—Talking loudly in a library is impolite.

—In fact, we should also  take care not to cough or sneeze loudly in public.

A．look after

B．be careful

C．take care of

D．look up

链表不具有的特点是( )

A．不必事先估计存储空间

B．可随机访问任一元素

C．插入删除不需要移动元素

D．所需空间与线性表长度成正比