题目内容

China is a large country with four-fifths of the population engaged in agriculture, but only one tenth of the land is farmland, the rest being mountains, forests and places for urban and other uses.

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Part II WritingDirections: Write an essay on the following topic. The topic has an outline you can followTopic:How to Bridge the Generation Gap?The differences between parents and children can be well observed in almost every family.1) have an open discussion2) understand each person has his limitations3) cooperate to build up a close-knit family relationshipEach family can enjoy a cozy atmosphere

主机甲与主机乙之间已建立一个TCP连接，双方持续有数据传输，且数据无差错与丢失。若甲收到1个来自乙的TCP段，该段的序号为2020、确认号为1166、有效载荷为300字节，则甲立即发送给乙的TCP段的序号和确认号分别是

A. 1166，2319
B. 1166，2320
C. 1167，2319
D. 1167，2320

若主机甲主动发起一个和主机乙的TCP连接，甲、乙选择的初始序号分别为2020和1666，则第三次握手TCP段的确认序号是

A. 2019
B. 2020
C. 1666
D. 1667

下列关于UDP协议的叙述中，正确的是I.是TCP/IP参考模型网际层中的协议II.提供无连接服务III.通过差错校验，保证可靠数据传输IV.提供复用/分用服务

A. 仅I
B. 仅I、III
C. 仅II、IV
D. I、II、III、IV