvegetables【B6】______ carotenoids, which, known by most people, can【B7】______ cell damage frompollution 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 notknown a small increase was perceptible to others—and was seen as【B8】______. A camera measured changesto the skin’s redness, yellowness and lightness, and found it significantly changed in people who naturallyincreased their intake. These changes were not【B9】______ at three weeks. Researchers showed these redand yellow hues【B10】______the levels of carotenoids(类胡萝卜素)in their skin.
【B4】

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答案enhance

解析 由空格前的情态动词could可知,空格处应填入一个动词。结合录音可知,答案为enhance,意为“增强,美化,提升”。
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