求助，2人英语情景短对话

A: Lool, The Great Wall
B: It's really magnificent!
A: This is a man-made wonder and it is thought of as one of the wonders in the world. Imagine the astronauts in spaces found that it is the only man-made thing that can be seen up there besides the pyramids in Egypt.
B: Look, so many people are here. I am sure that there are thoudsands of people visiting it every day.
A: Yes, there are more than ten of thoudsand visitors climbing The Great Wall every day.
B: What's the length og The Great Wall?
A: Rhe Great Wall menders form East to West for about 6000 kilometers or 12000 li.
B: Yes, the construction of The Great Wall first began during the Warring States period about 2500 years ago. Some small kingdoms built huge walls to protect their territories. When Qin Shihuang unified China in 221 Bc, he decided to have the various sections of the walls linked up and also extended. From then on, we got The Great Wall.
A: Ah, I see. The