B. improving eyesight
C. preventing cancer
D. reducing the risk of heart disease
【解析】选C。细节理解题。由第三段A food and health expert says that blue and purple foods can prevent blood mass formation, and they also lower the risk of cancer; 第五段The green foods are rich in isothiocyanates, which help resist cancer; 第八段Lycopene in reddish fruits and vegetables is a powerful antioxidant that has been associated with a reduced risk of some cancers和最后一段Orange fruits and vegetables also play a part in preventing cancer, particularly of the lungs and stomach. 可知, 文中提到的几种颜色的食物都有预防癌症的效果。故选C。
3. Which color can help keep us thin according to the passage?
A. Purple. B. Green. C. Red. D. Orange.
【解析】选A。细节理解题。由第二段An analysis of the latest data from the National Health and Nutrition Examination Study found that people who eat purple and blue fruits and vegetables are at a reduced risk for high blood pressure and are less likely to be overweight. 可知选A。
4. The green and orange foods are both rich in ________ .
A. Vitamin A B. folic acid
C. carotene
D. Vitamin K
【解析】选C。细节理解题。从小标题Green下面的段落中发现They are excellent sources of folic acid, Vitamin K, as well as carotene, 从小标题Orange下面的段落中发现The orange foods are also rich in carotene。可知这两种颜色的食物都富含胡萝卜素carotene。
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