单选题It is possible to approach the problem in a different way.

单选题He has trouble understanding that other people judge him by his social skills and {{U}}conduct{{/U}}. A. style B. behavior C. mode D. attitude

单选题{{B}}第二篇{{/B}} Black Holes Trigger Stars' Self-destruction Scientists have long understood that super massive (大块的) black holes weighing. Millions or billions of suns can tear apart stars that come too close. The black hole's gravity (地心引力) pulls harder on the neatest part of the star, an imbalance that pulls the star apart over a period of minutes or hours, once it gets close enough. Scientists say this uneven pulling is not the only hazard (冒险) facing the star. The strain of these unbalanced forces can also trigger (触发) a nuclear explosion powerful enough to destroy the star from within. Matthieu Brassart and Jean-Pierre Luminet of the Observatoire of the Paris in Meudon, France, carried out computer simulations of the final moments of such an unfortunate star's life, as it veered towards a supermassive black hole. When the star gets Close enough, the uneven forces flatten it into a pancake shape. Some previous studies had suggested this flattening would increase the density and temperature inside the star enough to trigger intense nuclear reactions that would tear it apart (扯开). But other studies had suggested that the picture would he complicated by shock waves generated during the flattening process and that not nuclear explosion should occur. The new simulations investigated the effects of shock waves in detail, and fund that even when their effects are included; the conditions favor a nuclear explosion. "There will be an explosion of the star. It will be completely destroyed," Brassart says. Although the explosion obliterates the star, it saves some of the start's matter from being devoured by the black hole. The explosion is powerful enough to hurt much of the star's matter out of the black hole's reach, he says. The devouring of stars by black holes may already have been observed, although at a much later stage. It is thought that several months after the event that rips the star apart, its matter starts swirling into the hole itself. It heats up as it does so, releasing ultraviolet light and X-rays. If stars disrupted (使分裂) near black holes really do explode, then they could in principle allow these events to be detected at a much earlier stage, says Jules Halpern of Columbia University in New York, US. "It may make it possible to see the disruption of that star immediately if it gets hot enough. " Brassart aggress. "Perhaps it can be observed in the X-rays and gamma rays, but it's something that needs to be more studied , "he says. Supernova researcher Chris Fryer of the Los Alamos National Laboratory in Los Almos, New Mexico, US, says the deaths of these stars are difficult to simulate, and he is not sure whether the researchers have proven their case they exploded in the process.

单选题For many years the poor woman was Ua virtual prisoner/U in her own home.

单选题Norman Blarney is an artist of deep Uconvictions/U.

单选题One factor that can influence consumers is their mood state. Mood may be defined (51) a temporary and mild positive or negative feeling that is generalized and not tied to any particular circumstance. Moods should be (52) from emotions which are usually more intense, (53) to specific circumstances, and often conscious. In one sense, the effect of a consumer's mood can be thought of in (54) the same way as can our reactions to the (55) of our friends-when our friends are happy and "up" ,that tends to influence us positively, (56) when they are "down", that can have a (57) impact on us. Similarly, consumers operating under a (58) mood state tend to react to stimuli (刺激因素) in a direction (59) with that mood state. Thus, for example, we should expect to see consumers in a positive mood state evaluate products in more of a (60) manner than they would when not in such a state. (61) ,mood states appear capable of (62) a consumer's memory. Moods appear to be (63) influenced by marketing techniques. For example, the rhythm, pitch, and volume of music has been shown to influence behavior such as the (64) of time spent in supermarkets or intensions to purchase products. In addition, advertising can influence consumers' moods which, in (65) , are capable of influencing consumers' reactions to products.

单选题Marxism doctrine was spelled out in the Communist Manifesto. A. evaluated B. detailed C. supported D. mentioned

单选题Most of the pioneers of low-temperature physics expected gases to liquefy, but none of them predicted superconductivity. This phenomenon was discovered in 1911 by Onnes while he was studying frozen mercury. More than 40 years passed before physicists were able to offer an explanation for superconductivity. The accepted theory, developed in the 1950s, holds that the fundamental behavior of electrons changes at very low temperatures because of the effects of quantum mechanics. Electrons are tiny particles that make up the outer part of an atom, circling rapidly around the nucleus of the atom. In a regular conductor—a metal that conducts an electric current—the outermost electrons are not bound tightly to the atoms, and so they move around relatively freely. The flow of these electrons is an electric current. At normal temperatures, a conductor's electrons cannot move completely freely through the metal because they are "bumped around" by the metal's atoms. But according to the leading theory of superconductivity, when a metal is very cold, electrons form pairs. Then, like couples maneuvering on a crowded dance floor but never colliding, the paired electrons are able to move unimpeded through the metal. In pairing up, it seems, the electrons are able to "blend together" and move in unison without resistance. This explanation seems to account for superconductivity at extremely low temperatures, but in 1986 scientists in Switzerland found that some metal-containing ceramics are superconductors at much higher temperatures. By 1992, scientists had developed ceramics that become superconducting at - 297'F, and some researchers speculated that room-temperature superconductors may be possible. Scientists are still trying to formulate a theory for high-temperature superconductivity. The new ceramic materials can be maintained at their superconducting temperatures, with relatively inexpensive liquid nitrogen rather than the much colder and much more costly liquid helium required by metal superconductors. The cost difference could make superconductivity practical for many new technologies. For example, magnetically levitated trains, which require superconducting electromagnets, would be much cheaper to build than they are now. Superconducting devices might also be used for advanced power transmission lines and in new types of compact, ultrafast computers. But for the time being, superconductivity is finding application mostly in scientific research and in some kinds of medical imaging devices.

单选题Facebook Wants to "Listen" to Your Music and TV Facebook is to release a new feature on its mobile app that "listens" to your music and TV shows. If the song or show is recognized by the app, users can publish the information on their profile or to selected friends. The service hopes to take advantage of the "second screen" trend, which sees fans of TV shows in particular sharing their experiences on social networks. However, some users have privacy concerns. The feature, which will be available in a few weeks" time, uses the microphones inside users" smartphones to detect nearby music or TV shows. As the user begins writing a status update, a small animated icon will appear at the top of the app. If the app detects the appropriate audio signals and finds a match from its database, the user can then share what he or she is watching or listening to. Facebook says the feature can be turned off at any time, the audio recording is not stored anywhere and the device cannot identify background noise or conversations. "If you share music, your friends can see a 30-second preview of the song. For TV shows, the story in News Feed will highlight the specific season and episode you"re watching," Facebook said in a statement. The company hopes this new method of sharing user listening and watching habits will take advantage of the five billion status updates related to TV and music experiences that the social networking giant sees on a yearly basis. However, automating part of the sharing process has left some users suspicious, with Nicole Simon commenting on TechCrunch that: "While the idea is nice and technology really interesting, I have no interest in Facebook "observing" my audio and surrounding. Yes, it starts currently as opt-in, and only on occasion, but there is no trust from my side for even that." The BBC understands that this new feature was not specifically designed to enhance Facebook"s advertising. However, the company could push an advertisement to a user"s phone based on their tracked listening habits. This is in keeping with Facebook"s current approach to advertising, which uses publicly provided information on users" profiles to push advertisements that are more relevant to each individual user. The basic idea behind Facebook"s feature is not a new one—since 2002 Shazam, which has recently seen a $3 million investment from Sony Music Entertainment, has been providing a similar audio recognition service, with its website describing itself as "a mobile app that recognizes music and TV around you". Facebook"s much larger user base could pose a future threat to the comparatively smaller company.

单选题As he had already {{U}}been accustomed{{/U}} to living in the countryside, Jackson refused to move to the city.

单选题This remarkable technology provides far greater Uclarity/U than conventional x-ray.

单选题Sleep Necessary for Memories Burning the midnight oil before an exam or interview does harm to the performance according to a recent research which found that sleep is necessary for memories to be taken back into the brain. A．good night's sleep within 30 hours of trying to remember a new task is a required condition of having good recall in the weeks ahead, scientists have found. The research, published in the December issue of Nature Neuroscience, showed that it was the act of sleep, rather than the simple passage of time, that was critical for long- term memory formation. "We think that getting that first night's sleep starts the process of memory consolidation (巩固)," said Robert Stickgold, a sleep researcher at Harvard Medical School who conducted the latest study. "It seems that memories normally wash out of the brain unless some process nails them down. My suspicion is that sleep is one of those things that does the nailing down," Professor Stickgold said. With about one in five people claiming that they are so chronically short of sleep that it affects their daily activities, the latest work emphasizes the less well-understood side effect—serious memory impairment (损害). Volunteers in an experiment found it easier to remember a memory task if they were allowed to sleep that night. But for those kept awake, no amount of subsequent sleep made up for the initial loss. Professor Stickgold's team trained 24 people to identify the direction of three diagonal (斜线形的) bars flashed for a sixtieth of a second on a computer screen full of horizontal (水平的) stripes. Half of the subjects were kept awake that night, while the others slept. Both groups were allowed to sleep for the second and third nights to make up for any differences in tiredness between the volunteers. Those who slept the first night were significantly and consistently better at remembering the task while the second group showed no improvement despite enjoying two nights of catch-up sleep.

单选题Mary looked pale and weary .

单选题Which of the following statements is NOT true, according to the passage?

单选题Theatre censorship has been Uabolished/U in Britain.

单选题 阅读下面这篇短文，短文后列出7个句子，请根据短文的内容对每个句子做出判断。 {{B}} Coming Soon to a Theater near You!{{/B}} What are special effects? Do you enjoy movies that use a lot of special effects? Dinosaurs (恐龙) from the distant past! Space battles from the distant future! There has been a revolution in special effects, and it has transformed the movies we see. The revolution began in the mid-1970s with George Lucas's Star Wars, a film that stunned (使震惊) audiences. That revolution continues to the present with dramatic changes in special effects technology. The company behind these changes is Lucas's Industrial Light ＆ Magic (ILM). And the man behind the company is Dennis Muren, who has worked with Lucas since Star Wars. Muren's interest in Special effects began very early. At the age of 6, he was photographing toy dinosaurs and spaceships. At 10, he had an 8-millimeter movie camera and was making these things move through stop motion. (Stop motion is a process in which objects are shot with a camera, moved slightly, shot again, and so on. When the shots are put together, the objects appear to move. ) Talk to Muren and you'll understand what ILM is all about; taking on new challenges. By 1989, Muren decided he had pushed the old technology as far as it would go. He saw computer graph(图像)(CG)technology as the wave of the future and took a year off the master it. With CG technology, images can be scanned into a computer for processing, for example, and many separate shots can be combined into a single image. CG technology has now reached the point, Muren says, where special effects can be used to do just about anything so that movies can tell stories better than ever before. The huge success of Jurassic Park and its sequel (续集), The Lost World, the stars of which were computer-generated dinosaurs, suggests that this may very well be true.

单选题Recent discoveries in Montana indicate that some dinosaurs may have {{U}}resided{{/U}} in colonies.

单选题Microsoft Launches Free Security Microsoft has released its free computer security package to the public. From 29 September, Windows users will be able to download the software from Microsoft's Security Essentials website. The free software gives basic protection against viruses, trojans, rootkits, and spyware. The Essentials software is Microsoft's second try at making an own-brand security package. Prior to release a beta version of Security Essentials software, code named Morro, has been available to users in the US, China, Brazil, and Israel. Microsoft said the software would be available to anyone who wanted to use it and downloading it would not involve registering with the software firm or having a limit on the amount of time it could be used for. "Consumers have told us that they want the protection of real-time security software, but that they are confused by trials and renewals and concerned about performance and as a result, too many are unprotected" said Amy Barzdukas, general manager for consumer security at Microsoft in a statement. The only restriction on use is that it has to be installed on a" genuine" Windows PC—One whose copy of its operating system has been verified by Microsoft. In the free software market Microsoft faces competition from many others including AVG. Alwil Avast, Avira Antivir and Comodo. The free software runs on Windows XP, Vista and will also be available for Windows 7 when it is released in late October. Updates will be provided automatically to those who install the software. Prior to working on Security Essentials, Microsoft offered its Windows Live One Care paid security software but this failed to win a significant user base in the highly competitive consumer market. This software was withdrawn in mid. 2009.

单选题After an exchange of gunfire, the terrorist group {{U}}surrendered{{/U}} at last.

单选题Water Resource Humanity uses a little less than half the water available worldwide. Yet occurrences of shortages and droughts (干旱) are causing famine and distress in some areas, and industrial and agricultural by-products are polluting water supplies. Since the worlds population is expected to double in the next 50 years, many experts think we are on the edge of a widespread water crisis. But that doesn"t have to be the outcome. Water shortages do not have to trouble the world—if we start valuing water more than we have in the past. Just as we began to appreciate petroleum more after the 1970s oil crises, today we must start looking at water from a fresh economic perspective. We can no longer afford to consider water a virtually free resource of which we can use as much as we like in any way we want. Instead, for all uses except the domestic demand of the poor, governments should price water to reflect its actual value. This means charging a fee for the water itself as well as for the supply costs. Governments should also protect this resource by providing water in more economically and environmentally sound ways. For example, often the cheapest way to provide irrigation (灌溉) water in the dry tropics is through small-scale projects, such as gathering rainfall in depressions (凹地) and pumping it to nearby cropland. No matter what steps governments take to provide water more efficiently, they must change their institutional and legal approaches to water use. Rather than spread control among hundreds or even thousands of local, regional, and national agencies that watch various aspects of water use, countries should set up central authorities to coordinate water policy.