—It's twenty yuan.
A:How many
B:How
C:How much
正方形A1B1C1O,A2B2C2C1,A3B3C3C2,…按如图的方式放置.点A1,A2,A3,…和点C1,C2,C3,…分别在直线y=x+1和x轴上,则点B6的坐标是____.
萝卜是大家熟悉的绿色开花植物,它的结构层次是( )