China is a country with a long history and splendid culture. Countless world cultural heritages shine with the wisdom and hard work of the people of China. Combine what you have learned.

(1) Warring States Period; Reason: The combination of flood control and irrigation has made Chengdu Plain a fertile land, which still plays an important role. Or focus on dredging, maintaining ecological balance and protecting the natural environment; Or science, representing the advanced level of water conservancy projects in the world at that time; Or it embodies the wisdom and courage of the ancient working people in China, and it is a successful example of human conquest of nature and coordination of the relationship with nature; It is also the largest, most beneficial and longest-lasting water conservancy project in ancient China. (just write a little)

(2) Laojunyan.

(3) Answer 1: Oracle Bone Inscriptions. It is very valuable to study the history of Shang Dynasty. China's literary history began in Shang Dynasty (just write a little). Answer 2: Simu Wuding. It is the largest bronze found in the world at present; It symbolizes the splendid civilization of that era. (just write a little)

(4) "omitted".