1. It is / has been …… since …..
2. And many of them are famous, such as Mount Song, Mount Huang and Mount Emei.
3. Among them, the Changjiang River is the longest one and the second longest one is the Yellow River.
6. It’s a mountain with lots of strange pine trees.
7.It stretches from Shanghaiguan in the east to Jiayuguan in the west .
8.The first emperor ,QinShihuang, joined all these smaller walls together to make the Great Wall.
9. These early walls that were made of packed earth and wood wore away in the rain and wind.
10.The Great Wall was first built by ancient people to separate them from their enemies.
11. The Great Wall is a treasure of Chinese civilization and it is regarded as a symbol of the Chinese nation.