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针对用户的需求，设计师提出了用物理隔离来实现网络安全的方案。经过比较，决定采用隔离网闸实现物理隔离。物理隔离的思想是（50），隔离网闸的主要实现技术不包括（51）。 空白处（51）应选择（）
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The network layer provides services to the transport layer. It can be based on either（71）. In both cases，its main job is （72） packets from the source to the destination. In network layer，subnets can easily become congested，increasing the delay and（73）for packets. Network designers attempt to avoid congestion by proper desing,Techniques include （74） policy，caching，flow control，and more. The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service. The methods that can be used for this include buffering at the client，traffic shaping，resource（75），and admission control. Approaches that have been designed for good quality of service include integrated services (including RSVP), differentiatd services, and MPLS. 空白处(71)应选择（）
假定你是李华，希望通过外籍教师Peter找一位英语笔友。请写一封短信，描述一下你理想中笔友的条件，并说明为什么选这样的笔友。具体条件包括：l．年龄；2．性别；3．爱好(旅游、运动、宠物等)。注意：1．词数在100词左右；2．可以适当增加细节，以使行文连贯；3．开头语已为你写好。 Dear Peter， I am writing to ask whether you are able to do me a favor．
D Two farmers were on their way home one evening after a hard day’s work．Both were tired．They happened to look up at the sky and SaW a black cloud overhead． “Ah!”said one farmer，“tomorrow we shall have rain and the rice will grow well．”The second answered，“Nonsense，the rain will only kill the crops．” So they began to quarrel．Just then a third farmer clime along and asked them why they were quarrelin9．Both farmers explained about the black cloud． “What cloud”asked the third farmer．They all looked at the sky．The cloud was no longer there． The two farmers were ．
11,22,,44,88,( )
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