1、考博英语-3 及答案解析(总分：88.00，做题时间：90 分钟)一、BPart Vocabula(总题数：20，分数：10.00)1.I dont think its wise of you to_ your greater knowledge in front of the director, for it may offend him.（分数：0.50）A.show upB.show outC.show inD.show off2.According to what you have just said, am I to understand that his new post _ no
2、 responsibility with it at all?（分数：0.50）A.shouldersB.possessesC.carriesD.shares3.The machine needs a complete _ since it has been in use for over ten years.（分数：0.50）A.amendingB.fittingC.mendingD.renovating4.He offered to _ her a hand as the suitcase was too heavy for her to carry.（分数：0.50）A.helpB.sh
3、owC.lendD.borrow5.The patients health failed to such an extent that he was put into care.（分数：0.50）A.tenseB.rigidC.intensiveD.tight6.She worked hard at her task before she felt sure that the results would _ her long effort.（分数：0.50）A.justifyB.testifyC.rectifyD.verify7.A persons calorie requirements v
4、ary _ his life.（分数：0.50）A.acrossB.throughoutC.overD.within8.Criticism and self-criticism are necessary _ they help us to find and correct our mistakes.（分数：0.50）A.by thatB.at thatC.on thatD.in that9.Some journalists often overstate the situation so that their news may create a great _.（分数：0.50）A.expl
5、osionB.sensationC.exaggerationD.stimulation10.We had to _ a lot of noise when the children were at home.（分数：0.50）A.go in forB.hold on toC.put up withD.keep pace with11.However, at times this balance in nature is _, resulting in a number of possibly unforeseen effects.（分数：0.50）A.troubledB.disturbedC.
6、confusedD.puzzled12.A thorough study of biology requires _ with the properties of trees and plants, and the habit of birds and beasts.（分数：0.50）A.acquisitionB.discriminationC.curiosityD.familiarity13.There were many people present and he appeared only for a few seconds, so I only caught a _ of him.（分
7、数：0.50）A.glanceB.glimpseC.lookD.sight14.Im very glad to know that my boss has generously agreed to _ my debt in return for certain services.（分数：0.50）A.take awayB.cut outC.write offD.clear up15.Sometimes the student may be asked to write about his _ to a certain book or article that has some bearing
8、on the subject being studied.（分数：0.50）A.commentB.reactionC.impressionD.comprehension16.In a time of social reform, peoples state of mind tends to keep _ with the rapid changes of society.（分数：0.50）A.stepB.progressC.paceD.touch17.Harry was _ by a bee when he was collecting the honey.（分数：0.50）A.stungB.
9、stuckC.bittenD.scratched18.Although the accident did yew little _ to the car, I still suggest that you drive more carefully next time.（分数：0.50）A.demolishmentB.ruinC.destructionD.damage19.The returns in the short _ may be small, but over a number of years the in- vestment will be well repaid.（分数：0.50
10、）A.intervalB.rangeC.spanD.term20.Generous public funding of basic science would _ considerable benefits for the countrys health, wealth and security.（分数：0.50）A.lead toB.result fromC.lie inD.settle down二、BPart Cloze/(总题数：1，分数：15.00)In the past few decades, remarkable findings have been made in etholo
11、gy, the study of animal social behavior. Earlier scientists hadU (21) /Uthat nonhuman social life was almost totally instinctive or fixed by genetics. Much more careful observation has shown thatU (22) /Uvariation occurs among the social ties of most species, showing that earning is a part of social
12、 life. That is, theU (23) /Uare not solely fixed by the genes.U (24) /U, the learning that occurs is often at an early age in a process that is called imprinting. Imprinting is clearlyU (25) /Uinstinctive, but it is not quite like the learning of humans, it is something in between the two. An illust
13、ration bestU (26) /Uthe nature of imprinting. Once, biologists thought that ducklings followed the mother duck because of instincts. Now we know that. shortlyU (27) /Uthey hatch, ducklings fixU (28) /Uany object about the size of a duck and will henceforth follow it. So ducklings may follow a basket
14、ball or a briefcase if these areU (29) /Ufor the mother duck at the time when imprinting occurs. Thus, social ties can be considerablyU (30) /U, even ones that have a considerable baseU (31) /Uby genetics.Even among the social insects something like imprintingU (32) /Uinfluence social behavior. For
15、example, biologists once thought bees communicated with others purelyU (33) /Uinstinct. But, in examining a “dance“ that bees do to indicate the distance and direction of a pollen source, observers found that bees raised in isolation could not communicate effectively. At a higher level, the genetic
16、base seems to be much more for an all-purpose learning rather than the more specific responses of imprinting. Chimpanzees, for instance, generallyU (34) /Uvery good mother but Jane Goodall reports that some chimps carry the infant. upside down orU (35) /Ufail to nurture the young.（分数：15.00）A.assumed
17、B.adoptedC.believedD.surmisedA.considerateB.consideredC.considerableD.consideringA.statuesB.statusesC.statutesD.staturesA.Whats moreB.HenceC.ButD.HoweverA.notB.onlyC.butD.solelyA.clarifiesB.classifiesC.definesD.outlinesA.thanB.beforeC.whenD.afterA.onB.withC.inD.withinA.appropriatedB.substitutedC.ass
18、ignedD.distributedA.variedB.deviatedC.differedD.alteredA.fashionedB.modifiedC.influencedD.affectedA.mayB.shouldC.mustD.canA.byB.out ofC.fromD.throughA.proveB.makeC.turnD.createA.otherwiseB.stillC.yetD.even三、BPart Reading (总题数：4，分数：40.00)BPassage 1/BToday cognitive theorists empirically study the imp
19、act of feelings on cognitive processes such as memory and judgment and also the reciprocal influence of cognition on emotion. However, evolutionary theorists view emotion as a powerful source of motivation-an internal communication that something must be done. For example, when people are threatened
20、, they feel fear, which in turn leads them to deal with the threatening situation through either fight or flight. Emotions and drives may also operate in tandem to motivate action, as when excitement accompanies sexual arousal. From an evolutionary perspective, different emotions serve different fun
21、ctions. Fear facilitates flight in the face of danger; disgust prevents ingestion of potentially toxic substances such as rotting meat.An emotion that is less well understood is jealousy. Why do people become jealous in intimate sexual relationships? One series of studies tested evolutionary hypothe
22、ses about differences in the concerns men and women have about their partners fidelity. Since females can have only a limited number of children during their lifetimes, to maximize their reproductive success they should be motivated to form relationships with males who have resources and will contri
23、bute them to their offspring. Indeed, cross-cultural evidence demonstrates that one of the main mate selection criteria used by females around the world is mate resources. From a females point of view, then, infidelity accompanied by emotional commitment to the other woman is a major threat to resou
24、rces. A man unlikely to divert re- sources from his mate and her offspring to a casual fling, but the risk increases dramatically if he becomes emotionally involved and perhaps considers switching long-term partners. Hence, a womans jealousy would be expected to focus on her mates emotional commitme
25、nt to another female.For males, the situation is different. If a male commits himself to an exclusive relationship with a female, he must be certain that the offspring in whom he is investing are his own. Since he cannot be sure of paternity, the best he can do is to prevent his mate from copulating
26、 with any other males. In males, then, jealousy would be expected to focus less on the females emotional commitment or resources and more on her tendency to give other males sexual access. Indeed, in species ranging from insects to humans, males take extreme measures to prevent other males from inse
27、minating their mates. In humans, male sexual jealousy is the leading cause of homicides and of spouse battering cross-culturally.（分数：10.00）(1).This passage discusses the _ approach to human emotions.（分数：2.00）A.evolutionaryB.cognitiveC.psychologicalD.economic(2).Evolutionary theorists view emotion as
28、 all of the following except _.（分数：2.00）A.cognitive processesB.a source of motivationC.something promoting actionD.serving various functions(3).The idea presented in the 2nd paragraph can be best described as _.（分数：2.00）A.realisticB.materialisticC.ironicalD.offspring-oriented(4).According to the evo
29、lutionary perspective, womens jealousy ultimately stems from _.（分数：2.00）A.concern over their husbands reproductive abilityB.fear that their husbands resources would be threatenedC.their husbands divided attention to them and their offspringD.their emotional instability resulting from their husbands
30、infidelity(5).According to this passage, a mans jealousy is mainly focused on _.（分数：2.00）A.a concern over their wives resourcesB.the fatherhood of the offspring to whom he is investingC.their mates emotional commitmentD.the legitimacy of their marriageBPassage 2/BWhile hackers with motives make head
31、lines, they represent less than 20% of all net- work security breaches. More common are instances of authorized users accidentally winding up where they should not be and inadvertently deleting or changing data. However, the Internet introduces another concern: some Internet surfers are bound to go
32、where they have no business and, in so doing, threaten to wipe out data to which they should not have access.Before picking a firewall, companies need to adopt security policies. A security policy states who or what is allowed to connect to whom or what. You can group all users by department or clas
33、sification. The better firewall products let you drag and drop groups in a graphical user interface (GUI) environment to define network security easily.Two methods are most often used together to establish an Internet firewall. They are application and circuit gateways, as well as packet filtering.
34、With application and circuit gateways, all packets are addressed to a user-level application on a gate-way that relays packets between two points. With most application gateways, additional packet-filter machines are required to control and screen traffic between the gateway and the networks. A typi
35、cal configuration includes two routers. With a bastion host that serves as the application gateway sitting between them.A drawback to application and circuit gateways is that they slow network performance. This is because each packet must be copied and processed at least twice by all the communicati
36、on layers. Packet-filter gateways, which act as routers between two nets, are less secure than application gateways but more efficient. They are transparent to many protocols and applications, and they require no changes in client applications, no specific application management or installation, and
37、 no extra hardware.Using a single, unified packet-filter engine, all net traffic is processed and then for- warded or blocked from a single point of control. However, most packet filters are state- less, understand only low-level protocols, and are difficult to configure and verity. In addition, the
38、y lack audit mechanisms. Some packet filters are implemented inside routers, limiting computing power and filtering capabilities. Others are implemented as s9ftware packages that filter the packets in application-layer processes, an inefficient approach that requires multiple data copies, expensive
39、delays and context switches and delivers lower throughput.So whats a network administrator to do? Some vendors are developing firewalls that overcome many of these problems and combine the advantages of application gateways and packet filtering. These efficient, protocol-independent, secure firewall
40、 engines are capable of application-level security, user authentication, unified support, and handling of all protocols, auditing and altering. They are transparent to users and to system setup, and include a GUI for simple and flexible system management and configuration.（分数：10.00）(1).The most suit
41、able title for this passage is _.（分数：2.00）A.Hackers and Our DefenseB.Internet Surfers GuideC.Firewall: A Measure of Network SecurityD.Information Technology(2).According to what you have read, the authors probable preference will he _.（分数：2.00）A.walling for the coming of better firewall products,B.f
42、inding a combination of both application gateway and packet filtering approachC.meeting demands of every type with better productsD.implementing one better approach in the adoption of a firewall solution(3).In choosing a firewall product, what is implied as the main concern of the author?（分数：2.00）A.
43、Management.B.Transparency.C.Independence.D.Efficiency.(4).Which of the following can be inferred from the passage concerning the networks using application and circuit gateways?（分数：2.00）A.Secure and speedy.B.Secure but slow.C.Insecure and slow.D.Insecure but speedy.(5).For whom is this passage most
44、likely written?（分数：2.00）A.Government officials.B.Hackers.C.Network. administrators.D.Computer experts.BPassage 3/BThe Internet is a global network that connects other computer networks, together with software and protocols for controlling the movement of data. The Internet, often referred to as “the
45、 Net“, was initiated in 1969 by a group of universities and private research groups funded by the US Department of Defense. It now covers almost every country in the world. Its organization is informal and deliberately nonpolitical; its controllers tend to concentrate on technical aspects rather tha
46、n on administrative control.The Internet offers users a number of basic services including data transfer, electronic mail, and the ability to access information in remote databases. A notable feature is the existence of user groups, which allow people to exchange information and debate specific subj
47、ects of interest. In addition, there are a number of high-level services. For example, MBONE allows the transmission of messages to more than one destination. It is used in videoconferencing. The World Wide Web, known as “the Web“, is another high level Internet service, developed in the 1990s in Ge
48、neva. It is a service for distributing multimedia information, including graphics, pictures, sounds, and video as well as text. A feature of the World Wide Web is that it allows links to other related documents elsewhere on the Internet. Documents for publication on the Web are presented in a form known as HTML (hypertext mark up language). This allows a specification of the page layout and typography as it will appear on the screen. It also allows the inclusion of active links to other documents. Generally, these appear on the screen display as highlighted text or as additi
