填空题 The Great Wall of China is considered to be the only man-made project seen from the moon. Although it was once thought to have been built entirely during the Qin Dynasty (朝代) between 221 and 208 BC, it is now believed to have been started earlier.
The 15-foot-high, 25-foot-wide, 1,500-mile-long structure was undoubtedly built to keep out invading enemies. To the common people of the empire, who had been forced to build the wall, it was not worth it, however. The wall, and other public works completed by the Qin Dynasty, had caused great losses on the wealth and human life of the country. As a result, an angry population rose up in rebellion (反抗) against the Qin Dynasty, and in 207 BC the Han Dynasty began.
Because of its rich history and magnificent appearance, the Great Wall attracts tourists, scientists, and historians (历史学家) to this day and will continue to do so for generations.

填空题 What is considered the only man-made project seen from the moon? The ______ of China.

填空题 According to the passage, when was the Great Wall built? Even before ______.

填空题 What is the purpose of the builders in building a so great structure? It was undoubtedly built to keep out ______.

填空题 According to the author, why did the people rebel against the Qin Dynasty? Because the wall and other public works had caused ______ on the wealth and human life of the country.

填空题 Why is the Great Wall of China so attractive to the people around the world? Because of its rich history and ______.