单选题Why does Denny have to go unarmed?

单选题There are fierce competitions among the airlines.A. intenseB. strainedC. eagerD. critical

单选题During his lifetime he was able to {{U}}accumulate{{/U}} quite a fortune.

单选题Sleep stairs can present a particular {{U}}hazard{{/U}} to older people. A. picture B. danger C. evidence D. case

单选题Winston became quite {{U}}avaricious{{/U}} in his late life.

单选题It took us a long time to mend the house.A. buildB. destroyC. designD. repair

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：如果该句提的是正确信息，请选择A：如果该句提的是错误信息，请选择B：如果该句的信息文中没有提及，请选择C。 Sonic Device The other day, Dr. Robert Smith, who is blind, took a remarkable stroll through the campus of the University of California at Santa Barbara. As Dr. Smith walked along the campus, places and impediments (障碍物) in his path seemed to call out their names to him -- "library here, library here", "bench here, bench here". Dr. Smith was testing a prototype (样机) navigation system for the blind that anounced the surrounding objects through stereo headphones that were mounted to a computer in his back-pack, creating a virtual reality landscape(仿真影像). The information came not from some miniature radar but from the signals broadcast by the military's network of gloal positioning satellites(全球定位卫星). One day, its developers hope, miniaturized(小型化的) versions of this navigation devices, which now weighs twenty-eight pounds, will help the blind navigate unfamiliar neighborhoods. "With this system you do not need to know a thing in advance about where you are going", said Dr. Roberta Klatzky, a psychologist at Carnegie-Mellon University who is working with Dr. Smith to develop the navigating device. Dr. Michael Oberdor of the National Eye Institute said, "A blind person could walk clown the street and know not just he was at 80th and Broadway, but what stores are around, and that Zabar's delicatessen(熟食店) was up ahead. This navigation system tells you not just where there are obstacles, but your overall location geographically. " It lets blind users construct a mental map of new surroundings and learn their way around. The navigation system uses signals from a computerized map to create a "virtual acoustic display(仿真声音显示). This is a talking map in which large objects seem to announce themselves in the headphones with the precise timing and loudness that would be the case if the objects were actually making a sound. This allows the blind person to sense immediately his or her distance or direction, and use that information for guidance. While no one knows whether it is because blind people tend to develop a sharper sense of hearing, those who have tried the system say that they quickly adapt to locating an object through the sounds. "One of the crucial features of this system is that it takes advantage of sensory paychophysics (感官心理物理学) -- how the brain interprets signals from outside to make a map of your surroundings so you can navigate, " Dr. Oberdor said.

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。 Computer Mouse The basic computer mouse is an amazingly clever invention with a relatively simple design that allows us to point at things on the computer and it is very productive. Think of all the things you can do with a mouse like selecting text for copying and pasting, drawing, and even scrolling on the page with the newer mice with the wheel. Most of us use the computer mouse daily without stopping to think how it works until it gets dirty and we have to learn how to clean it. We learn to point at thing before we learn to speak, so the mouse is a very natural pointing device. Other computer pointing devices include light pens, graphics tablets and touch screen, but the mouse is still our workhorse. The computer mouse was invented in 1964 by Douglas Englehart of Stanford University. As computer screens became popular and arrow keys were used to more around a body of text, it became clear that a pointing device that allowed easier motion through the text and even selection of text would be very useful. The introduction of the mouse, with the Apple Lisa computer in 1983, really started the computer public on the road to relying on the mouse for routine computer tasks. How does the mouse work? We have to start at the bottom, so think upside down for now. It all starts with mouse ball. As the mouse ball in the bottom of the mouse rolls over the mouse pad, it presses against and turns two shafts. The shafts are connected to wheels with several small holes in them. The wheels have a pair of small electronic light-emitting devices called light emitting diodes (LED) mounted on either side. One LED sends a light beam to the LED on the other side. As the wheels spin and a hole rotates by, the light beam gets through to the LED on the other side. But a moment later the light beam is blocked until the next hole is in place. The LED detects a changing pattern of light, converts the pattern into an electronic signal, and sends the signal to the computer through wires in a cable that goes out the mouse body. This cable is the tail that helps give the mouse its name. The computer interprets the signal to tell it where to position the cursor on the computer screen. So far we have only discussed the basic computer mouse that most of you probably have or have used. One problem with this design is that the mouse gets dirty as the ball rolls over the surface and picks up the dirt. Eventually you have to clean your mouse. The newer optical mice avoid this problem by having no moving parts.

单选题She will be very {{U}}pleased{{/U}} to meet you. A. angry B. happy C. sad D. unwilling

单选题Robots May Allow Surgery in Space Small robots designed by University of Nebraska researchers may allow doctors on Earth to help perform surgery on patients in space. The tiny, wheeled robots, 1 are about 3 inches tall and as wide as a lipstick case, can be slipped into small incisions (切口) and computer-controlled by surgeons in different locations. Some robots are equipped 2 cameras and lights and can send images back to surgeons and others, to which surgical tools are attached, can be 3 remotely. "We think this is going to 4 open surgery," Dr. Dmitry Oleynikov said at a news conference. Oleynikov is a 5 in computer-assisted surgery at the University of Nebraska Medical Center in Omaha. Officials hope that NASA will teach 6 to use the robots soon enough so that surgeries could one day be performed in space. On earth, the surgeons could control the robots themselves 7 other locations. For example, the robots could enable surgeons in other places to 8 on injured soldiers on the front line. Researchers plan to seek federal regulatory 9 early next year. Tests on animals have been successful, and tests on humans in England will begin very soon. The camera-carrying robots can provide 10 of affected areas and the ones with surgical tools will be able to maneuver (操控) inside the body in ways surgeons" hands can"t. The views from the camera-carrying robots are 11 than the naked eye, because they 12 back color images that are magnified (放大). Because several robots can be inserted through one incision, they could reduce the amount and 13 of cuts needed for surgery, which would decrease recovery time. This is particularly 14 to those patients who have been debilitated (使虚弱) by long illness. Eventually, Oleynikov said that the tiny robots may enable surgeons to work without ever 15 their hands in patients" bodies. "That"s the goal," Oleynikov said. "It"s getting easier and easier. We can do even more with these devices."

单选题In Western Europe or the US, you only have to turn on the tap and you'll see a jet of cold water, ready to drink, cook and bathe in. or wash the car. Turn on the tap in Karachi and you'll be lucky to fill a few buckets. Until 1947, the city was part of British India, whose engineers built and maintained a modest water supply network for the city's 500,000 inhabitants. Today, Karachi is home to around 12 million people. Half of them live in slum townships ,with little or no water through the mains. Even the" rich" half usually have to wait days before anything trickles through their pipes. And the coloured liquid that finally emerges is usually too contaminated to drink, There are about ______ people living in Karachi slum townships.A. 500,000B. 12,000,000C. 250,000D. 6,000,000

单选题The local government decided to {{U}}merge{{/U}} the two firms into a big one. A.motivate B.combine C.compact D.nominate

单选题She always {{U}}finds fault with{{/U}} everything. A. criticizes B. simplifies C. evaluates D. examines

单选题The land crab a forest-floor scavenger native to tropical America, migrates to the water to Ubreed/U.

单选题Both main parties are Ubacking/U these proposals.

单选题The kind of thing that happened last Saturday night is a regular occurrence in the village. A. event B. presence C. development D. endeavour

单选题The exploits of the legendary miner, John Henry, have come to symbolize the manual laborer’s {{U}}stand against{{/U}} mechanization.

单选题阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 Plants still give us our oxygen. If every plant{{U}} (51) {{/U}}, you'll die too. Without plants, you can' t breathe. But you also need energy. You need it to breathe and to move. In fact, you need {{U}} (52) {{/U}}to live. Some of the first living things couldn't{{U}} (53) {{/U}}their own energy. They needed the energy of sunlight, but they couldn't make it themselves.{{U}} (54) {{/U}}could they get it? There was only one answer at the{{U}} (55) {{/U}}. That is still true today. Animals still have to get their energy from. plants. Plants keep you{{U}} (56) {{/U}}. Sometimes we eat the plants{{U}} (57) {{/U}}. But sometimes an animal eats the plants (58) , then we eat the animal. Apples and oranges grow on trees—plants. Bread comes from plants in a{{U}} (59) {{/U}}. We get eggs from birds, but the birds eat plants. (Or they eat insects, and the insects have eaten plants. ) We can eat{{U}} (60) {{/U}}from a deer, but the deer has eaten plants. We eat{{U}} (61) {{/U}}, and the fish has already eaten plants. (Or it ate other fish—and they ate plants. ) We don' t eat{{U}} (62) {{/U}}, but we drink milk. And the cow has eaten the grass for us. Every part of your food comes from plants. When you eat part of an animal, ask yourself, what did this animal eat? If it ate other animals, ask yourself, what did they eat? You will always{{U}} (63) {{/U}}a plant. So what is really keeping you alive? The green plants of the world are catching sunlight for you. You are using the energy from our own{{U}} (64) {{/U}}. You are{{U}} (65) {{/U}}the sun.

单选题Laura was absolutely Uconfused/U by the puzzle.

单选题We must abide by the rules.