用一句话总结Text A 第二段的中心思想。请用英语回答。 Text A 第二段原文: Corn, which is a grain, was grown long before the Europeans reached the New World. Native Americans raised many kinds; for example, sweet corn, popcorn, colored corn and corn for cornmeal. Corn can be eaten either fresh or ground for meal. Probably the most popular breakfast food in America is corn with milk and sliced bananas. Corn is the base used for making bourbon, an alcoholic drink native to America. Corn is also an excellent source of nourishment ,and like the potato it can be stored for a long time.