Answers

2.The Silk Road was pioneered to improve the national powers in the ancient time and has been developing from that era to the modern society ,playing an important role in the communication way to other countries.
3.The most valuable impression is that Zheng He traveled to "visible" country beside our country to bring them some treasures and experience about planting and bring us some grains to our country at the same time.
4.The sculpture not only represents the Chinese ancient traditional culture but also is the symbol of taking off from the China.