问题 单项选择题

设计作业调度算法时不需要考虑下列哪一个因素

A.用户界面友好

B.公平性

C.均衡使用资源

D.吞吐量大

答案

参考答案:A

解析:作业调度算法一般应考虑以下3个基本目标:①尽量提高系统的作业吞吐量,即每天处理尽可能多的作业。②尽量使用CPU和外部设备,保持忙碌状态,以提高资源利用率。③对各种作业合理调度,使所有用户都满意。

阅读理解

Kelly is an African elephant. Now she is 19 years old. She lives in the zoo. Kelly has produced more than 100 paintings since last year. She has made over $ 3,500 for the zoo. Zoo leaders say Kelly first showed the art ability about 5 years ago. Zoo workers watched her make the marks in the sand with her trunk(象鼻). She rubbed out(抹去) the marks, then made the new ones. The zoo workers gave her brushes and paints. Soon Kelly was painting pictures. Newspaper reporters wrote about Kelly, and then people went to buy her pictures. And in this way she made a lot of money for the zoo by painting.

This is how Kelly does the painting. A zoo worker holds different color paints and Kelly touches the colors she wants. Then the worker gives her the chosen colors to the brushes in her trunk and Kelly begins to paint.

小题1:We most probably read this story in     .

A. a magazine     B. a newspaper      C. a history textbook

小题2:Kelly first learned to draw pictures      .

A. in the sand with her trunk      

B. to make money

C. when she was 5 years old

小题3:People asked for Kelly's pictures because      .

A. they just wanted to have fun

B. the zoo leaders asked them to do so

C. the zoo workers asked them to do so

小题4:Kelly rubbed out the marks she had made in order to        .

A. make other ones        B. clean her trunk       C. ask for more brushes and paints

小题5:From the story we can know that       .

A. Kelly can draw nice pictures all by herself

B. Kelly doesn't like to draw pictures at all

C. Kelly can draw pictures with the help of the zoo workers

问答题 简答题