the Yellowstone National Park What do you know about these wonders?Victoria Falls the Terracotta Army Three Gorges Dam the Pyramids in Egyptthe Pyramids in Egyptsky n. 天空grey adj.灰色的 ; 阴沉的Do you know these words?silent adj.寂静的sign n. 迹象；标志silver adj.银色的stream n.小河；小溪c...
