(2) Fang, Du Ruhui, Kaiyuan Shengshi or Kaiyuan Zhi.
(3) Jurchen Mongols
This question examines the historical facts from the Tang Dynasty to the Yuan Dynasty. The imperial examination system was formally established in Yang Di period. Its significance lies in that scholars with humble origins can become officials through examinations, breaking the monopoly of nobles on selecting officials. When Emperor Taizong ruled, the politics was clear and the famous soldiers came forth in large numbers. Among them, Fang and Du Ruhui called it "childlessness". In the early days of the reign of Emperor Xuanzong of the Tang Dynasty (Li Longji), the economy was unprecedentedly prosperous, the warehouses were enriched and the population increased. The Tang Dynasty entered its heyday, which was called "Kaiyuan Shi Sheng" in history. Yue Fei's "gold" against gold was established by the Jurchen nationality. At the end of the Yuan Dynasty, someone wrote a poem: "Hu people have women who interpret Chinese sounds, and Chinese women also demodulate them." This reflects the harmonious relationship between Han and Mongolian.