Using light sensors, the researchers showed these red and yellow hues(色调，色相) 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(多酚), found in apples, blueberries and cherries, which cause blood rush to the skin surface.

　　66. From Paragraph 4, we learn that pictures were taken ______.

　　A. three times using a special camera every three weeks

　　B. twice using a sensitive camera every six weeks

　　C. by 35 people when they ate fruit and vegetables

　　D. by 35 people while being monitored to compare the changes

　　67. The word “appealing” (Paragraph 7) can best be replaced by ______.

　　A. frightening

　　B. harmful

　　C. dangerous

　　D. attractive

　　68. The red and yellow colors were related to _______ in their skin.

　　A. the contents of intake

　　B. the levels of carrots

　　C. the time of eating fruit and vegetables

　　D. the amount of carotenoids

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