计算x3•x2的结果是（ ）
A．x6
B．x5
C．x2
D．x
x3•x2=x3+2=x5．
故选B．
Occasions are quite rare ________ I have the time to spend a day with my kids.[ ]
A. who
B. which
C. why
D. when
棕榈叶:手掌______
A．牵牛花:小喇叭 B．羊皮卷:书本C．太阳:月亮 D．郁金香:玫瑰花
