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单选题
The Internet is based on connectionless end-to-end packet service, which traditionally provided best-effort means of data （请作答此空）using the Transmission Control Protocol/Internet Protocol Suite. Although the （ ）design gives the Internet its flexibility and robustness, its packet dynamics also make it prone to congestion problems,especially at （ ）that connect networks of widely different bandwidths.The initial QoS function set was for internet hosts.One major problem with expensive wide-area（ ）links is the excessive overhead due to small Transmission Control Protocol packets created by applications such as telnet and rlogin. The Nagle （ ），which solves this issue,is now supported by all IP host implementations.
A
B
C
D
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答案：
解析：
题目中描述的是互联网基于无连接端到端的包服务，该服务使用传输控制协议/互联网协议套件来提供尽力而为的数据传输方式。根据常识和语境，这里应该是在描述互联网的基础设计，即传输设计，因此正确答案为B，即transportation（传输）。其他选项不符合语境或不符合常识，如transformation（转换）、processing（处理）、progressing（进展）。
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