请同学们在阅读文章第一段落后,选出能够概括该段落大意的选项: 第一段段落大意: A. corn will be processed into various kinds of food, and can be stored for a long time. B. Corn and potato have high nutrition, both are good for human health. C. Corn and potato were found before new America and first harvested by Chinese. D. Corn and potato are from new world and first harvested by native Indians. E. potato is a main food for western countries, it also can be prepared in many kinds of dishes.