△ABC的三个顶点的坐标分别为A(1,1)B(3,1)C(3,3),请建立平面直角坐标系.
(1)在坐标系中作出△ABC.
(2)作出△ABC关于y轴对称的△A1B1C1,并写出A1、B1、C1各点的坐标.
There were two students in the class buildings during the earthquake, but of them failed to run out.
山颠白雪皑皑、冰川广布的地形区是( )