问题 单项选择题

作业调度程序从处于 (27) 状态的队列中选取适当的作业投入运行。 (28) 指把作业提交给系统到作业完成的时间间隔。 (29) 是指作业从进 (27) 队列到被调度程序选中时的时间间隔:假定把下列4个作业同时提交系统并进入 (27) 队列,当使用最短作业优先的调度算法时,作业的平均等待时间是 (30) ;当使用最高优先数优先的调度算法时,作业的平均周转时间是 (31) 。作业运行时间表如表5-8所示。

表5-8 作业运行时间表

作业所需运行时间(小时)优先级
124
259
381
437

27()

A.运行

B.提交

C.后备

D.停止

E.完成

答案

参考答案:C

问答题 简答题
阅读理解

Popular music in America is what every student likes. Students carry small radios with earphones and listen to music before class, after class, and at lunch. Students with cars buy large speakers and play music loudly as they drive on the street. Adult drivers listen to music on the car radio as they drive to work. They also listen to the news about sports, the weather, and the life of American people. Most of the radio programmes are music.

Pop or popular music singers make much money. They make CDs or tapes which radio stations in many places broadcast(广播). Once the popular singer is heard all over the country, young people buy his or her tapes. Some of the money from these tapes comes to the singer. Wherever the singer goes, all the young people want to meet him or her. Now the singer has become a pop star.

There are other kinds of music that are popular among Americans. One is called folk music. It tells stories about the common life of Americans. Another is called western or country music. This was started by cowboys who would sing at night to the cows they were watching. Today, any music about country life and the love between a country boy and his girl is called western or country music.

小题1:________ kinds of music are mentioned(提到) in this passage.

A.Two

B.Four.

C.Three

D.Five小题2:When pop singers ________, they are regarded as pop stars.

A.become popular with their fans

B.make a CD or tape

C.make much money

D.are wanted to sing on the radio小题3:From the passage we know that country music is about ________.

A.the common life of Americans

B.the life of cowboys

C.the country life and love stories

D.the school life in America小题4:What would be the best title for this passage?

A.Western Music

B.Popular Music

C.History of Music

D.American Music