单选题Please do not hesitate to call me if I can be of further assistance.A. contactB. seeC. helpD. touch

单选题Only those over 70 are eligible for the special payment.

单选题Mary felt {{U}}lonely{{/U}} after her husband died in a car accident.

单选题Inspecting a Used Car The scariest part of buying a used car is not being completely sure of what condition it's in. A car that's been in a major accident is always a bigger risk, but sellers often try to hide this information. Andrew Bleakley, evaluator-inspector, runs a mobile vehicle inspection service in Montreal. For about $ 80 he will perform a full, unbiased inspection on a used vehicle'. In his 10 years as a professional inspector, Bleakl'ey has seen a lot. He warns. "Watch out for dealer demonstration vehicles which are used, not new. They may have been in a collision." He adds that it is not uncommon in Ontario and Quebec especially for unscrupulous sellers to roll back the odometer or to even disengage it. Bleakiey has special tools to check for this. Bleakley always recommends hiring all independent technician to inspect the condition of a. used car before you buy it. The problem is finding someone qualified to do the inspection. Which he says generally doesn't mean just any mechanic. A thorough mechanical inspection includes checking the compression, all major systems, including the engine, electrical and charging systems, transmission and drive line, fluids, brakes, suspension, and steering. Essential, too, is all inspection of the car's body and finally a road test. There are, however, a few things everyone can do before buying a used car: Do a visual check of the car. Look at the right rear door hinges. If they are very worn, or the door doesn't close well, the car may have been used as a taxi. Holes in the roof could mean the car was used for deliveries. Check for oil leaks on the pavement. Note that leaks are not necessarily a significant problem— it depends on the cause. Don't assume that new looking brake and accelerator pedals mean the car hash't been driven much. Resellers know people check these details and can buy new pads for around $ 6. Copy down the vehicle' identification number (VIN). a 17-character combination of numbers and letters, from the vehicle's dashboard. In Ontado, ask the dealer or seller for the Used Vehicle Information Package. This gives details of previous owners, any outstanding liens on the car, and the fair market value of the vehicle. collision n. 碰撞；碰撞事故 odometer n.里程表 compression n. 压缩；压缩量 pedal n.踏脚 lien n. 扣押权 unscrupulous adj.不择手段的 disengage v. 松开；使脱离 transmission n.传输 suspension n.悬架 hinge n.铰链 dashboard n.仪表板

单选题The cylindrical shape of a cactus reduces moisture loss. A. lessens B. delays C. redistributes D. reverses

单选题You must shine your shoes. A．polish B．clear C．wash D．mend

单选题It"s a gorgeous day anyway.

单选题As in the field of space travel, so in undersea exploration new technologies continue to appear. They share a number of similarities with each other — as well as some important differences. Manned submersibles (潜水器), like spaceships, must maintain living conditions in an unnatural environment. But while a spaceship must simply be sealed against the vacuum of space, a submersible must be able to bear extreme pressure if it is not to break up in deep water. In exploring space, unmanned vehicles were employed before astronauts. In undersea exploration, on the other hand, men paved the way, only recently have unmanned remote-operated vehicles (ROVs) been put to use. One reason for this is that communicating with vehicles in orbit is much easier than talking to these underwater. A vacuum am ideal medium for radio communications, but underwater communications are limited to much slower sound waves. Thus, most undersea vehicles—particularly ROVs— operate at the end of long ropes. For a similar reason, knowing where you are undersea is much more difficult than in space. A spaceship's position can be located by following its radio signal, or by using telescopes and radar. For an undersea vehicle, however, a special network of sonar (声纳) must be laid out in advance on the ocean' floor in the area of a dive to locate the vehicle's position. Though undersea exploration is more challenging than outer space in a number of respects, it has a distinct advantage: Going to the ocean depths doesn't require the power necessary to escape Earth's gravity. Thus, it remains far less expensive.

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，为每题定1个最佳选项。{{B}}第一篇{{/B}} How to Start a Small Business in the US People from other countries often take America as the "land of opportunity". Americans, too, believe that the country gives no end of chances to those who want to open their own businesses. Today, many Americans are still trying hard to become small business people, although only one out of two remains in operation after the first two years. Many people start their small businesses for the wrong reasons. They want to get away from the paper work of their present jobs, or to exchange the responsibility of their present jobs for free life styles. But more, not less, paper work and responsibility come with ownership of a small business. Thomas is the owner of the news magazine Mother Earth, which is now quite successful. He says that he had to work sixty hours without stopping when he was trying to bring out the first issue. Thomas had waited for years after he came up with the idea for Mother Earth. During that time, he collected as much information as he could about his business. He borrowed books from the library, talked to successful people in the field, and began planning carefully the amount of money and the kinds and numbers of supplies he would need. When he finally opened with a capital of $ 1,500 ,he set up his office in the kitchen and his printing press in the garage. Owing to his devotion(投入)to business, his talent, and his skill in management, Mother Earth now has a circulation(发行量) of 300,000. Not all small businesses are doing as fine as Mother Earth as 50% of the 450,000 that start in America every year fail. Still, 95% of businesses in the US can be called "small". Altogether these businesses amount to 40% of America's gross national product(国民生产总值).

单选题The boss is impatient to novices.A. newcomersB. carpentersC. novelistsD. secretaries

单选题It is implied in the passage that the writer takes a(n) ______ attitude towards the mall.

单选题Can Buildings Be Designed to Resist Terrorist Attack? In the aftermath of the terrorist attack on the World Trade Center, structural engineers are trying hard to solve a question that a month ago would have been completely unthinkable: Can buildings be designed to withstand catastrophic blasts (爆炸) inflicted by terrorists? Ten days after the terrorist attacks on the twin towers, structural engineers from the University at Buffalo and the Multidisciplinary Center for Earthquake Engineering Research (MCEER) headquartered (总部在某地) at UB traveled to ground zero as part of a project funded by the National Science Foundation. Visiting the site as part of an MCEER reconnaissance (事先考查) visit, they spent two days beginning the task of formulating ideas about how to design such structures and to search for clues on how to do so in buildings that were damaged but still are standing. "Our objective in visiting ground zero was to go and look at the buildings surrounding the World Trade Center, those buildings that are still standing, but that sustained damage," said M. Bruneau, Ph.D. "Our immediate hope is that we can develop a better understanding as to why those buildings remain standing, while our long-term goal is to see whether earthquake engineering technologies can be married to existing technologies to achieve enhanced performance of buildings in the event of terrorist attacks," he added. Photographs taken by the investigators demonstrate in startling (惊人的) detail the monumental damage inflicted on the World Trade Center towers and buildings in the vicinity. One building a block away from the towers remains standing, but was badly damaged. "This building is many meters away from the World Trade Center and yet we see a column there that used to be part of that building," explained A. Whittaker, Ph. D. "The column became a missile that shot across the road, through the window and through the floor." The visit to the area also revealed some surprises, according to the engineers. For example, the floor framing system in one of the adjacent buildings was quite rugged, allowing floors that were pierced by tons of falling debris to remain intact. "Highly redundant ductile (有延展性的) framing systems may provide a simple, but robust strategy for blast resistance," he added. Other strategies may include providing alternate paths for gravity loads in the event that a load-bearing column fails. "We also need a better understanding of the mechanism of collapse," said A. Whittaker. "We need to find out what causes a building to collapse and how you can predict it." A. Reinhorn, Ph. D. noted that "Earthquake shaking has led to the collapse of many buildings in the past. It induces dynamic response and extremely high stresses and deformations in structural components. Solutions developed for earthquake-resistant design may be directly applicable to blast engineering and terrorist-resistant design. Part of our mission now at UB is to transfer these solutions and to develop new ones where none exist at present."

单选题Unpopular Subjects? Is there a place in today's society for the study of useless subjects in our universities? Just over 100 years ago Fitzgerald argued in a well-written letter (51) Nature that "Universities must be allowed to study useless subjects (52) they don't，who will?He went 0n to use the (53) of Maxwell's electrodynamics_(电动力学)as one case where a"useless subject" has been transformed to a useful subject． 　　Nowadays this argument is again very much (54) in many universities．Indeed one suspects that it is one of those arguments that must be (55) anew(重新)by each generation．But now there is an added twist ~)—subjects must not only be useful，they must also be (56) enough that students will flock(蜂拥)to d0 them，and even flock to pay to do them． 　　As universities become commercial operations，the pressure to (57) subjects or departments that are less popular will become stronger and stronger, Perhaps this is most strongly (58) at the moment by physics．There has been much (59) in the press of universities that are closing down physics departments and incorporate them with mathematics or engineering departments． 　　Many scientists think otherwise．They see physics as a (60) science，which must be kept alive if only to (61) a base for other sciences and engineering．It is of their great personal concern that physics teaching and research is under (62) in many universities．How Can it be preserved in the rush towards commercial competition? A major turnaround(转变)in student popularity may have to (63) until the industrial world discovers that it needs physicists and starts paying them well．Physics is now not only unpopular；it is also"hard"．We can do more about the latter by (64) teaching in our schools and universities．We can also (65) cooperative arrangements to ensure that physicists keep their research and teaching up to date.

单选题The river widens considerably as it begins to turn east. A. extends B. stretches C. broadens D. travels

单选题What Is the Coolest Gas in the Universe? What is the coldest air temperature ever recorded on the Earth? Where was this low temperature recorded? The coldest recorded temperature on Earth was -91℃, which (51) in Antarctica in 1988. We encounter an interesting situation when we discuss temperatures in (52) . Temperatures in Earth orbit actually range from about 20℃ to 120℃. The temperature depends upon (53) you are in direct sunlight or shade. Obviously, -120℃ is colder than our body can safely endure. Thank NASA science for well-designed space (54) that protect astronauts from these temperature extremes. The space temperatures just discussed affect only our area of the solar (55) . Obviously, it is hotter closer to the Sun and colder as we travel away from the Sun. Astronomers estimate temperatures at Pluto are about -210℃. How cold is the lowest estimated temperature in the entire universe? Again, it depends upon your (56) . We are taught it is supposedly (57) to have a temperature below absolute zero, which is -273℃, at which atoms do not move. Two scientists, whose names are Cornell and Wieman, have successfully cooled down a gas to a temperature barely (58) absolute zero. They won a Nobel Prize in Physics in 2001 for their work—not a discovery, in this case. Why is the two scientists work so important to science? In the 1920s, Satyendra Nath Bose was studying an interesting (59) about special light particles we now call photons. Bose had trouble (60) other scientists to believe his theory, (61) he contacted Albert Einstein. Einstein's calculations helped him theorize that atoms (62) behave as Bose thought—but only at very cold temperatures. Scientists have also discovered that (63) atoms can help them make the world's atomic docks even more accurate. These clocks are so accurate today they would only lose one second (64) six million years! Such accuracy will help us travel in space because distance is velocity times time (d=vt). With the long distances involved in space (65) , we need to know time as accurately as possible to get accurate distance.

单选题It is necessary that the membership applications should be Udispatched/U immediately.

单选题A large crowd Uassembled/U outside the American embassy.

单选题A person who deals with the public must be {{U}}courteous{{/U}} at all times, even when he or she is very tired.

单选题The movie has a {{U}}satisfying{{/U}} ending.

单选题The story was touching .