—I’m feeling terrible and lonely all the time, what should I do?

—______! Try to talk to your friends, and take good care of your health.

A．Go ahead

B．Take it easy

C．That’s right

D．Don’t mention it

某链表中最常用的操作是最后一个元素之后插入一个元素和删除最后一个元素，则最节省时间的存储方式是

A．单链表

B．双链表

C．单循环链表

D．带头节点的双循环链表