阅读下面这首唐诗，完成后面题目。

题严陵钓台【注】

张继

旧隐人如在，清风亦似秋。客星沉夜壑，钓石俯春流。

鸟向乔枝聚，鱼依浅濑游。古来芳饵下，谁是不吞钩。

【注】严陵钓台：东汉著名隐士严光（字子陵）当年隐居垂钓的地方。

小题1:首联为何要选“清风”这一意象？尾联表达了作者怎样的思想感情？（5分）

小题2:中间两联虚实结合，请做简要分析。（6分）

Networks can be interconnected by different devices in the physical layer networks can be connected by (71) or hubs．which just move the bits from one network to an identical network．One layer up we find bridges and switches which operate at data link layer．They can accept (72) ，examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer，we have routers that can connect two networks，If two networks have (73) network layer，the router may be able to translate betweenthe packer formats．In the transport layer we find transport gateway，which can interface between two transport connections Finally，in the application layer，application gateways translate message (74) ．As an example，gateways between Internet e-mail and X，400 e-mail must (75) thee-mail message and change various header fields．

A．reapers

B．relays

C．packages

D．modems