单选题A ______can be defined as a minimal unit of meaning.

单选题Male/female, married/single and alive/dead are examples ofA. complementarity.B. gradability.C. synonymy.D. relational opposites.

单选题In section B, you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow.Mark the correct answer to each question on your answer sheet. Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following questions.

单选题Which of the following best states the central idea of the passage?

单选题 Clattering keyboards may seem the white noise of the modern age, but they betray more information than unwary typists realise. Simply by analysing audio recordings of keyboard clatter, computer scientists can now reconstruct an accurate transcript of what was typed including passwords. And in contrast with many types of computer espionage, the process is simple, requiring only a cheap microphone and a desktop computer. Such snooping is possible because each key produces a characteristic click shaped by its position on the keyboard, the vigour and hand position of the typist, and the type of keyboard used. But past attempts to decipher keyboard sounds were only modestly successful, requiring a training session in which the computer matched a known transcript to an audio recording of each key being struck. Thus schooled, the software could still identify only 80% of the characters in a different transcript of the same typist on the same machine. Furthermore, each new typist or keyboard required a fresh transcript and training session, limiting the method's appeal to would-be hackers. Now, in a blow to acoustic security, Doug Tygar and his colleagues at the University of California, Berkeley, have published details of an approach that reaches 96% accuracy, even without a labelled training transcript. The new approach employs methods developed for speech-recognition software to group together all the similar-sounding keystrokes in a recording, generating an alphabet of clicks. The software tentatively assigns each click a letter based on its frequency, then tests the message created by this assignment using statistical models of the English language. For example, certain letters or words are more likely to occur together - if an unknown keystroke follows a "t", it is much more likely to be an "h" than an "x". Similarly, the words "for example'make likelier bedfellows than"fur example". In a final refinement, the researchers employed a method many students would do well to deploy on term papers: automated spellchecking. By repeatedly revising unlikely or incorrect letter assignments, Dr. Tygar's software extracts sense from sonic chaos. That said, the method does have one limitation: in order to apply the language model, at least five minutes of the recorded typing had to be in standard English (though in principle any systematic language or alphabet would work). But once those requirements are met, the program can decode anything from epic prose to randomised, ten-character passwords. This sort of acoustic analysis might sound like the exclusive province of spies and spooks, but according to Dr. Tygar, such attacks are not as esoteric as you might expect. He says it is quite simple to find the instructions needed to build a parabolic or laser microphone on the Internet. You could just point one from outside towards an office window to make a recording. And as he points out, would-be eavesdroppers might not even need their own recording equipment, as laptop computers increasingly come equipped with built-in microphones that could be hijacked. To protect against these sonic incursions, Dr. Tygar suggests a simple remedy: turn up the radio. His computers were less successful at parsing recordings made in noisy rooms. Ultimately, though, more sophisticated recording gear could overcome even background noise, rendering any typed text vulnerable. Dr. Tygar therefore recommends that typed passwords be phased out, to be replaced with biometric scans or multiple types of authorisation that combine a password with some form of silent verification (clicking on a pre-chosen picture in a selection of images, for example). Loose lips may still sink ships, but his research demonstrates that an indiscrcet keystroke could do just as much damage.

单选题New Deal was the program of social and economic reforms introduced by President ______.

单选题______ refers to a long narrative poem that records the adventures of a hero in a nation's history.[A] Ballad[B] Romance[C] Epic[D] Elegy

单选题The area between ______ and ______ is now of ten referred to as the "Silicon Glen".

单选题 In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Mark the correct answer to each question on your ANSWER SHEET. Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following five questions.Now listen to the interview.

单选题"Leave him alone!" I yelled as I walked out of the orphanage gate and saw several of the Spring Park School bullies pushing the deaf kid around. I did not know the boy at all but I knew that we were about the same age, because of his size. He lived in the old white house across the street from the orphanage where I lived. I had seen him on his front porch several times doing absolutely nothing, except just sitting there making funny like hand movements. In the summer time we didn't get much to eat for Sunday supper, except watermelon and then we had to eat it outside behind the dining room so we would not make a mess on the tables inside, About the only time that I would see him was through the high chain-link fence that surrounded the orphanage when we ate our watermelon outside. The deaf kid started making all kinds of hand signals, real fast like. "You are a stupid idiot!" said the bigger of the two bullies as he pushed the boy down on the ground. The other bully ran around behind the boy and kicked him as hard as he could in the back. The deaf boy's body started shaking all over and he curled up in a ball trying to shield and hide his face. He looked like he was trying to cry, or something but he just couldn't make any sounds. I ran as fast as I could back through the orphanage gate and into the thick azalea bushes. I uncovered my home-made bow which I had constructed out of bamboo and string. I grabbed four arrows that were also made of bamboo and they had Coca Cola tops bent around the ends to make real sharp tips. Then I ran back out of the gate with an arrow cocked in the how and I just stood there quiet like, breathing real hard just daring either one of them to kick or touch the boy again. "You're a dumb freak just like him, you big eared creep!" said one of the boys as he grabbed his friend and backed off far enough so that the arrow would not hit them. "If you're so brave kick him again now," I said, shaking like a leaf. The bigger of the two bullies ran up and kicked the deaf boy in the middle of his back as hard as he could and then he ran out of arrow range again. The boy jerked about and then made a sound that I will never forget for as long as I live. It was the sound like a whale makes when it has been harpooned and knows that it is about to die. I fired all four of my arrows at the two bullies as they ran away laughing about what they had done. I pulled the boy up off the ground and helped him back to his house which was about two blocks down the street from the school building. The boy made one of those hand signs at me as I was about to leave. I asked his sister "If your brother is so smart then why is he doing things like that with his hands?" She told me that he was saying that he loved me with his hands. Almost every Sunday for the next year or two I could see the boy through the chain-link fence as we ate watermelon outside behind the dining room, during the summer time. He always made that same funny hand sign at me and I would just wave back at him, not knowing what else to do. On my very last day in the orphanage I was being chased by the police. They told me that I was being sent off to the Florida School for Boys Reform School at Marianna so I ran to get away from them. They chased me around the dining room building several times and finally I made a dash for the chain-link fence and tried to climb over in order to escape. I saw the deaf boy sitting there on his porch just looking at me as they pulled me down from the fence and handcuffed me. The boy, now about twelve jumped up and ran across San Diego Road, placed his fingers through the chain-link fence and just stood there looking at us. They dragged me by my legs, screaming and yelling for more than several hundred yards through the dirt and pine-straw to the waiting police car. All I could hear the entire time was the high pitched sound of that whale being harpooned again.

单选题Judging from the passage, the author ______.

单选题{{B}}TEXT E{{/B}} Cyberspace, data superhighways, multi-media--for those who have seen the future, the linking of computers, television and telephones will change our lives for ever. Yet for all the talk of a forthcoming technological utopia little attention has been given to the implications of these developments for the poor. As with all new high technology, while the West concerns itself with the "how", the question of "for whom" is put aside once again. Economists are only now realizing the full extent to which the communications revolution has affected the world economy. Information technology allows the extension of trade across geographical and industrial boundaries, and transitional corporations take full advantage of it. Terms of trade, exchange and interest rates and money movements are more important than the production of goods. The electronic economy made possible by information technology allows the haves to increase their control on global markets—with destructive impact on the have-nots. For them the result is instability. Developing countries which rely on the production of a small range of goods for export are made to feel like small parts in the international economic machine. As "futures" are traded on computer screens, developing countries simply have less and less control of their destinies. So what are the options for regaining control? One alternative is for developing countries to buy in the latest computers and telecommunications themselves—so-called "development communications" modernization. Yet this leads to long-term dependency and perhaps permanent constraints on developing countries' economies. Communications technology is generally exported from the U. S. , Europe or Japan; the patents, skills and ability to manufacture remain in the hands of a few industrialized countries. It is also expensive, and imported products and services must therefore be bought on credit— credit usually provided by the very countries whose companies stand to gain. Furthermore, when new technology is introduced there is often too low a level of expertise to exploit it for native development. This means that while local elites, foreign communities and subsidiaries of transitional corporations may benefit, those whose lives depend on access to the information are denied it.

单选题What is the "American Dream"?

单选题[此试题无题干]

单选题If a phoneme is substituted for another in a word and the substitution results in a change of the word meaning, the two phonemes are said to be______ A. minimal pair. B. minimal set. C. distinctive phonemes. D. distinctive features.

单选题 In this section you will hear everything ONCE ONLY. Listen carefully and then answer the questions that follow. Mark the correct answer to each question on your coloured answer sheet. Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following five questions. Now listen to the interview.

单选题The Forsyte Saga, the trilogy of John Galsworthy, does not include ______.

单选题In Canada, French and English are coequal official language except in ______, where French is the sole official language. A.Quebec B.Montreal C.Vancouver D.Ottawa

单选题 Questions 1 to 5 are based on a conversation. At the end of the conversation you will be given 10 seconds to answer each of the following five questions. Now listen to the conversation.

单选题Whatstrikesthewomanmostaboutthemalerobberishis