The Ancient City of Pingyao is a typical sample of ancient cities in the central part of the country.
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Grottos were carved in cliff faces in various places, particularly in northern China. The_______in Gansu province, the_______in Henan province and the_______in Shanxi province are called the three most important grottos in China.
The Mogao Caves, commonly called the ________ (Qianfodong), is located in Dunhuang county, which is at the western end of the Hexi Corridor.