题目内容
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● When a large packet wants to travel through a network whose MTU is too small, one solution is to allow routers to break up the packet into （）. （）A. messages B. frames C. fragments D. bits
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I was wondering through the street when I caught sight of a strange store; there wasn't anything but empty shelves at one end of the room in front of which a man was standing on a【21】platform(平台) and shouting loudly that the greatest sale of the year was【22】to begin. I decided to stay and see【23】would happen. A salesman began to pile【24】of things on the shelves such as table-lamps, clocks, combs and a large quantity of small packets【25】in bright paper. When the man at the table was【26】that a large crowd of peo pie had gathered, he began handing out the packets, asking for the sum(金额) of three pence【27】, and declaring the【28】of the contents was fifty times as much.
I paid three pence for my packet and was【29】told I should not open it until after the sale. All these beautiful things the man announced, would be simply【30】. He was as good as his【31】, for he held up a razor(剃刀) and asked a young man if it was【32】six pence. The young man was【33】the matter and was at once handed the razor for the sum asked.【34】happened with a number of other small articles.
Then【35】asking small sum like six pence, the man began to【36】large amounts (数量)for "very rare, high-quality" objects. The people【37】, thinking that these too were being "given away", soon found themselves【38】a great deal for useless things. I decided I'd better go quickly before being【39】into buying something I didn't want. I went into the street and opened my prize-packet, only to find that I had been【40】with a cheap bottle of scent(香水) !
(31)
A．raised
B．risen
C．placed
D．laid
I paid three pence for my packet and was【29】told I should not open it until after the sale. All these beautiful things the man announced, would be simply【30】. He was as good as his【31】, for he held up a razor(剃刀) and asked a young man if it was【32】six pence. The young man was【33】the matter and was at once handed the razor for the sum asked.【34】happened with a number of other small articles.
Then【35】asking small sum like six pence, the man began to【36】large amounts (数量)for "very rare, high-quality" objects. The people【37】, thinking that these too were being "given away", soon found themselves【38】a great deal for useless things. I decided I'd better go quickly before being【39】into buying something I didn't want. I went into the street and opened my prize-packet, only to find that I had been【40】with a cheap bottle of scent(香水) !
(31)
A．raised
B．risen
C．placed
D．laid
Translate into Chinese. 1.Each cell phone, when it makes a call, is connected (via its antenna and electromagnetic radiation to the base station with the best apparent communication path. The base stations in a given area are connected to a mobile telephone switching office (MTSO) by high speed wire, fiber, or microwave connections. 2.All of the newer cellular systems are digital (I.e., use a binary interface), and thus, in principle, can be used for voice or data. Since these cellular systems, and their standards, originally focused on telephony, the current data rates and delays in cellular systems are essentially determined by voice requirements. 3.One approach to channel measurement is to allocate a certain portion of each transmitted packet for that purpose. During this period, a known probing sequence is transmitted and the receiver uses this known sequence either to estimate the current values for the taps in the discrete-time baseband model of the channel or to measure the actual paths in a continuous-time baseband model. 4.It appears that many wireless situations, particularly those in cellular and local area networks contain a relatively small number of significant coherent paths, and if the bandwidth is large enough to resolve these paths, then the gain is far greater than that indicated in the example above. 5.The resulting binary stream, after adding the long PN sequence, is at a rate of 1.2288 Mbps. This stream is duplicated into two streams prior to being quadrature modulated onto a cosine and sine carrier.
It was as he swung around to look in his toolbox for the cigarettes that Eddie saw the lump. Right in the middle of the brand new bright red carpet, there was a lump. A lump the size of a packet of cigarettes.
"I've done it again？ said Eddie angrily. "I've left the cigarettes under the carpet？
He had done this once before, and taking up and refitting the carpet had taken him two hours. Eddie was determined that he was not going to spend another two hours in this house. He decided to get rid of the lump another way. It would mean wasting a good packet of cigarettes, nearly full, but anything was better than taking up the whole carpet and fitting it again .He turned to his toolbox for a large hammer.
Eddie didn't want to damage the carpet itself, so he took a block of wood and placed it on top of the lump. Then he began to beat the block of wood as hard as he could. He kept beating, hoping Mrs. Vanbrugh wouldn't hear the noise and come to see what he was doing. It would be difficult to explain why he was hammering the middle of her beautiful new carpet... The lump was beginning to flatten out.
After three or four minutes, the job was finally finished. Eddie picked up his tools, and began to walk out to his car. Mrs. Vanbrugh accompanied him. She seemed a little worried about something.
"Young man, while you were working today, you didn't by any chance see any sign of Armand, did you？ Armand is my bird. I let him out of his cage, you see, this morning, and he's disappeared. He likes to walk around the house, and he usually just comes back to his cage after an hour or so and gets right in. Only today he didn't come back. He's never done such a thing before, it's most peculiar..."
"No, madam, I haven't seen him anywhere," said Eddie, as he reached to start the car.
And he saw his packet of Marlboro cigarettes on the panel, where he had left it at lunchtime....
And he remembered the lump in the carpet...
What did Eddie want to do when he had finished fitting the carpet？
A．To have a cigarette.
B．To hammer the carpet flat.
C．To put back his tools.
D．To start work in the dining room.
A. The packet is dropped and the packet‘s source is marked with the no-readvertise parameter.
B. The system sends the packet back to the source.
C. The packet is dropped from the network.
D. The system sends an ICMP message back to the source of the packet.
Passage One
The job was done，and it was time for a last cigarette.Eddie began tapping the pockets of his overalls,looking for the new packet of Marlboro he had bought that morning.It was not there.
It Was as he swung around tO look in his toolbox for the cigarettes that Eddie saw the lump.Right in the middle of the brand new bright red carpet，there Was a lump.A lump the size of a packet of cigarettes.
“I’ve done it again!”said Eddie allgrily.“I’ve left the cigarettes under the carpet!”
He had done this once before，and taking up and refitting the carpet had taken him two hours.Eddie was determined that he was not going tO spend another tWO hours in this house.He decided to get rid of the lump another way.It would mean wasting a good packet of cigarettes，nearly full,but anything was better than taking up the whole carpet and fitting it again.He turned to his toolbox for a large hammer.
Eddie didn’t want to damage the carpet itself,so he took a block of wood and placed it on top of the lump Then he began to beat the block of wood as hard as he could.He kept beating，hoping Mrs.Vanbrugh wouldn’t hear the noise and come to see what he was doing.It would be difficult to explain why he was hammering the middle of her beautiful new carpet….The lump was beginning to flatten out.
After three or four minutes，thejob Was finally finished.Eddie picked up his tools，and began to walk out to his car.Mrs.Vanbrugh accompanied him.She seemed a little worried about something.
“Young man，while you were working today，you didn’t by any chance see any sign of Armand，did you？ Armand is my bird.I let him out of his cage，you see，this morning，and he’S disappeared.He likes to walk around the house，and he usually just comes back to his cage after an hour or so and gets right in.Only today he didn’t come back.He’S never done such a thing before，it’S most peculiar…”
“No，madam，I haven’t seen him anywhere，”said Eddie，as he reached to start the Car.
And he saw his packet of Marlboro cigarettes on the panel,where he had left it at lunchtime…
And he remembered the lump in the carpet….
31.What did Eddie Want tO do when he had finished fitting the carpet？
A. To have a cigarette.
B.To hammer the carpet flat.
C. To put back his tools.
D. To start work in the dining room.
A、A system that uses the store and forward paradigm can keep each data link busy, and thus, decrease overall performance.
B、The forward operation occurs when a packet arrives: I/O hardware inside the packet switch places a copy of the packet in memory.
C、The store operation occurs once a packet has arrived and is waiting in memory.
D、The processor examines the packet, determines its destination, and sends the packet over the I/O interface that leads to the destination.
An internet is a combination of networks connected by (1). When a datagram goes from a source to a？ (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a？ (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet？ The decision is based on optimization: Which of the available (5) is the optimum pathway？
空白（4）处应选择（）
A. destination
B. resource
C. packet
D. source
（71）
A. modems
B. routers
C. switches
D. computers
（72）
A. user
B. host
C. city
D. destination
（73）
A. destinations
B. routers
C. packets
D. computers
（74）
A. destination
B. resource
C. packet
D. source
（75）
A. pathways
B. routers
C. diagrams
D. calls
An internet is a combination of networks connected by (1). When a datagram goes from a source to a？ (2), it will probably pass many (3) until it reaches the router attached to the destination network. A router receives a？ (4) from a network and passes it to another network. A router is usually attached to several networks. When it receives a packet, to which network should it pass the packet？ The decision is based on optimization: Which of the available (5) is the optimum pathway？
空白（5）处应选择（）
A. pathways
B. routers
C. diagrams
D. calls
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