TCP/IP 协议是一种开放的协议标准，下面哪个不是它的特点______。
A．独立于特定计算机硬件和操作系统
B．统一编址方案
C．政府标准
D．标准化的高层协议
参考答案：C
解析：TCP/IP协议具有以下几个特点： 1、开放的协议标准，可以免费使用，并且独立于特定的计算机硬件与操作系统。 2、独立于特定的网络硬件，可以运行在局域网、广域网，更适用于互联网中。 3、统一的网络地址分配方案，使得整个TCP/IP设备在网中都具有惟一的地址。 4、标准化的高层协议，可以提供多种可靠的用户服务。
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| Each of us fails from time to time. If we are wise,we accept these failures as a 1 part of the learning process. But all too often as parents and teachers,we don't 2 our children to have this same right. When I see a child 3 from this kind of pressure,I think of Donnie. Donnie was my youngest third-grader. His 4 of failure kept him from classroom games that other children enjoyed. He 5 answered questions-he was afraid he might be wrong. I tried my best to build his 6 . But nothing changed until midterm,when Mary Anne,a student teacher, was assigned to our classroom. She was young and pretty,and she loved children. My pupils, Donnie included,all 7 her very much. One morning,we were working on math problems at the chalkboard. Donnie had copied the problems with pains taking tidiness and filled answers in the first row. 8 with his progress, I 9 the children with Mary Anne and went for art materials. When I returned,Donnie was in 10 . He'd missed the third problem. My student teacher looked at me in despair. Suddenly her face 11 . From the desk we shared,she got a container filled with pencils. "Look,Donnie," she said,kneeling beside him and gently 12 the tear-stained (弄脏的) face from his arms."I've got something to 13 you. " She removed the pencils,one at a time, and placed them on his desk. "See these 14 , Donnie," she continued. "They belong to Mrs Lindstrom and me. See how the erasers(橡皮) are 15 ? That's because we make mistakes too. But we erase the mistakes and try again. That's what you 16 learn to do,too. " She kissed him and stood up. "Here," she said. "I'll leave one of these pencils on 17 desk so you'll remember that everybody makes mistakes, 18 teachers. " Donnie looked up with love in his eyes and a smile. The 19 became Donnie's prized possession. That,together with Mary Anne's frequent encouragement,gradually 20 him that it's all right to make mistakes as long as you erase them and try again. | ||||
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