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慢速英语视频:Sweet Potatoes as Medicine?

Source: 恒星英语学习网    2015-07-15  我要投稿   论坛   Favorite  

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Researchers have helped to reduce a major health problem with a simple food – the orange sweet potato. A program created to help farmers grow the crop has unexpected and healthy results. Some reports say this is the first time an agricultural program has had a major effect on health.
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