A:did; spoke
B:have; were speaking
C:had; were speaking
D:had; spoke
如图为某生物体细胞分裂模式图,据图回答.
将1,2,3,…,49,50任意分成10组,每组5个数,在每组中各取一个中位数, 则这10个中位数的和的最大值是 ( )
如图,在平面直角坐标系中,小猫遮住的点的坐标可能是( )