[Answer] The second volume of the first day history. 1. The performance of political enlightenment in the Tang Dynasty. 2. The expression of advanced culture.

2. Ethnic relations: Harmony is a family.

3. External relations: treat foreign countries equally.

1. Technology: Astronomer Monk and his party measured the meridian length for the first time in the world.

2. Poetry: Tang poetry

3. Calligraphy: Yan Zhenqing's "Duota Monument"

4. Painting: Zhang Xuan's "Mrs. Guo Youchun"

5. Art Treasure House: Mogao Grottoes