真是张嘴就来啊，还有舔阿三屁眼的。。。网上英文搜一下：The current scientific consensus, based on archaeological and linguistic evidence, is that Oryza sativa rice was first domesticated in the Yangtze River basin in China 13,500 to 8,200 years ago. Cultivation, migration and trade spread rice around the world—first to much of east Asia, and then further abroad, and eventually to the Americas as part of the Columbian exchange. The now less common Oryza glaberrima rice was independently domesticated in Africa around 3,000 years ago. Other wild rice species have also been cultivated in different geographies, such as in the Americas.
这年头有Google，张嘴就胡说的马上现原形
刚搜了 rice origin, google 置顶的回答如下
However, the earliest archaeological evidence comes from central and eastern China and dates to 7000–5000 bce. More than 90 percent of the world's rice is grown in Asia, principally in China, India, Indonesia, and Bangladesh, with smaller amounts grown in Japan, Pakistan, and various Southeast Asian nations.
不错，中国确实在进口大量的粮食，可是中国人民日常的主粮大米和小麦完全自给自足。大量进口的是大豆玉米等油料作物和饲料，因为中国人现在食用的肉类和油脂比四十年前增加了数倍。中国完全有土地和人力来生产这些辅粮，但是中国的人工和生产成本高于国际上的农业国，特别是第三世界的农业国。所以，进口比自产更合算。这纯粹是一个经济学的问题，不是中国的能力问题。