问题 单项选择题

下面是关于树和线性结构的描述:

线性结构存在惟一的没有前驱的 (14) ,树存在惟一的没有前驱的 (15) ;线性结构存在惟一的没有后继的 (16) ,树存在多个没有后继的 (17) ;线性结构其余元素均存在 (18) ,树其余结点均存在 (19)

由此可见,由于线性结构是一个 (20) 结构,元素之间存在的是 (21) 的关系,而树是一个 (22) 结构,元素之间存在的是 (23) 的关系。

(22)处填()。

A.首元素

B.根结点

C.尾元素

D.叶子

E.惟一的前驱元素和后继元素

F.惟一的前驱(双亲)结点和多个后继(孩子)结点

G.序列

H.一对一

I.层次

J.一对多

答案

参考答案:I

选择题
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Five Smart Habits of Successful Children

Have you ever wondered what actions make the most difference in your children's lives?

Children don't have to be smart to succeed. They don't have to be born rich and famous. All they need is the right outlook and a few smart habits.

Successful children make friends wherever they go. Children who learn to get along with others from an early age are more successful in life.Without them, we'd have no support. Whatever the goal, friends are needed to achieve it. Do your children a favor by encouraging social interaction early.

 2  They don't just hope for success; they are certain of it. They don't complain. They have a smile on their face and get on with the business of living. They feel pain just like the other children. The difference is that they don't let it hinder(妨碍) their progress.

Successful children become successful because they never give up. They fall. They fail. The difference is that they use their mistakes the way they were intended. They embrace failure because it pushes them forward.

Successful children ignore the naysayer (反对者). They don't worry about what other people think. They follow the path that is right for them, regardless of gossip.They are too busy working towards their goals. They do have concern for the feelings of others.

Successful children share their success. They don't forget all the people who helped them get where they were going.They don't criticize(批评) and reject(抛弃) those who are struggling. They take them by the hand and guide them up the ladder.

A.Do you want to be a successful child?

B.Social skills are vital(重要的) to human survival.

C.Successful children look on the bright side.

D.They make just as many mistakes as the other children.E. They take the time to teach others what they have learned.

F. They don't engage in gossip either, because they don't have time for it.

G. In fact, they don't even have to become rich and famous.