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    The Great Wall of China is the longest wall in the world. It is about 6,000 kilometers long, 7 meters high and 5 meters wide (宽). The Great Wall was built more than (超过) twenty centuries (世纪) ago. It was very difficult to build such a great wall without any modern (现代的) machines. Thousands of men died while they were building the wall.

    Have you ever been to the Great Wall? It is very famous in the world. Many foreigners (外国人) come to visit it every year. They like it very much.