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

　　69. Among hundreds of carotenoids, which are most effective? ________

　　A. tomatoes and red peppers

　　B. squash, and spinach

　　C. lycopene and beta-carotene

　　D. heir red colour and beta-carotene

　　70. The purpose of the article is to _______.

　　A. tell people a new discovery

　　B. advise people to eat more fruit and vegetables

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