问题 单项选择题

在多道程序系统中,每组进程中的每一个进程均无限期地等待被该组进程中的另一个进程所占有且永远不会释放的资源,这种现象称为

A.独占

B.等待

C.睡眠

D.死锁

答案

参考答案:D

解析:[命题目的] 本题主要考查了什么是死锁状态。[解题要点] 在多道程序系统中,每组进程中的每一个进程均无限期地等待被该组进程中的另一个进程所占有且永远不会释放的资源,这种现象称为系统处于死锁状态。[考点链接] 掌握如何解除死锁,以及睡眠、等待、独占的概念。

阅读理解

阅读理解。

 

     One day a man found a cocoon (茧) of a butterfly in the forest. He sat there for several hours and

  watched the butterfly. Suddenly a small opening appeared, and the butterfly made its great effort to

force  its body through that little hole. Then it seemed to stop making any progress. It appeared as if it

had gotten as far as it could and it could go no further.

       So the man decided to help the butterfly. He cut off the remaining bit of the cocoon so that the

  butterfly could come our easily. But to his surprise, the butterfly got a heavy body and very small wings

  when it came out of the cocoon.

       The man continued to watch the butterfly because he expected that the body would grow smaller at

  any moment and the wings would become larger and be able to fly. But neither happened! In fact, the

  butterfly spent the rest of its life crawling (爬) around with a heavy body and small wings. It was never

  bale to fly.

       The man was in his kindness, but he did not understand the nature rules. Before the butterfly came out

  of the cocoon, fluid (流体) from its body must be forced into its wings, and then it would be ready for

  flying. It must have a hard struggle (拼搏) to get through the small opening to get its freedom from the

  cocoon.

       Sometimes struggles are exactly what we need in our life. If God allowed us to go through our life

  without any difficulties, it would make us fail. We would not be as strong as we could have been; we

  could never fly.                

根据材料内容选择最佳答案,并将其标号填入题前括号内。

1. What was the butterfly doing at the beginning of the story?

A. It was trying to make a cocoon for itself.

B. It was struggling to get out of its cocoon.

C. It was flying among the trees in the forest.

D. It was crawling around quietly on the ground.

2. The man cut off the remaining bit of the cocoon _____.

A. to take the butterfly home        

B. to help the butterlfy come out easily

C. to kill the butterfly              

D. to stop the butterfly growing bigger

3. What do you think of the man?

A. Patient but cruel.              

B. Careful and wise.

C. Kind but unwise.              

D. Brave and funny.     

4. What does the last paragraph (段落) tell us?

A. Struggles are sometimes necessary in our life.

B. Nothing is difficult if we put our heart into it.

C. Every good deed will come back with good result.

D. The greatest happiness in the world is to help others.

5. What is the best title for the story?

A. The Love for the Cocoon        

B. The Joy of Helping Each Other

C. The Lesson of the Cocoon        

D. The Expectation for the Butterfly

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