问题 单项选择题

以下______是有效的IP地址。

A.202.280.130.45

B.130.192.33.45

C.192.257.130.45

D.280.192.33.456

答案

参考答案:B

解析:[知识点] IP地址的直观表示法 [评析] IP地址由32位二进制数值组成(4个字节),但为了方便用户的理解和记忆,它采用了点分十进制标记法,即将4个字节的二进制数值转换成4个十进制数值,每个数值小于等于255,数值中间用“.”隔开,表示成w.x.y.z的形式。

完形填空

Have you ever simply wanted to give without expecting anything in return? It’s  21  to do. Most look for a reward in some way. I know I did, most of the time, but then a TV program of “Oprah” inspired me. She gave everyone in the audience $1,000 to spend on a complete__22__,accompanied by a video camera to ___23 __ what they did with the money.

Two sisters from Georgia  24 from the crowd in my mind---they put their money together to give to “My sister’s House”, a  25 that helps battered(受虐的) women and children. Not only did they  26   their money, but they told everyone in their town about the organization. It was amazing that people were crazy to ring and  27  money, baby clothing, and more.

This story made me realize how often I expect things from others and how  28 I give things in return. I don’t have a thousand dollars to spend on a stranger, but I do have a heart that is full of love and generosity. I now hold doors open for others and  29  at people I don’t know, because a smile is contagious(有感染力的) and I try to bring as much happiness as I can into others’ lives. It’s difficult, but I feel it is really ___30 __.

21. A. hard          B. easy            C. simple            D. hardly

22. A. countrymen    B. stranger        C. acquaintance      D. friend

23. A. show         B. record             C. learn             D. praise

24. A. stood up      B. stood out       C. stood by          D. stood for

25. A. room          B. house           C. village           D. shelter

26. A. spend         B. divide          C. combine           D. separate

27. A. give          B. bring           C. donate            D. take

28. A. often         B. really          C. simply            D. rarely

29. A. sing          B. cry             C. smile             D. laugh

30. A. rewarding     B. awarding        C. expecting         D. giving

名词解释