轴对称是指（ ）个图形的位置关系；轴对称图形是指（ ）个具有特殊形状的图形．
2，1
一个正方形的棱长的和是60CM，它的体积是______CM3．
Check carrots，potatoes, onions and any other vegetables_____ and immediately use or throw away any which show signs of rotting.
A．in demand
B．in store
C．on loan
D．on sale
