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Yungang Grottoes(hi H) in Datong, Shanxi Province, are a world cultural heritage(itp) site with a history that 56(go) back more than 1, 500 years. In Yungang's 45 bigrottoes and more than 200 small grottoes, roughly 59,000 figures of the Buddha57(be)a priceless treasure of human culture58 because of the effects of climate change and natural disasters, the grottoes face