《大清德宗景皇帝实录》：“人手而能用，著耳而得声，坐一室而可对百朋，隔颜色而可亲謦，此亘古未有之便益，故创行未三十年遍于各国。其始止达数十里，现已可通数千里。”对该材料的分析不正确的是[ ]

A．材料反映的是火车的优点

B．该发明是第二次工业革命的成果

C．该发明在清末已经传人中国

D．该发明促进了各地的联系，作者持积极发展的态度

TCP/IP (1) layer protocols provide services to the application (2)running on a computer. The application layer does not define the application itself, but rather it defines(3)that applications need - like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (4)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 (5)layer consists of two main protocol options - the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

空白（1）处应选择（）

A.application

B.transport

C.link

D.network