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问题 单项选择题

在市场经济国家，公路、地铁、无线电视大都是由国家而不是由私人来投资的，其合理的经济学解释是，上述部门( )。

A．属于垄断性行业
B．属于公共物品的生产部门
C．具有负外部性的特点
D．关系着国计民生

答案

参考答案：B

解析： 题中所说的公路、地铁、无线电视等生产部门应是属于公共物品的生产部门。

完形填空

One day a farmer’s donkey fell down into a well. The animal cried piteously for hours as the farmer tried to figure out what to do. Finally, he decided that the animal was old, and the well needed   31  (cover) up anyway; the donkey just wasn’t worth saving.

He invited all his neighbors to come over and help   32 . They all took a shovel (铲) and began to shovel some dirt into the well. At first, the donkey realized   33  was happening and cried   34  (terrible). Then, to everyone’s amazement, he quieted down. A few shovel loads later, the farmer finally looked down the well. He   35  (astonish) at what he saw. With each shovel of dirt   36  hit his back, the donkey was doing something   37  (amaze). He would shake it off and take a step up.

  38  the farmer’s neighbors continued to shovel dirt on top of the animal, he would shake it off and take one more step up. Pretty soon, everyone was amazed as the donkey stepped up over   39  edge of the well and happily ran off!

Each of our troubles is a steppingstone. We can get out of the deepest wells just   40  not giving up! Shake it off and take a step up.

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单项选择题

结构化生命周期方法在使用上有一定的局限性，其主要原因是()。

A．事先严格定义需求

B．注重系统功能、过于严格划分工作阶段

C．兼顾数据结构方面不够

D．开发周期过长
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