题目内容

If you are able to talk easily with strangers, you have enough ________.

A. self-confidence
B. language
C. topics
D. words

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Working late fter work is called _______________.

A. overrun
B. over the top
C. overtime
D. overday

If you have the ________to get a better job, you should take it.

A. money
B. place
C. opportunity
D. energy

链表不具有的特点是________。

A. 插入，删除不需要移动元素
B. 可随机访问任意元素
C. 不必事先估计所需空间
D. 所需空间与线性长度成正比

假设在一个单链表所有有效结点前有一个哨兵结点，且head指向此哨兵结点；则判定该链表有效数据是否为空的条件是________。

A. head==NULL
B. head->next==NULL
C. head->next==head
D. head!=NULL