1 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

No discussion about Chinese culture is complete without mentioning of the Great Wall. It is one of the most amazing     1    (structure) in the entire world. Through more than 2,000 years from the     2    (seven) century BC to the 16th century AD, 19 Dynasties built parts of the Great Wall,     3    (add) up to over 100,000 kilometers. It prevented northern people on horseback     4     attacking people in the south.

The hardships involved in building the Great Wall are beyond     5    (imagine). A Chinese idiom     6    (vivid) expresses the Great Wall, “Efforts joined by many can build the Great Wall.”

Over the centuries, the Great Wall    7    (become) a symbol of strength for the Chinese people. For example, the national anthem, composed by Nie Er,     8    (call) on the people to “build our new Great Wall with our flesh and blood.”

The well-preserved sections we see today were mainly built during the Ming Dynasty (1368

—1644), among    9    the most popular are around Beijing, including Badaling, Mutianyu, Juyongguan, and Simatai. A day tour or     10     long hike along the Great Wall allows you to travel back in time to feel the thousands of years’ changes and the ethos (精神风貌) of the ancient Kingdom of China.