From the ancient Chinese literature, the word "rice" has appeared in the oracle bone inscriptions of the Shang Dynasty. In the Book of Songs, the word "rice" has been added. Before the Spring and Autumn Period, because of the small amount of rice planted in northern China, rice was classified as "grain, wheat, rice "; in the Song Dynasty, it was upgraded due to a large number of plantings, and the folk even spread the saying" Shuhu is cooked and the world is full "; in the Ming Dynasty, it was more like That said, rice has become the staple food of our country. From this passage we can conclude:. ['Rice cultivation started in the Shang Dynasty.', 'Rice is not produced in the North during the Spring and Autumn Period.', 'Rice is the staple food of the Song Dynasty.', 'Rice has long been one of the grains in ancient China.']