'What a piece of work is a man! How noble in reason! How infinite in faculty!' These words are uttered by the hero in Shakespeare's Othello.

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  A . The access layer is the initial point at which traffic enters the network. Traffic is marked （orremarked） at Layers 2 and 3 by the access switch as it enters the network， or is "trusted" that it isentering the network with the appropriate tag B . No traffic marking occurs at the core layer. Layer 2/3 QoS tags are trusted from distributionlayer switches and used to prioritize and queue the traffic as it traverses the core C . Traffic inbound from the access layer to the distribution layer can be trusted or reset dependingupon the ability of the access layer switches. Priority access into the core is provided based onLayer 3 QoS tags D . IP precedence， DSCP， QoS group， IP address， and ingress interface are Layer 2 characteristics that are set by the access layer as it passes traffic to the distribution layer. Thedistribution layer， once it has made a switching decision to the core layer， strips these off E . MAC address， Multiprotocol Label Switching （MPLS）； the ATM cell loss priority （CLP） bit， theFrame Relay discard eligible （DE） bit， and ingress interface are established by the voicesubmodule （distribution layer） as traffic passes to the core layer F . The distribution layer inspects a frame to see if it has exceeded a predefined rate of trafficwithin a certain time frame， which is typically a fixed number internal to the switch. If a frame isdetermined to be in excess of the predefined rate limit， the CoS value can be marked up in a waythat results in the packet being dropped

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• What a piece of work is a man! How noble in reason! How infinite in faculty! These words are uttered by the hero in Shakespeare's Othello.

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• Grace is a self-employed artist. She can make 20 pieces of pottery per week. She is considering hiring her sister Kate to work for her. Both she and Kate can make 35 pieces of pottery per week. What is Kate’s marginal product？

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• Work is a very important part of life in the United States. Americans spend most of their lives working. For most Americans, their work defines them. They are what they do. What happensd, then, when a person can no longer work？

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• Building a house costs quite a lot of money. Suppose you plan to build a house. Your first step is to find a right piece of land. Your choice(选择) will depend on many different things. You will probably try to find a sunny place with pleasant surroundings(环境) near shops and bus stops not too far from your friends and the place where you work.

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• The same one word may have more than one meaning. The various meanings of the word are related to some degree. This is what we call (). For example, the word table means a piece of furniture, and it may also mean all the people seated at a table.

  A.polysemy B.hyponymy C.antonymy D.homonymy

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