读东南亚图，回答问题．

敦煌莫高窟被称为世界最大的艺术宝库之一，主要是因为(     )

读下列古诗，按要求答题。

                                                                                                  越中览古
                                                                                                     李白
                                                                                 越王勾践破吴归，战士还家尽锦衣。
                                                                                 宫女如花满春殿，只今惟有鹧鸪飞。