问题 单项选择题

若进栈序列为1,2,3,4,进栈过程中可以出栈,则下列不可能的一个出栈序列是 ______。

A.1,4,3,2

B.2,3,4,1

C.3,1,4,2

D.3,4,2,1

答案

参考答案:C

解析:[评析] 栈是—种后进先出表,选项C中,先出栈的是3,说明此时栈内必然有1,2,由于1先于2进栈,所以1不可能在2之前出栈,故选项C选种出栈序列是不可能的。

完形填空

第二节:语法结构(共10小题;每小题1.5分,满分15分)      

阅读下面短文,根据上下文填入适当的词语,或使用括号中的词语的适当形式

填空,并将答案填在答题卷标号为31~40的相应位置上。

CHILDREN AND GAMES

As we all know, games play a very important role in the growth of children. Children should grow along with playing games;   31           , through playing, they can not only acquire knowledge, but also cultivate their abilities to get along with others.

However, most children are   32           ( face ) with a completely different situation. Most parents fear that games will prevent children from increasing new knowledge and   33            the children will fail in the future examinations. So, instead of   34           ( let ) the children   35            find and learn naturally from their surroundings, they force their children to take part in various kinds of classes, learning English, playing   36           piano or practising drawing, etc. What’s more, some parents put   37            the children’s toys which are very useful in developing children’s imagination and practical abilities.

38          is a piece of good advice to those parents:   39          you want to expect your child to be able to accomplish something, you must first of all develop his ability to adapt to the new surroundings. That cram education can lead to nothing   40          a failure in the children’s growth.

判断题