问题 单项选择题

UNIX是最普遍使用的操作系统之一,下列说法不正确的是

A.UNIX系统的用户进程数目在逻辑上不受任何限制,有较高运行效率

B.UNIX系统大部分采用C语言编写,易读易修改,但速度不如汇编系统,所以现在主流操作系统都采用汇编语言书写

C.提供了精心挑选的系统调用,系统地实现紧凑,简洁而优美

D.提供了多种通信机制如管道通信,软中断通信,消息共享存储器通信等

答案

参考答案:B

解析: 虽然汇编语言编写的程序速度快,但是不易读、不易修且改难移植,所以大多数操作系统采用C语言书写。

单项选择题
阅读理解

阅读理解。

     Travel has been a considerable part of my life and I have made different kinds of joumeys to

many parts of the world. Often in my travels,l was alone, traveling under difficult conditions in

wartime. And I have flown over the oceans many times when I wanted to get quickly from one

place to another. But a sea voyage,especially a long one,has some.thing unusual of its own,and

after taking a few of them,l became interested in the reasons why people take such trips and how

they are affected by them. That is why I wanted to write Life Number Two.

     Some people go for escape from grief or failure, some from a wish not to be very long iri one

place in the world. Others go to celebrate a marriage, or a retirement,and many people take voyages

to enjoy a luxury(享乐) they do not have at home and for shipboard fun. When you put all these

motives (动机)  into a forced companionship (伙伴关系 )  and sometimes an unpleasant one a

voyage can be like a mirror held up to modem  life with  all  its  variety (多样性 ) . Voyages can

be boring but they can give some passengers new view on life,renew courage and awaken a sense

of the size of the world.

     There are many books about ocean voyages,but as a rule they are magazines or diaries of travel.

 Life Number Two is a novel written not mainly to show shipboard life but to tell the stories of a few

people on board,trying their past lives and their possible futures into the narratives(叙述).lt also deals

with some modem socialproblems worth our consideration.

1. The writer spent           in travelling. 

A. all his life

B. the most important part of life

C. the period of wartime

D. much time      ,

2.Life Num,ber Two tells how people feel when they                

A. are alone in their trips    .

B. fly quickly from one place to another

C. are on board a ship for a long time

D. are always in one place of the world    .

3. A sea voyage in one's life is           as the writer says.     

A. sometimes a thing worth doing

B. a waste of time

C. a sign of failure

D. one's strong wish

4. The shipboard life is                 

A. very Liresome

B. very luxurious

C. a reflection (反映) of society

D. very funny