A:∠B=∠C
B:AD=AE
C:BD=CE
D:BE=CD
My sister ____ (be) a singer since she left the school.
用斜二测画法作一个边长为2的正方形,则其直观图的面积为( )
如图所示,甲、乙两图是小月同学探究平面镜成像特点的实验情景.