Analysis of test questions: Dunhuang Grottoes began in sixteen countries and were continuously built in Qing Dynasty, which lasted for 1000 years. Their statues and murals reflect the development of Buddhist art in past dynasties, forming a unique national style of Dunhuang grottoes art system. Among them, the Mogao Grottoes are listed as world cultural heritage by UNESCO. Buddhism was introduced into China from ancient India. So a fits the question.

Comments: Knowledge expansion: Dunhuang murals generally refer to the existing murals in Dunhuang Grottoes. Dunhuang murals include Dunhuang Mogao Grottoes, West Thousand Buddha Cave and Anxi Yulin Grottoes. There are 552 grottoes with over 50,000 square meters of frescoes. It is the cave group with the largest number of murals in China and even in the world, with very rich contents. Dunhuang murals are the main part of Dunhuang art, with huge scale and exquisite skills. Dunhuang murals are rich in content. Like other religious arts, it is an art that describes the image, activities and relationship between God and man, in order to pin people's good wishes and appease people's hearts. Therefore, the style of mural painting is different from that of secular painting. However, any art originates from real life, and any art has its national tradition; Therefore, most of their forms come from the same artistic language and expression techniques and have the same national style. Famous Dunhuang murals include The Story of Nine-colored Deer Saving People, The Biography of Sakyamuni, The Story of Sa Chunna Giving Her Life to Feed the Tiger, etc.