问题 单项选择题

下列对进程间相互通信的描述错误的是_____ 。

A.进程互斥是指每次只允许一个进程使用临界资源

B.进程控制是通过原语实现的

C.P、V 操作是一种进程同步机制

D.管道不是一种进程高级通信机制

答案

参考答案:D

解析:系统中一些资源一次只允许一个进程使用,这类资源成为临界资源。许多进程常常需要共享资源, 而这些资源往往只能为一个进程服务,进程间的这种关系是进程的互斥。进程控制是通过原语实现的。P、V 操作是一种进程同步机制。所谓管道,就是连接两个进程之间的一个打开的共享文件夹,专用于进程间进行数据通信。它是一种进程高级通信机制。

单项选择题
阅读理解

[1] Many good reasons for parents to send their children to camps.

[2]When children go to camp, they are on their own, sometimes for the very first time in their lives. They have to decide what to wear, what to eat and which activities to participate in. As a result they develop confidence and independence.

[3]As self-respect develops from learning to be on their own, children continue to try new activities. Also it is possible that they will engage in what they are unfamiliar with. In school, children do not experience success in the same way. Camp can be a school without failure because just having fun makes them a success.

[4]One of the greatest benefits of a camp experience is that children develop social skills. In a camp setting, a good counselor will make sure that every camper is included in the activity and that each child interacts with the others in a positive way. They learn to give and take, and they learn how to work and cooperate. Something as simple as clean-up, is not only there to get the cabin clean, but to promote a team atmosphere of working together which in turn results in friendship.

[5]The obvious benefit of camp is that campers make long lasting friendships. These friendships can often be unique and special because campers are living with each other and see the true personalities. Children learn to see others from a different viewpoint. Children tend to be accepted for who they are and do not have to be concerned about what they wear, what they are good at and how they look. This is because in a camp setting, respect and caring finally win out over materialistic objectives. 

[6]In a word, camp does give children fun, friends and fulfillment.

小题1:What do you think may be the best title for this passage? (No more than 10 words)

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小题2:The underlined phrase “on their own” in Paragraph 2 can be replaced by ________.

(No more than one word)

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小题3:According to Paragraph 3, what makes camping different from a school?

(No more than 10 words)

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小题4:What is the main idea of Paragraph 4? (No more than 10 words)

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小题5:According to Paragraph 5, why can camping improve friendship? (No more than 10 words)

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