问题
单项选择题
下列关于栈的描述正确的是( )。
A．在栈中只能插入元素而不能删除元素
B．在栈中只能删除元素而不能插入元素
C．栈是特殊的线性表，只能在一端插入或删除元素
D．栈是特殊的线性表，只能在一端插入元素，而在另一端删除元素
答案
参考答案：C
解析： 栈实际上也是线性表，只不过是一种特殊的线性表。在这种特殊的线性表中，其插入和删除只在线性表的一端进行。
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下列关于栈的描述正确的是( )。
A．在栈中只能插入元素而不能删除元素
B．在栈中只能删除元素而不能插入元素
C．栈是特殊的线性表，只能在一端插入或删除元素
D．栈是特殊的线性表，只能在一端插入元素，而在另一端删除元素
参考答案：C
解析： 栈实际上也是线性表，只不过是一种特殊的线性表。在这种特殊的线性表中，其插入和删除只在线性表的一端进行。
| 先通读下面的短文，掌握其大意，然后在每小题的A、B、C、D四个选项中选出最佳 选项，并在答题卡上将该项涂黑。 | ||||
| Xiao Qiang, a l 2-year-old Chinese boy, has too many activities. His father __1__ him away from school four afternoons a week and drives him across town to practice. "I do most of my __2__ in the car when we are __3__ to practice, and I have to do the rest (剩下的) when I get home. I am too tried, I just want to sleep." He said. "More and more kids (小孩) become unhappy __4__ they have too many activities to do." said Mr. Wang, an expert (专家) of child development. "4l％of the children aged 9-13 said they felt __5__ most of the time, and more than 75％ 0f them said that they wished they had more __6__ to play." "Over-scheduling (过量的课程安排) is a growing problem (问题) for Chinese families." said Mr. Wang. It is not good for both kids and their parents. More families eat dinner __7__ or often eat fast food __8__ their way to football practice or music lessons. We all know it is important for kids to learn how to relax (放松). If they don't learn that now, it will be more difficult to learn when they get __9__. Kids need time to relax. Parents should __10__ about what is right for kids. | ||||
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