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What a fool I have been! Why（）I think of that before?
A . don’t
B . didn’t
C . not
D . do
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Refer to the exhibit. Why has this switch not been elected the root bridge for VLAN1?（）https://assets.asklib.com/images/image2/2018072317201039316.png
A . It has more than one interface that is connected to the root network segment.
B . It is running RSTP while the elected root bridge is running 802.1d spanning tree.
C . It has a higher MAC address than the elected root bridge.
D . It has a higher bridge ID than the elected root bridge.
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Why has Australia always been a continent with few people?（）
A . Because Australia is too far away from Europe.
B . Because Australia is the least mountainous and most level of the world.s continents.
C . Because Australia is separated from the rest of the world by seas.
D . Because most of the continent is hot and dry.
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When fueling has been completed（）.
A . the fuel tank fill pipe should be left open to allow vapors to vent from the tank
B . the engine should be started immediately to prevent vapor lock in the fuel line
C . all hatches should be opened and all compartments should be ventilated
D . open the fuel line and drain a small amount of gasoline into the bilge to clear the line of sediment
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He has been a Captain（）1992.
A . after
B . since
C . before
D . for
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The discussion has been（）until Monday.
A . put up with
B . put off
C . put out
D . put of
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Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）
A . Because carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause asphyxiation
B . Because carbon dioxide breaks down in a fire into carbon monoxide which may cause blood poisoning in the person breathing this gas
C . Because carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gas
D . This action is unnecessary as carbon dioxide is not poisonous nor toxic but is a relatively harmless ga
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A consultant has been asked to do a performance analysis on a database server. Which subsystem should the consultant first analyze and why？（）
A . CPU，because the database replication process requires a considerable amount of CPU time
B . Memory，because the buffer cache requires a large amount of memory to maintain the data in system memory
C . Disk，because it is important to configure a sufficient number of disks to match the CPU processing power
D . Network，because the data returned to the client from the server can be a large subset of the total database
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A Cisco router has been configured, and the copy running-config startup-config command has been issued. When the router is power cycled, the router prompts with: "Would you like to enter the initial configuration dialog? [yes/no]" Why has this occurred?（）
A . There is an error in the router DRAM.
B . Te IOS image is corrupt.
C . The configuration register is set to 0x2142.
D . The TFTP server that contains the router configuration file is unreachable.
E . A boot system configuration command has placed the router into setup mode.
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Progress has been （） in aeroplane design.
A . done
B . made
C . produced
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He has ________ been to Shanghai , has he ?
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Why is the husband able to make adjustment to the change Elisa has been through?
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He has _______ been to Shanghai , has he ?
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If an account or organization is in （ ） , more money has been spent than has been received.
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________ the meeting has not been discussed yet ． A ． Why to hold B ． Where to C ． When to hold D ． Which to
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Which of the following has been used to try to explain why religiously active individuals tend to live longer than non-religious individuals?
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44 Canada has been short of
A talented people．
B timber．
C flesh water．
D money．
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Why did Mr. Simpson say that he couldn't have been driving fast？
A．He had only been driving fifty yards on the main road.
B．He had just come out into the main road.
C．He had stopped fifty yards away.
D．He had always driven under fifty miles an hour.
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Refer to the exhibit. Why has this switch not been elected the root bridge for VLAN1？（）
<img src='https://img2.soutiyun.com/shangxueba/ask/64347001-64350000/64349888/0398b672a5fe93231b8d66737518db9a.png' />
A.It has more than one interface that is connected to the root network segment.
B.It is running RSTP while the elected root bridge is running 802.1d spanning tree.
C.It has a higher MAC address than the elected root bridge.
D.It has a higher bridge ID than the elected root bridge.
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听力原文：Many interesting sites have come up on the Internet in recent years, but one of the most successful sites has been "oldfriends. com". Like all good ideas, this one is very simple. It's just a database of schools that you can add your name and e-mail address or phone number to, so that old friends can log on, find your details and contact you. In the studio today, we have two guests Mark Sorenson, a sociologist who has been investigating this phenomenon and Dr. Julie Arnforth, a psychologist who has recently produced a study of how and why friendships from the past can become very important to us in later life.
Who is speaking？
A．A sociologist
B．An old friend
C．Dr. Julie Arnforth
D．A radio or TV presenter
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Why do children tend to be violent if they have been spanked often？
A．Because spanking brings only fear, which is the origin of violence.
B．Because spanking fails to build a mutual understanding between parents and children.
C．Because their parents have set them a model of violence being accepted.
D．Because children may take it for granted that violence is a way out for problems.
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Why has the Australian government been keenly interested in strengthening ties with Asia？
A) Because Asia is where Australia is located.
B) Because Asia is where Australia's major exports go.
C ) Because Asia is where Australians go and spend their holidays.
D ) Because Asia is where Australia can play a big role in international affairs.
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The onrush of cheap communications, powerful computers and the Internet all explain why many people feel that, nowadays, change is happening ever more rapidly as technological progress accelerates. Moore's law, that the power of microchips doubles every 18 months, has been tested and found correct. This is what gives people the sense of a world shifting beneath their feet.
2. Yet the implication that rapid change is a new phenomenon is again misleading. If you measure the time it takes for a technology to become widely diffused, today's experience does not seem unusual. Take the car. The basic patent for an internal-combustion engine capable of powering a car was fried in 1877. By the late 1920s—50 years later—over half of all American households owned a car.
3. The comparable dates for the computer axe harder to tie down, but the first big computer, based on vacuum valves, was built in 1946. The transistor—the first semiconductor device—was invented at Bell Laboratories in 1948. The first patent for an integrated circuit was filed in 1959. Now, in 1999-50 years after the first one was built—around half of American households own a computer. The pace of introduction has been similar to that of the car.
4. You have to cheat, choosing only the date for the personal computer, say(mid-1970s), or the internet (ditto) to make it seem much more rapid.
Comparing its diffusion among private users is, you might say, unfair to the computer, for that machine's main use is in businesses. On that measure, the best historical analogy is with electrification, and the spread of the electric dynamo into factories.
5. According to Paul David, a historian at Stanford University in California, the first electricity-generating stations had been installed in New York and London in 1881, but it was well into the 1920s before the dynamo became widely used and started to raise productivity. The adoption of the computer in business has also been slow, and failed to have any measurable impact on productivity until very recently.
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【单选题】The reason why they changed their mind to us yet.
A. has not explained B. has not been explained C. did not explain D. was not explained
