单选题Would you mind {{U}}keeping an eye on{{/U}} our house for us while we're away?

单选题It is Uabsurd/U to predict that the sun will not rise tomorrow.

单选题Sophonisba P. Breckinridge, the first woman admitted to the bar in Kentucky,eventually abandoned her legal career and became a social worker.

单选题 {{B}}Languages which to be extinct{{/B}} Ever hear someone speak Udihe, Eyak or Arikapu? Odds are you never will. Among the world's 6,800 languages, half to 90 percent could be extinct by the end of the century. One reason is that half of all languages are spoken by fewer than 2,500 people each, according to the Worldwatch Institute, a private organization that monitors global trends. Languages need at least 100,000 speakers to pass from generation to generation, says UNESCO. War and genocide, fatal natural disasters, the adoption of more dominant languages such as Chinese and Russian, and government bans on language also contribute to their extinction. The outlook for Udihe, Eyak and Arikapu, spoken in Siberia, Alaska and the Amazon jungle, respectively, is particularly depressing. About lif0 people speak Udihe, six speak Arikapu, and Eyak is down to one, Worldwatch says. Marie Smith, 83, of Alaska, says she's the last speaker of Eyak, a claim verified by linguists. "It's horrible to be alone," Smith said. It's becoming a struggle, too, to find many who can say "thank you" in the Navajo language of the American Indian tribe (ahehee), or "hello" in the Maori language of New Zealand(kiaora). The losses ripple foar beyond the affected communities. When a language dies, inguists, anthropologists and others lose rich sources of material for their work documenting a people's history, finding out what they knew and tracking their movements from region to region. And the world, linguistically speaking, becomes less diverse. Eight countries account for more than half of all languages. They are, in order, Papua New Guinea, Indonesia, Nigeria, India, Mexico, Cameroon, Australia and Brazil. That languages die isn't new; thousands are believed to have disappeared already. The distinguishing thing is it's happening at such an alarming rate right now. Linguists believe 3,400 to 6,120 Languages could become extinct by 2100. While a few languages including Chinese, Greek and Hebrew, are more than 2,00 years old, others are coming back from the dead, so to speak. In 1983, Hawaiians created the Aha Punana Leo organization to reintroduce their native language throughout the state, including its public schools. The language nearly became extinct when the United States banned schools from teaching in Hawaiian after incorporating the then independent country in 1898. Some 7,000 to 10,000 Hawaiians currently speak their native tongue, up from fewer than 1,000 in 1983, said Luahiwa Namahoe, the organization's spokeswoman.

单选题All of the tenants in the building complained about the lack of hot water.

单选题The president proposed that we should bring the meeting to a close.A. statedB. saidC. suggestedD. announced

单选题Career With a Uniform Want to be the next Xu Sanduo? The TV drama Soldiers' Sortie (Shibing Tuji) might have caused millions of young people to dream idly of putting on an army uniform and going off to boot camp. In fact, a large number of students graduating might consider doing just that. Last month, the People's Liberation Army (PLA) announced that there will be 120,000 job openings this year for college grads. So, one out of every 50 grads has a chance if he or she would like to march down to the local recruiting office. Anyone enlisting will get preferential treatment in tuition compensation and in job opportunities. This decision comes against a backdrop of bad employment news and a cooling economy. This year's recruitment quota outnumbers last year's 39,000 by about three-fold. "It's important to pull in fresh, talented people who can deal with the new equipment and a high-tech military to modernize the nation's defense," said Bai Zixing, a senior officer in the PLA General Staff Department4. The age limit for college recruits has been raised to 24, and there's one more important policy change: Grads who have already volunteered to sign up can quit if they change their minds after finding another job before November, the deadline for enlistment. This gives grads an extra choice in starting a career. The following is a list of preferential things that college grads qualify for if they join the army: A one-time recruitment payment of up to 24,000 yuan, to cover four years of college tuition and loans (this has to be returned if the person is forced to leave the army before completing the service contract). Priority in promotions and in getting admitted to military academies. Anyone with a bachelor's degree or above and a good performance record can be promoted to the rank of officer directly, if they meet certain other criteria. An ordinary soldier may need a couple of years longer to get there. Anyone with a junior college5 degree can go on for a bachelor's degree without having to take the entrance exams. Anyone wanting to take the grad school entrance exam after completing their service can add 10 points to the exam results. Anyone getting a merit citation second class can enter grad school without taking the exam after completion of the service obligation. There are no restrictions on things like going abroad after the service period, unless one deals with confidential work in the army.

单选题Thank you for applying for a position with our firm. We do not have any openings at this time, but we shall keep your application on archive for two months.

单选题The President made a Ubrief/U visit to Beijing.

单选题We found （shelter） from the rain under the tree.

单选题American public education has changed numbers of American parents and teachers are in recent years. One change is that increasing starting independent public schools (51) charter schools (特许学校). In 1991, there were no charter schools in the United States. Today, more than 2,300 charter schools (52) in 34 states and the District of Columbia. 575,000 students (53) these schools. The students are from 5 years of age through 18 or older. A charter school is (54) by groups of parents, teachers and community (社区) members. It is similar in some ways (55) a traditional public school. It receives tax money to operate just as other public schools do. The (56) it receives depends on the number of students. The charter school must prove to local or state governments that its students are learning. These governments (57) the school with the agreement, or charter that permits it to operate. Unlike a traditional public school, (58) , the charter school does not have to obey most laws governing public schools. Local, state or federal governments cannot tell it what (59) . Each school can choose its own goals and decide the ways it wants to (60) those goals. Class sizes usually are, smaller than in many traditional public schools. Many students and parents say (61) in charter schools can be more creative. However, state education agencies, local education-governing committees and unions often (62) charter schools. They say these schools may receive money badly (63) by traditional public schools. Experts say some charter schools are doing well while others are struggling. Congress provided 200 million dollars for (64) charter schools in the 2002 federal budget (预算). But, often the schools say they lack enough money for their (65) . Many also lack needed space.

单选题With {{U}}immense{{/U}} relief I stopped running

单选题Who won the gold medal in the pairs figure-skating event?

单选题For young children getting dresses is a {{U}}complicated{{/U}} business. A. personal B. strange C. funny D. complex

单选题We have got to abide by the rules.

单选题Less Is More It sounds all wrong-drilling holes in a piece of wood to make it more resistant to knocks. But it works because the energy from the blow gets distributed throughout the wood rather than focusing on one weak spot. The discovery should lead to more effective and lighter packaging materials. Carpenters have known (1) centuries that some woods are tougher than others. Hickory (山核桃木), for example, was turned into axe handles and cartwheel spokes (轮辐) because it can absorb shocks without breaking. White oak, for example, is much more easily damaged, (2) it is almost as dense. Julian Vincent at Bathe University and his team were convinced the wood's internal structure could explain the differences. Many trees have tubular (管的) vessels that run (3) the trunk and carry water to the leaves. In oak they are large, and arranged in narrow bands, but in hickory they are smaller, and more evenly distributed. The researchers (4) this layout might distribute a blow's energy throughout the wood, soaking up a bigger hit. To test the idea, they drilled holes 0.65 millimetres across into a block of spruce (云杉), a wood with (5) vessels, and found that (6) with stood a harder knock. (7) when there were more than about 30 holes per square centimetre did the wood's performance drop off. A uniform substance doesn't cope well with knocks because only a small proportion of the material is actually (8) . All the energy from the blow goes towards breaking the material in one or two places, but often the pieces left (9) are pristine (未经破坏的). But instead of the energy being concentrated in one place, the holes provide many weak spots that all absorb energy as they break, says Vincent. "You are controlling the places (10) the wood breaks, and it can then absorb more (11) , more safely. " The researchers believe the principle could be applied to any material- (12) example, to manufacture lighter and more protective packaging. It could (13) be used in car bumpers, crash barriers and arm our for military vehicles, says Ulrike Wegst, (14) the Max Plank Institute for Mental Research in Stuttgart. But she emphasizes that you (15) to design the substance with the direction of force in mind. "The direction of loading is crucial," she says.

单选题The policemen acted quickly because lives were at stake .

单选题Flying the Hypert Skies A little airplane has given new meaning to the term "going hyper." The Hyper-X recently broke the record for air-breathing jet planes when it traveled at a hypersonic speed of seven times the speed of sound. That's about 5,000 miles per hour. At this speed, you'd get around the world -- flying along the equator -- in less than 5 hours. The Hyper-X is an unmanned, experimental aircraft just 12 feet long. It achieves hypersonic speed using a special sort of engine known as a scramjet. It may sound like something from a comic book, but engineers have been experimenting with scramjets since the 1960s. For an engine to burn fuel and produce energy, it needs oxygen. A jet engine, like those on passenger airplanes, gets oxygen from the air. A rocket engine typically goes faster but has to carry its own supply of oxygen. A scramjet engine goes as fast as a rocket, but it doesn't have to carry its own oxygen supply. A scramjet's special design allows it to obtain oxygen from the air that flows through the engine. And it does so without letting the fast-moving air put out the combustion flames. However, a scramjet engine works properly only at speeds greater than five times the speed of sound. A booster rocket carried the Hyper-X to an altitude of about 100,000 feet for its test flight. The aircraft's record-beating flight lasted just 11 seconds. Although the little plane's self-powered flight lasted only 11 seconds, that brief journey on March 27 makes a major milestone on the way to a new breed of very fast airplanes, comments Werner J. A. Dahm of the University of Michigan in Ann Arbor. In the future, engineers predict, airplanes equipped with scramjet engines could transport cargo quickly and cheaply to the brink of space. Such hypersonic jets could potentially carry passengers anywhere in the world in just a few hours. Out of the three experimental Hyper-X aircrafts built for NASA, only one is now left. The agency has plans for another 11-second hypersonic flight, this time at 10 times the speed of the sound.

单选题The frame needs to be strong enough to support the engine.

单选题The dentist has decided to extract her bad tooth. A. pull out B. repair C. take D. dig