—I don't care what people think.
—Well, you ___. You're not alone in this world.
A:can
B:may
C:should
D:will
做自由落体运动的甲乙两物体所受的重力之比为 2:1,下落高度之比为 1:2,则( )
①买一套西装送一条领带:
②西装和领带都按定价的90%付款.
现某客户要到该服装厂购买西装20套,领带x条(x>20).