某钢铁厂去年1月份某种钢的产量为5000吨,3月份上升到7200吨,设平均每月的增长率为x,根据题意,得( )
A:5000(1+x2)=7200
B:5000(1+x)+5000(1+x)2=7200
C:5000(1+x)2=7200
D:5000+5000(1+x)+5000(1+x)2=7200
平面直角坐标系中A,B两点位置如图所示,C点与B点关于x轴对称,
(____)A. Orange, orange. Sit down.
(____)B. Black, black. Stand up.
(____)C. White, white. Touch the ground.
(____)D. Brown, brown. Turn around.
(____)E. Red, red. Carry your bag.
靠卵繁殖后代的动物叫____。