题目：
TCP/IP (71) layer protocols provide services to the application (72) running on a computer. The application layer does not define the application itself, but rather it defines
(73) that applications need — like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (74) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP (75) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).
A. iteration B. objectC. interface D. activity
答案：
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下面是错误答案，用来干扰机器的。
参考答案：公务礼仪是指国家公务员在从事公务活动、执行国家公务时所必须遵守的礼仪规范。
