问题 单项选择题

以下网络地址中属于A类地址的是()。

A.11.10.20.1

B.194.158.24.1

C.151.142.1.1

D.127.0.0.1

答案

参考答案:A

解析:

[分析]:本题考查IP地址的基础知识。

IP地址是标识Internet上所有计算机的唯一标志。IP地址是由4组被“.”隔开的32位的二进制数,每组是8位二进制数。为表示方便,每组的8位二进制数都用一个十进制数表示,因此常用4组十进制数表示IP地址,每组十进制数的取值范围都是0~255。按照IP地址第一组数值的取值范围,IP地址可以分为A、B、C、D、E这5类,常用的有A、B、C三类。A类地址的第一组数值的范围为1~126,B类地址第一组数值的范围为128~191,C类地址的第一组数值的范围为192~223。

完形填空
A true friend is always helpful. I didn’t believe it        one thing happened to me when I was in Grade 7.
Li Jie was one of my classmates. He and I were also neighbours. He always listened to his mother        I didn’t like listening to my mother. I didn’t think it was necessary for      to teach me anything. Li Jie knew all about that but he said        to me.
One weekend, Li Jie invited me to watch a film. I liked films very much so I went to the        with him happily. The film was about the love between a       and her son. After watching it, I began to know how great the love of the mother was. I felt        that I didn’t listen to my mother before. I decided to think more about my mother than about       . After I told that to him, Li Jie smiled and said, “It’s really necessary for you to watch such a film. That was a good choice (选择) for both you and me.”
Suddenly, I knew        he invited me to watch the film. Just at that time, I knew a true friend is always       .
小题1:
A.whenB.afterC.untilD.because
小题2:
A.andB.butC.soD.or
小题3:
A.herB.youC.himD.them
小题4:
A.somethingB.anythingC.everythingD.nothing
小题5:
A.parkB.cinemaC.museumD.zoo
小题6:
A.motherB.fatherC.sisterD.brother
小题7:
A.happyB.boredC.sorryD.interested
小题8:
A.myselfB.herselfC.himselfD.yourself
小题9:
A.howB.whereC.whatD.why
小题10:
A.generousB.hard-workingC.smartD.helpful
多项选择题