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主机A基于TCP向主机B连续发送3个TCP报文段。第1个报文段的序号为90，第2个报文段的序号为120，第3个报文段的序号为150。考虑在一条具有10ms来回路程时间的线路上采用慢启动拥塞控制而不发生网络拥塞情况下的效应，接收窗口24KB，且最大段长2KB。那么，需要多长时间才能发送第一个完全窗口

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Questions 7 to 10 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. The brain spreads resources ______ if it’s busy focusing on many aspects of a task.

A. averagely
B. thickly
C. thinly
D. wildly

Questions 7 to 10 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. What is the passage mainly about

A. To explain that people are born to compute.
B. To illustrate children’s counting skills.
C. To prove that people gradually learn to compute.
D. To suggest the ways to learn computing.

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Questions 4 to 6 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. The experts predict that one strong sales area of the show will be ______.

A. netbook
B. mobile phone
C. three-D TV
D. digital tablet

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主机H通过快速以太网连接Internet，IP地址为192.168.0.8，服务器S的IP地址为211.68.71.80。H与S使用TCP通信时，在H上捕获的其中5个IP分组如表1所示。表1编号IP分组的前40字节内容(十六进制)145 00 00 30 01 9b 40 00 80 06 1d e8 c0 a8 00 08 d3 44 47 500b d9 13 88 84 6b 41 c5 00 00 00 00 70 02 43 80 5d b0 00 00243 00 00 30 00 00 40 00 31 06 6e 83 d3 44 47 50 c0 a8 00 0813 88 0b d9 e0 59 9f ef 84 6b 41 c6 70 12 16 d0 37 e1 00 00345 00 00 28 01 9c 40 00 80 06 1d ef c0 a8 00 08 d3 44 47 500b d9 13 88 84 6b 41 c6 e0 59 9f f0 50 f0 43 80 2b 32 00 00445 00 00 38 01 9d 40 00 80 06 1d de c0 a8 00 08 d3 44 47 500b d9 13 88 84 6b 41 c6 e0 59 9f f0 50 18 43 80 e6 55 00 00545 00 00 28 68 11 40 00 31 06 06 7a d3 44 47 50 c0 a8 00 0813 88 0b d9 e0 59 9f f0 84 6b 41 d6 50 10 16 d0 57 d2 00 00 回答下列问题。表1中的IP分组中，哪几个是由H发送的哪几个完成了TCP连接建立过程哪几个在通过快速以太网传输时进行了填充

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