单选题There is always excitement at the Olympic Games when an athlete breaks a previous performance.A. beatsB. matchesC. maintainsD. announces

单选题The police believe the motive for the murder was jealousy.A. choiceB. ideaC. decisionD. reason

单选题Image Martian Dust Particles NASA"s Phoenix Mars Lander has taken its first ever picture of a single particle of rusty Martian dust with one of its microscopes. The dust particles of dust were shown at a higher magnification than anything outside of Earth that has been imaged before. The rounded particle measured only about one micrometer, or one millionth of a meter, across. "Taking this image required the highest resolution microscope operated off Earth and a specially designed device to hold the Martian dust," said Tom Pike, a Phoenix science team member from Imperial College London. "We always knew it was going to be technically very challenging to image particles this small." The device that imaged the dust speck is called an atomic force microscope, which maps the shape of particles in three dimensions by scanning them with a sharp tip at the end of a spring. The atomic force microscope can detail the shapes of particles as small as about 100 nanometers. And this won"t be the last dust particle that Phoenix will image. "After this first success, we"re now working on building up a portrait gallery of the dust on Mars," Pike said. Dust exists everywhere on Mars, coating the surface and giving it its rusty red color. Dust particles also color the Martian sky pink and feed storms that regularly envelope the planet. The ultrafine dust is the medium that actively links gases in the Martian atmosphere to processes in Martian soil, so it is critically important to understanding Mars" environment, the researchers said. The $ 420-million Phoenix mission is analyzing the dust and subsurface ice layers of Mars" arctic regions to look for signs of potential past habitability. The particle seen in the atomic force microscope image was part of a sample scooped by the robotic arm from the "Snow White" trench and delivered to Phoenix"s microscope station in early July.

单选题Honesty is the best policy, as the English saying goes. Unfortunately, honesty often deserts us when nobody is watching, British psychologists reported last week. Researchers at UK's Newcastle University set up an experiment in their psychology department's coffee room. They set a kettle, with tea, coffee and milk on the counter and hung up a sign listing the price for drinks. People helping themselves to a cup of tea or coffee were supposed to put a few cents into a box nearby. The scientists hung a poster above the money box and alternated each week between images of gazing eyes and pictures of flowers. The researchers found that staff paid 2.76 times more for their drinks when the image of the eyes was hung. "Frankly we were shocked by the size of the effect," said Gilbert Roberts, one of the researchers. Eyes are known to be a powerful perceptual signal for humans, scientists say. "Even though the eyes were not real, they still seemed to make people behave more honestly," said the leader of the study. Researchers believe the effect throws light on our evolutionary past. It may arise from behavioral traits that developed when early humans formed social groups to strengthen their chances of survival. For social groups to work, individuals had to cooperate, rather than act selfishly. "There's an argument that if nobody is watching us, it is in our interests to behave selfishly. But when we are being watched we should behave better. So people see us as co-operative and behave the same way towards us," one scientist said. The new finding indicates that people have striking response to eyes. That might be because eyes and faces send a strong biological signal we have evolved to respond to. The finding can be put to practical use. For example, images of eyes could boost ticket sales on public transport and improve surveillance systems to prevent antisocial behavior. The main idea of the passage is thatA. humans have a stronger response to eyes than to flowers.B. photos of human eyes have a positive effect on people's behavior.C. the scientists' new finding may have many practical uses.D. people may behave dishonestly when there's no one aroun

单选题Please do not hesitate to call me if I can be of further assistance.

单选题The writer's advice about alcohol before you make a speech is to take one or two drinks so as to give yourself some confidence.

单选题第二篇 Driven to Distraction Joe Coyne slides into the driver"s seat, starts up the car and heads to town. The empty stretch of interstate gives way to urban congestion, and Coyne hits the brakes as a pedestrian suddenly crosses the street in front of him. But even if he hadn"t stopped in time, the woman would have been safe. She isn"t real. Neither is the town. And Coyne isn"t really driving. Coyne is demonstrating a computerized driving simulator that is helping researchers at Old Dominion University (ODU) examine how in vehicle guidance systems affect the person behind the wheel. The researchers want to know if such systems, which give audible or written directions, are too distracting—or whether any distractions are offset by the benefits drivers get from having help finding their way in unfamiliar locations. "We are looking at the performance and mental workload of drivers," said Cary Baldwin, the assistant psychology professor leading the research, which involves measuring drivers" reaction time and brain activity as they respond to auditory and visual cues. The researchers just completed a study of the mental workload involved in driving through different kinds of environments and heavy, light traffic. Preliminary results show that as people "get into more challenging driving situations, they don"t have any extra mental energy to respond to something else in the environment." Baldwin said. But the tradeoffs could be worth it, she said. The next step is to test different ways of giving drivers navigational information and how those methods change the drivers" mental workload. "Is it best if they see a picture.., that shows their position, a map kind of display?" Baldwin said. "Is it best if they hear it?" Navigational systems now on the market give point by point directions that follow a prescribed route. "They"re very unforgiving" Baldwin said. "If you miss a turn, they can almost seem to get angry." That style of directions also can be frustrating for people who prefer more general instructions. But such broad directions can confuse drivers who prefer route directions. Baldwin said. Perhaps manufacturers should allow drivers to choose the style of directions they want, or modify systems to present some information in a way that makes sense for people who prefer the survey style, she said. Interestingly, other research has shown that about 60 percent of men prefer the survey style, while 60 percent women prefer the route style, Baldwin said. This explains the classic little thing of why men don"t like to stop and ask for directions and women do, Baldwin added.

单选题His speech was a powerful spur to action.

单选题It is Unormal/U for a teacher to get angry with the student who repeats the same mistake.

单选题The photographs Uevoked/U memories of our

单选题Exposure to the Sun can accelerate the ageing process.

单选题She showed a natural {{U}}aptitude{{/U}} for the work.

单选题A will is a document written to ensure that the wishes of the deceased (已故的) are Urealized/U.

单选题Budget A budget is a spending plan. It can help you spend money wisely. It can do this by cutting out wasteful spending. Of course, preparing a budget takes planning, and following a budget takes will power. Your budget should meet your family's needs and income. The first step in creating a budget is to set your goals. What does your family need and wants. You must know this to work out the details of the budget. Keep goals realistic, in terms of income available. Then decide which goals are the most important. The next step is estimating family income. Before you can plan wisely, you need to know how much money you have to spend! Write down all the money you expect to receive (wages, savings, interest, etc.) during the planned budget period. After you have calculated how much money will be available, it is time to estimate expenses. List all of your family expenses. If you are not satisfied with what you got for your money, look carefully at your spending. Studying your records will show where overspending has occurred. It will also point out poor buying habits. It is also a good idea to set aside a small amount of money for emergencies. Every family has small emergencies: a blown tire, a broken device, or the need for minor medical care.

单选题The government launched a massive campaign against crimes in the big cities.A. proposedB. decidedC. beganD. studied

单选题Knowing that I had been out of work now, they were unwilling to lend me money.

单选题Jack is a diligent worker.A. ambitiousB. lazyC. hardworkingD. clever

单选题下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文中没有提及，请选择C。 Biodiesel Yuthachai of Thailand has invented a home-grown alternative to expensive imported diesel, a biodiesel derived from vegetable oil. Biodiesel is winning political backing in Thailand because it uses coconut and palm oil, both of which are in price slumps, and it limits the reliance on overseas petroleum source, which have become increasingly expensive. Yuthachai, 56, has patented his coconut-oil fuel-making process. He developed his biodiesel 18 years ago, using knowledge he gained from working on a plantation and fixing farm machinery. He now sells his fuel at service stations, but refuses to sell his patent, despite attractive offers from overseas oil firms. He is determined to retain control of his formula and keep it accessible to farmers, so they can make their own fuel. There are several formulations of biodiesel, but Yuthachai's is one of the most basic, using 20 parts crude coconut oil to one part kerosene. It requires only simple, affordable technology to make and works in unmodified, slow-running engines. Despite the public interest in biodiesel, the government has been cautious about Yuthachai's fuel. Since there is currently no regulatory system for vegetable-oil fuels, Yuthachai's fuel cannot be used in regular vehicles. But farmers and ferry operators are more enthusiastic, buying 700,000 liters a day of biodiesel made from crude vegetable oils to run farm machines and boats. Demand is growing: A liter of biodiesel is 4—6 US cents cheaper than diesel. According to some scientists, the biodiesel produced from crude coconut oil may not run through engines as easily as diesel, and fatty-acid deposits can damage engines in the long run. A solution may soon come from using waste cooking oil. An experimental biodiesel plant to refine the waste oil is being built in Thailand. The plant will show the biodiesel-making potential of 60,000 tonnes of waste cooking oil that Bangkok generates daily. Other Asian countries have been researching biodiesel—Malaysia, and the Philippines for 20 years—but Thailand is the first country to have public policy supporting its commercialization. That trend looks like continuing, with the government in talks with a U. S. company to build a more advanced plant in Thailand. Until that's working, homegrown biodiesels will help boost the fortunes of struggling Thais.

单选题Our plan is to allocate one member of staff to handle appointments.

单选题A major cause of the increase in the greenhouse gases is