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.

单选题Data from Voyager Ⅱ have presented astronomers with a {{U}}puzzle{{/U}} about why our outermost planet exists. A. problem B. mystery C. question D. point

单选题The Smog (烟雾) For over a month, Indonesia was in crisis. Forest fires raged out of control as the country suffered its worst drought for 50 years. Smoke from the fires mixed with sunlight and hot dry air to form a cloud of smog. This pollution quickly spread and within days it was hanging over neighbouring countries including Malaysia, Singapore and Thailand. When the smoke combined with pollution from factories and cars, it soon became poisonous (有毒的). Dangerous amounts of CO became trapped under the smog and pollution levels rose. People wheezed (喘息) and coughed as they left the house and their eyes watered immediately. The smog made it impossible to see across streets and whole cities disappeared as grey soot (烟灰) covered everything. In some areas, water was hosed (用胶管浇) from high-rise city buildings to try and break up the smog. Finally, heavy rains, which came in November, put out the fires and cleared the air. But the environmental costs and health problems will remain. Many people from South- Eastern Asian cities already suffer from breathing huge amounts of car exhaust fumes (汽车排放的废气) and factory pollution. Breathing problems could well increase and many non- sufferers may have difficulties for the first time. Wildlife has suffered too. In lowland forests, elephants, deer, and tigers have been driven out of their homes by smog. But smog is not just an Asian problem. In fact, the word was first used in London in 1905 to describe the mixture of smoke and thick fog. Fog often hung over the capital. Sometimes the smog was so thick and poisonous that people were killed by breathing problems or in accidents. About 4,000 Londoners died within five days as a result of thick smog in 1952.

单选题They Say Ireland's the Best Ireland is the best place in the world to live in for 2005, according to a life quality ranking that appeared in Britain's Economist magazine last week. The ambitious attempt to compare happiness levels around the world is based on the principle that wealth is not the only measure of human satisfaction and well-being. The index of 111 countries uses data on incomes, health, unemployment, climate, political stability, job security, gender equality as well as what the magazine calls "freedom, family and community life". Despite the bad weather, troubled health service, traffic congestion (拥挤) , gender inequality and the high cost of living. Ireland scored an impressive 8.33 points out of 10. That put it well ahead of second-place Switzerland, which managed 8.07. Zimbabwe, troubled by political insecurity and hunger, is rated the gloomiest (最差的), picking up only 3.89 points. "Although rising incomes and increased individual choices are highly valued." the report said, "some of the factors associated with modernization such as the breakdown (崩溃) in traditional institutions and family values in part take away from a positive impact." "Ireland wins because it successfully combines the most desirable elements of the new with the preservation of certain warm elements of the old, such as stable family and community life". The magazine admitted measuring quality of life is not a straightforward thing to do, and that its findings would have their critics. No. 2 on the list is Switzerland. The other nations in the top 10 are Norway, Luxembourg, Sweden, Australia, Iceland, Italy, Denmark and Spain. The UK is positioned at No. 29, a much lower position chiefly because of the social and family breakdown recorded in official statistics. The US, which has the second highest per capita GDP (人均国内生产总值) after Luxembourg, took the 13th place in the survey. China was in the lower half of the league at 60th.

单选题He's spent years {{U}}cultivating{{/U}} a knowledge of art. A. sharing B. using C. denying D. developing

单选题Sally likes to tease her brother about his girl friends.

单选题Allthe cars are tested for {{U}}defects{{/U}} before leaving the factory

单选题Which of the following is NOT mentioned in the passage as an instance of attack by a hacker?

单选题My father is a physician .

单选题Many of Edith Wharton"s best stories were completed under great personal strain.

单选题He cannot discriminate between a good idea and a bad one. A．judge B．assess C．distinguish D．recognize

单选题Houses in 18th Century North America Seventeenth-century houses in colonial North America were simple structures that were primarily functional, carrying over traditional designs that went back to the Middle Ages. During the first half of the eighteenth century, however, houses began to show a new elegance. As wealth increased, more and more colonists built fine houses. Since architecture was not yet a specialized profession in the colonies, the design of buildings was left either to amateur designers or to carpenters who undertook to interpret architectural manuals imported from England. Inventories of colonial libraries show an astonishing number of these handbooks for builders, and the houses erected during the eighteenth century show their influence. Nevertheless, most domestic architecture of the first three-quarters of the eighteenth century displays a wide divergence of taste and freedom of application of the rules laid down in these books. Increasing wealth and growing sophistication throughout the colonies resulted in houses of improved design, whether the material was wood, stone or brick. New England still favored wood, though brick houses became common in Boston and towns, where the danger of fire gave an impetus to the use of more durable material. A few houses in New England were built of store, but only in Pennsylvania and adjacent area was stone widely used in dwellings. An increased use of brick in houses and outbuildings is noticeable in Virginia and Maryland, but wood remained the most popular material even in houses built by wealthy landowners. In the Carolinas, even in closely packed Charleston, wooden houses were much more common than brick. Eighteenth-century houses showed great interior improvement over their predecessors. Windows were made larger and shutters removed. Large, clear panes replaced the small leaded glass of the seventeenth century. Doorways were larger and more decorative. Fireplaces became decorative features of rooms. Walls were made of plaster of wood, sometimes elaborately paneled. White paint began to take the place of blues, yellows, greens, and lead colors, which had been popular for walls in the earlier years. After about 1730, advertisements for wallpaper styles in scenic patterns began to appear in colonial newspapers.