单选题 In computing, passwords are commonly used to limit access to official users. Yet the widespread use of passwords has serious drawbacks. Office workers now have to remember an average of twelve system passwords. In theory they should use different passwords for each site, but in reality these would be impossible to remember, so many people use the same password for all. An additional problem is that the majority use simple words such as "hello", or names of family members, instead of more secure combinations of numbers and letters, such as 6ANV76Y. This permits computer hackers to download dictionaries and quickly find the word that allows them access. When system users forget their passwords there is extra expense in supplying new ones, while if people are forced to change passwords frequently they often write them down, making systems even less secure. Therefore, it is clear that the idea of passwords which have been used as security devices for thousands of years, may need rethinking. One possible alternative has been developed by the American firm Real User, and is called "Passfaces". In order to access the system a worker has to select a series of photographs of faces from a randomly(随机的) generated sequence. If the pictures are selected in the correct order, access is granted. This concept depends on the human ability to recognize and remember a huge number of different faces, and the advantage is that such a sequence cannot be told to anyone or written down, so is more secure. It is claimed that the picture sequence, which used photographs of university students, is easier to remember than passwords, and it has now been adopted for the United States Senate.

单选题"Europe needs to import to export. " That is the slogan of the European Commission's new strategy for securing its economic place in the world, unveiled this week by Peter Mandelson, the European Union's commissioner for trade. The soundbite, of course, gets the economics precisely backwards: exports are the price a country must pay for its imports; Europeans toil away making stuff for others to consume only so they can in turn get their hands on the fruits of foreign labours. But the slogan does capture two awkward truths European exporters must now confront. First, only by offering to open its own markets can the EU hope to persuade foreign countries to open theirs. But with the collapse of the Doha round of trade talks, it is not obvious to whom the Europeans should make their offers. Second, European companies are now part of elaborate global supply chains. Clumsy efforts to protect some of them from foreign competition deprive others of the cheap inputs they need to thrive in world markets. The new trade strategy looks at both of these dilemmas, among others. Though Mr Mandelson insists that he remains wedded to multilateral negotiations at'the World Trade Organisation, he also fancies pursuing a bit on the side with other willing trade partners. The EU will pick its partners according to three criteria: do they offer a big, growing market? Are they cutting deals with America or Japan? And are they guilty of deterring European companies, either repelling them at the border with high tariffs, or bogging them down in cumbersome rules and regulations? The strategy names ASEAN, South Korea, India and Russia as priorities, as well as two regional blocks, Mercosur and the Gulf Co-operation Council, that it is already courting. The EU will reveal its plans for China at the end of the month. The strategy also proposes to look again at how the EU protects its own borders, because its favored weapons are prone to backfire. For example, EU ministers decided this week to slap antidumping duties on leather shoes from Vietnam and China, which threaten shoemakers in Italy, Portugal and Spain. But the duties are opposed by Europe's own retailers and some of its sportswear makers. Letting Asian workers stitch and glue sports shoes makes it possible for such firms to employ Europeans to design and market them. Mr Mandelson presented his strategy as a way to help the EU become more competitive. Opening up to foreign rivals is, of course, an excellent way to foster competition in cloistered domestic industries. A pity then that most of his concrete proposals were about conquering markets abroad, and that the EU is still so ready to raise its defences at home.

单选题Where might this passage come from ?

单选题Consumers had hoped the higher prices would mean more goods in stores. But that was not

单选题There seems never to have been a civilization without toys, but when and how they developed is unknown. They probably came about just to five children something to do. In the ancient world, as is today, most boys played with some kinds of toys and most girls with another. In societies where social roles are rigidly determined, boys pattern their play after the activities of their fathers and girls after the tasks of their mothers. This is true because boys and girls are being prepared, even in play, to step into the roles and responsibilities of the adult world. What is remarkable about the history of toys is not so much how they changed over the centuries but how much they have remained the same. The changes have been mostly in terms of craftsmanship, mechanics, and technology. It is the universality of toys with regard to their development in all part of the world and their persistence to the present that is amazing. In Egypt, the Americas, China, Japan and among the Arctic peoples, generally the same kinds of toys appeared. Variations depended on local customs and ways of life because toys imitate their surroundings. Nearly every civilization had dolls, little weapons, toy soldiers, tiny animals and vehicles. Because toys can be generally regarded as a kind of art form, they have not been subject to technological leaps that characterize inventions for adult use. The progress from the wheel to the oxcart to the automobile is a direct line of ascent. The progress from a rattle used by a baby in 3000 BC to one used by an infant today, however, is not characterized by inventiveness. Each rattle is the product of the artistic tastes of the times and subject to the limitations of available materials.

单选题He is holding a ______ position in the company and expects to be promoted soon. [A] subordinate [B] succeeding [C] successive [D] subsequent

单选题Cirque du Soleil (say it: Serk du So-lay) is being accused of out-dated thinking about the dangers of AIDS. It is a modem acrobatic circus from Canada that tours in the United States and other countries. Last April, the company fired Matthew Cusick because he was HIV positive. This was after he spent four months learning his part in an act. A spokesman for the circus said Cusick was fired for safety reasons. They said he was a danger to others. He disagreed. Hundreds of people picketed a show in San Francisco. They said that firing him was not legal. Cusick says the company knew he was HIV positive when they hired him. It was not fair to let him put so much time into learning his act, and then fire him before he performed. He says he is not a danger to others. People can only get AIDS if infected blood contacts another person's blood, or open wound. The company says what their acrobats do is very, very dangerous. They perform tricks without nets. Someone might fall and get hurt, It could be bloody. They say it is too risky to let a person with HIV take part in an act. People who run the circus say it hurts to be accused of discrimination. Matthew Cusick says he feels hurt that he can't perform in the big blue and yellow tent. Dozens of artists, actors, writers and entertainers got involved in protesting the firing of Matthew Cusick. Some names you might know are: the Actors' Equity Union (45,000 members), Rosie O'Donnell, Rod McKuen, and Chad Allen. They also protested at a showing in Orange County. They said "HIV discrimination is unacceptable./

单选题Bilingual education in New York City was originally viewed as a transitional program that would teach foreign-born children in their native languages until they were fluent enough in English to enter the educational mainstream. But over the last 25 years, bilingual programs at many schools have become foreign-language ghettos from which many children never escape. The need to expose foreign-born students to more English during the school day--and to move them as quickly as possible into the mainstream-was underscored this week in a pair of reports, one from Mayor Rudolph Giuliani's task force on bilingual education and one form Schools Chancellor Harold Levy. The push to reform bilingual education has intensified across the country since the Silicon Valley millionaire Ron k. Unz championed a ballot initiative that ended bilingual education in California two years ago. Opponents of bilingual education want it replaced with the so-called immersion method, in which students are forced to "sink or swim" in classes taught entirely in English. Immersion has at least a chance of success in the early grades, where children are mainly being taught to read and write. But it is a recipe for failure in the upper grades, where older foreign-born students must simultaneously learn English and master complex subjects like math, science and literature. Mayor Giuliani and Schools Chancellor Levy have wisely called for reforming special education instead of dismantling it. Both reports want to end the practice of dragooning children into the system, and call on administrators to offer parents a range of choices. Instead of automatically assigning students to bilingual classes— where they take subjects like mathematics and social studies in their native languages—parents would be allowed to choose other options, including the strategy of English as a second language, in which most instruction is offered in English. Children would be moved into the mainstream as quickly as possible, preferably within three years. But these sensible reforms have little chance of succeeding unless the city and the state act quickly to train and recruit teachers who can perform the needed task. Nearly 30 percent of bilingual instructors are uncertified. Some have not even mastered the languages they have been hired to teach. True reform will require dollars, determination and a qualified teacher in every classroom.

单选题C++ is used with proper____design techniques. A．object-oriented B．object-based C．face to object D．face to target

单选题No sooner ______ from the airport than we were starting to land.

单选题There ______ no buses, we had no choice but ______ at a small hotel for the night.A. were, to stayB. being, to stayC. being, stayD. were, stay

单选题The house ______ green. A) should paint B) should be painted C) must paint D) ought to paint

单选题A controversial decision on whether choice cuts of steak and cartons of milk produced from cloned animals are suitable for the dinner table is now long overdue. Hundreds of pigs, cows and other animals created with the help of cloning are living 1 farms across the United States and 2 the forthcoming ruling will directly 3 American consumers, British holidaymakers may also 4 themselves at the forefront of a food revolution that many commentators expect will 5 arrive here. 6 the birth of Dolly the sheep-the first mammal cloned from an adult cell--there were extreme predictions of herds of genetically 7 bulls and pastures 8 with cloned dairy cows. That double 9 of the past decade has not yet been realized 10 clones have become a familiar sight at agricultural fairs in America, where producers of 11 pigs and cattle have been among the first to 12 cloning, which offers a way to keep 13 traits without inbreeding problems caused by traditional methods. Clones of rare and elite animals, including sheep, goats, and rabbits, 14 a way to improve animal healthy, 15 the nutritional value of meat and milk, and breed animals immune 16 diseases or better suited for developing countries. The safety of cloned 17 has been under examination by various bodies. Three years ago the US National Academy of Science concluded that 18 available data indicated that cloning met animal welfare and food safety considerations, more information was needed. 19 scientific evidence suggests that there is little 20 for alarm, at least on food-safety grounds.

单选题Which of the following would NOT be an example of a public good as described in the passage?

单选题"Clean your plate!" and "Be a member of the clean-plate club!" Just about every kid in the US has heard this from a parent or grandparent. Often, it's accompanied by an appeal. "Just think about those starving orphans (孤儿) in Africa!" Sure, we should be grateful for every bite of food. Unfortunately, many people in the US take a few too many bites. Instead of saying "clean the plate," perhaps we should save some food for tomorrow. According to news reports, US restaurants are partly to blame for the growing bellies (肚子). A waiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government, according to a USA Today story. Americans traditionally associate quantity with value and most restaurants try to give them that. They serve large portions to stand apart from competitors and to give the customers value. They prefer to have customers complain about too much food rather than too little. Barbara Rolls, a nutrition professor at Pennsylvania State University, told USA Today, that restaurant portion sizes began to grow in the 1970s, the same time that the American waistline began to expand. Health experts have tried to get many restaurants to serve smaller portions. Now, apparently, some customers are calling for this too. A restaurant industry trade magazine reported last month that 57 percent of more than 4 000 people surveyed believed restaurants serve portions that are too large; 23 percent had no opinion; 20 percent disagreed. But a closer look at the survey indicates that many Americans who can't afford fine dining still prefer large portions. Seventy percent of those earning at least $150 000 per year prefer smaller portions, but only 45 percent of those earning less than $ 25 000 want smaller. It's not that working class Americans don't want to eat healthy. It's just that, after long hours at low-paying jobs, getting less on their plate hardly seems like a good deal. They live from paycheck to paycheck, happy to save a little money for next year's Christmas presents.

单选题The village ______ I was born and grew up is quite far from here. A. what B. where C. which D. that

单选题Woman: I don"t agree with Mr. Johnson on his views about social welfare. He seems to suggest that the poor are robbing the rich. Man: He might have used better words to express his ideas. But I find what he said makes a lot of sense. Question: What does the man mean?