水稻祖宗是生长在热带低洼地上的野生稻，其故乡是中国的南方和印度等地。我国已有近7000年的栽培历史。小麦足迹遍中国，是来自亚州西南部的客人，我国是世界上栽培小麦最古老的国家之一。玉米老家在美州的墨西哥、秘鲁和古巴等地。它传入我国可能有两条途径：一条是15世纪末 Rice ancestors are wild rice growing in tropical lowlands, and their hometown is China’s South and India. China has nearly 7000 years of cultivation history. Wheat is in China throughout the country, coming from the southwestern part of Asia, and our country is one of the oldest countries in the world to cultivate wheat. Corn home in the United States, Mexico, Peru and Cuba. There are probably two ways that it can be introduced into our country: one is at the end of the 15th century