The Great Wall 长城
地理概况
1. one of the greatest wonders of the world,（世界上的奇观之一） 2.the longest wall in the world. 3.a history of more than 2000 years, 4.a symbol of China. 5.are proud of
6.runs across North China like a huge dragon 7.It runs across the northern part of China. 8.It is 6700 kilometers long and 4--5 meters wide .
9.some places are wide enough for five horses or ten men to walk side by side
10.the famous Chinese saying: \"He who does not reach the Great Wall is not a true man.\"