—A second，please.I have another call coming through.

—________.I’m not in a hurry.

A．Enjoy yourself

B．Leave me alone

C．Do as you like

D．Take your time

对长度为n的有序单链表，若搜索每个元素的概率相等，则顺序搜索到表中任一元素的平均搜索长度为

A．n/2

B．(n+1)/2

C．(n-1)/2

D．n/4