TCP/IP (21) layer protocols provide services to the application (22) running on a computer. The application layer does not define the application itself, but rather it defines
(23) that applications need — like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (24) 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 (25) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

A. application B. transport C. link D. network

生态文明体制改革首要解决的问题是（）

A.政府的主导作用

B.健全自然资源资产产权制度

C.政府与市场之间关系的协调

D.市场在资源配置中起决定性作用