单选题The old concerns lose importance and some of them vanish altogether.

单选题At 80, Peck was still vigorous and living in Paris.A. happyB. aloneC. busyD. energetic

单选题Could you please tell me your standards when selecting a candidate?

单选题A new system of quality control was {{U}}brought{{/U}} in to overcome the defects in the firm's products. A. invested B. introduced C. installed D. insisted

单选题下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。{{B}}第一篇{{/B}} Pool Watch Swimmers can drown in busy swimming pools when lifeguards fail to notice that they are in trouble. The Royal Society for the Prevention of Accidents says that on average 15 people drown in British pools each year, but many more suffer major injury after getting into difficulties. Now a French company has developed an artificial intelligence system called Poseidon that sounds the alarm when it sees someone in danger of drowning. When a swimmer sinks towards the bottom of the pool, the new system sends an alarm signal to a poolside monitoring station and a lifeguard's pager. "In trials at a pool in Ancenis, near Nantes, it saved a life within just a few months, " says Alistair MeQuade, a spokesman for its maker, Poseidon Technologies. Poseidon keeps watch through a network of underwater and overheard video cameras. AI software analyses the images to work out swimmers trajectories(轨道，轨线). To do this reliably, it has to tell the difference between a swimmer and the shadow of someone being cast onto the bottom or side of the pool. "The underwater environment is a very dynamic one, with many shadows and reflections dancing around. " says McQuade. The software does this by "projecting" a shape in its field of view onto an image of the far wall of the pool. It does the same with an image from another camera viewing the shape from a different angle. If the two projections are in the same position, the shape is identified as a shadow and is ignored. But if they are different, the shape is a swimmer and so the system follows its trajectory. To pick out potential drowning victims, anyone in the water who starts to descend slowly is added to the software's "pre-alert" list, says McQuade. Swimmers who then stay immobile on the pool bottom for 5 seconds or more are considered in danger of drowning. Poseidon double-checks that the image really is of a swimmer, not a shadow, by seeing whether it obscures the pool's floor texture when viewed from overhead. If so, it alerts the lifeguard, showing the swimmer's location on a poolside screen. The first full-scale Poseidon system will be officially opened next week at a pool in High Wycombe. Buckinghamshire. One man who is impressed with the idea is Travor Baylis, inventor of the clockwork radio. Baylis runs a company that installs swimming pools -- and he was once an underwater escapologist (表演脱身术的人)with a circus. "I say full marks to them if this works and can save lives, " he says. But he adds that any local authority spending 230,000 -- plus on a Poseidon system ought to be investing similar amounts in teaching children to swim.

单选题I had nothing to say regarding this matter.

单选题A notably short man, he plays basketball with his staff several times a week.

单选题What people often talk is their dream.A. worryB. showC. reduceD. mention

单选题He often finds fault with my work.A. criticizesB. praisesC. evaluatesD. talks about

单选题From my standpoint, this thing is just ridiculous. A．field B．point of view C．knowledge D．information

单选题 The Appearance of Woman Women, as all research suggests, are much more critical of their appearance than men—much less likely to admire what they see in the mirror. Up to 8 out of 10 women are dissatisfied with their reflection, and more than half may see a distorted image. Men looking in the mirror are more likely to be either pleased with what they see or indifferent. Research shows that men generally have a much more positive body image than women—if anything, they may tend to over-estimate their attractiveness. Some men looking in the mirror may literally not see the flaws in their appearance. Why are women so much more self-critical than men? Because women are judged on their appearance more than men, and standards of female beauty are considerably higher and more inflexible. Women are continually bombarded with images of the "ideal" face. And constant exposure to idealized images of female beauty on TV, magazines and billboards makes exceptional good looks seem normal and anything short of perfection seem abnormal and ugly. It has been estimated that young women now see more images of outstandingly beautiful women in one day than our mothers saw throughout their entire adolescence. Also, most women trying to achieve the impossible standards of female beauty have in fact become progressively more unrealistic during the last century. In 1917, the physically perfect woman was about 5 feet 4 inches tall and weighed nearly 10 stone (英石). Even 25 years ago, top models and beauty queens weighed only 8% less than the average women, now they weigh 23% less. The current media ideal for women is achievable by less than 5% of the female population—and that's just in terms of weight and size. If you want the ideal shape, face etc., it's probably more like 1%.

单选题Many forms of cancer can be cured if Udetected /Uearly

单选题The cars are tested for {{U}}defects{{/U}} before leaving the factory. A.functions B.faults C.motions D.parts

单选题What do we learn from the last paragraph?

单选题The train came to an {{U}}abrupt{{/U}} stop, making us wonder where we were.

单选题下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 Crashed Cars to Text Message for Help There is no good place to have a car crash -- but some places are worse than others. In a foreign country, for instance, {{U}}(51) {{/U}} to explain via cellphone that you are upside down in a ditch (沟渠) when you cannot speak the local language can fatally (~) delay the arrival of the emergency services. But an answer may be at hand. Researchers funded by the European Commission are beginning tests of a system called E-merge that {{U}}(62) {{/U}} senses when a ear has crashed and sends a text message, telling emergency services in the local language that the accident has taken place. The system was {{U}}(53) {{/U}} by ERTICO, a transport research organization based in Brussels. Belgium. Cars are fitted with a eellphone-sized device attached {{U}}(54) {{/U}} the underside of the dashboard (仪表板) which is activated by the same sensor that triggers the airbag in a crash. The device {{U}}(55) {{/U}} a cellphone circuit, a GPS positioning unit and a microphone and loudspeaker. It registers the severity of the crash by {{U}}(56) {{/U}} the deceleration data from the airbag's sensor. Using GPS information, it works out which country the Car is in, and from this it determines {{U}}(57) {{/U}} which language to compose an alert message detailing precise location of the accident. The device then automatically makes a call to the local emergency services {{U}}(58) {{/U}}. If the car's occupants are conscious, they can communicate with the operator {{U}}(59) {{/U}} the speaker and microphone. E-merge also transmits the vehicles make, model, color and license number, and its heading' when it crashed, which in rum indicates on which side of a multi-lane highway it ended up. This {{U}}(60) {{/U}} the emergency services find the vehicle as soon as they arrive on the scene. "We can waste a large {{U}}(61) {{/U}} time searching for an incident, "says Jim Hammond, a(an) {{U}}(62) {{/U}} in vehicle technology at the Association of Chief Police Officers in the UK. Tests will begin soon with police car fleets in the UK. Trials have already started in Germany, Sweden, Spain, the Netherlands and Italy. In-car systems that summon (召集) the emergency services after a crash have {{U}}(63) {{/U}} been fitted in some premium cars". ERTICO says that {{U}}(64) {{/U}} EU states "are willing to fund the necessary infrastructure (基础结构), E--merge could be working by 2008. A study by French car maker Renault" concluded that the system could save up to 6000 of the 40,000 lives lost each year on Europe's roads, and prevent a similar number of serious injuries. The Renault study estimates that fitting E-merge to every car in Europe would eventually save around 150 billion per {{U}}(65) {{/U}} in terms of reduced costs to health services and insurance companies, and fewer lost working days.

单选题It's not hard to understand why a big utility might not like the idea of homes, businesses, schools, and even government buildings being covered in solar panels. If every building in America is generating its own solar energy, that throws a big wrench(猛拉) into their business model. It's why utilities have historically been opposed to solar power, say solar's advocates. But as most states have passed renewable-energy standards recently, mandating(命令, 指示) that a certain percentage of their energy come from renewable sources, utilities have become reluctant players in the solar game because, frankly, they have no choice. Rather than get on board with rooftop solar, though, utilities decided to do what they do best: build a centralized system of large power plants, and make money by charging customers for taking power off the grid. While large-scale utility projects do hold the promise of generating massive amounts of electricity, so far they've delivered precious, few new sources of electricity, as dozens of proposed projects are languishing in the application process. Renewable-energy standards in many states require thatA. utilities build a centralized system of large power plants.B. utilities participate in rooftop-solar electricity industry.C. utilities make money by charging customers for taking power off the grid.D. a certain percentage of the utilities' energy come from renewable sources.

单选题Some People Do Not Taste Salt Like Others Low-salt foods may he harder for some people to like than others, according to a study by a Penn State College of Agricultural Sciences food scientist. The research indicates that genetic factors influence some of the difference in the levels of salt we like to eat. Those conclusions are important because recent, well-publicized efforts to reduce the salt content in food have left many people struggling to accept fare that simply does not taste as good to them as it does to others, pointed out John Hayes, assistant professor of food science, who was lead investigator on the study. Diets high in salt can increase the risk of high blood pressure and stroke. That is why public health experts and food companies are working together on ways to help consumers lower salt intake through foods that are enjoyable to eat. This study increases understanding of salt preference and consumption. The research involved 87 carefully screened participants who sampled salty foods such as soup and chips, on multiple occasions, spread out over weeks. Test subjects were 45 men and 42 women, reportedly healthy, ranging in age from 20 to 40 years. The sample was composed of individuals who were not actively modifying their dietary intake and did not smoke cigarettes. They rated the intensity of taste on a commonly used scientific scale, ranging from barely detectable to strongest sensation of any kind. "Most of us like the taste of salt. However, some individuals eat more salt, both because they like the taste of saltiness more, and also because it is needed to block other unpleasant tastes in food," said Hayes. "Supertasters, people who experience tastes more tensely, consume more salt than nontasters do. Snack foods have saltiness as their primary flavor, and at least for these foods, more is better, so the supertasters seem to like them more." "However, supertasters also need higher levels of salt to block unpleasant bitter tastes in foods such as cheese," Hayes noted. "For example, cheese is a wonderful blend of dairy flavors from fermented, milk, but also bitter tastes from ripening that are blocked by salt," he said. "A supertaster finds low-salt cheese unpleasant because the bitterness is too pronounced." Hayes cited research done more than 75 years ago by a chemist named Fox and a geneticist named Blakeslee, showing that individuals differ in their ability to taste certain chemicals. As a result, Hayes explained, we know that a wide range in taste acuity exists, and this variation is as normal as variations in eye and hair color. "Some people, called supertasters, describe bitter compounds as being extremely bitter, while others, called nontasters, find these same bitter compounds to be tasteless or only weary bitter," he said. "Response to bitter compounds is one of many ways to identify biological differences in food preference because supertasting is not limited to bitterness."

单选题You can tell from the yellow Ustreaks/U on the leaves that the plant has been infected.

单选题It was a fascinating painting, with clever use of color and light.