单选题Preserve the Environment Throughout history man has changed his physical environment in order to improve his way of life. With the tools of technology he has altered many physical features of the earth. He has transformed woodlands into farmland, and made lakes and reservoirs out of rivers for irrigation purposes or hydroelectric power. Man has also modified the face of the earth by draining marshes and cutting through mountains to build roads and railways. However, man"s changes to the physical environment have not always had beneficial results. Today, pollution of the air and water is an increasing danger to the health of the planet. Each day thousands of tons of gases come out of the exhausts of motor vehicles; smoke from factories pollutes the air of industrialized areas and the surrounding areas of countryside. The air in cities is becoming increasingly unhealthy. The pollution of water is equally harmful. In the sea, pollution from oil is increasing and is killing enormous numbers of algae (水藻), fish and birds. The whole ecological balance of the sea is being changed. The same problem exists in rivers. Industrial wastes have already made many rivers lifeless. Conservationists believe that it is now necessary for man to limit the growth of technology in order to survive on earth.

单选题The National Trust The National Trust in Britain plays an increasingly important part in the preservation for public enjoyment of the best that is left unspoiled of the British countryside. Although the Trust has received practical and moral support from the Government, it is not a rich Government department. It is a voluntary association of people who care for the unspoiled countryside and historic buildings of Britain. It is charity which depends for its existence on voluntary support from members of the public. Its primary duty is to protect places of great natural beauty and places of historical interest. The attention of the public was first drawn to the dangers threatening the great old houses and castles of Britain by the death of Lord Lothian, who left his great seventeenth-century house to the Trust together with the 4,500-acre park and estate surrounding it. This gift attracted wide publicity and started the Trust"s "Country House Scheme". Under this scheme, with the help of the Government and the general public, the Trust has been able to save and make accessible to the public about one hundred and fifty of these old houses. Last year about one and three quarters of a million people paid to visit these historic houses, usually at a very small charge. In addition to country houses and open spaces the Trust now owns some examples of ancient wind and water mills, nature reserves, five hundred and forty farms and nearly two thousand five hundred cottages or small village houses, as well as some complete villages. In these villages no one is allowed to build, develop or disturb the old village environment in any way and all the houses are maintained in their original sixteenth-century style. Over four hundred thousand acres of coastline, woodland, and hill country are protected by the Trust and no development or disturbances of any kind are permitted. The public has free access to these areas and is only asked to respect the peace, beauty and wildlife. So it is that over the past eighty years the Trust has become a big and important organization and an essential and respected part of national life, preserving all that is of great natural beauty and of historical significance not only for future generations of Britons but also for the millions of tourists who each year invade Britain in search of a great historic and cultural heritage.

单选题He achieved success through hard work.A. reachedB. reapedC. attainedD. took

单选题To cool itself, a rhinoceros soaks in mud or water because its thick {{U}}hide{{/U}} has no sweat glands.

单选题He was kept in appalling conditions in prison.

单选题If you want my advice, you should Urevise/U your plan for the trip to Beijing.

单选题The Best Way to Reduce Your Weight You hear this: "No wonder you are fat. All you ever do is eating." You feel sad: "I skip my breakfast and supper. I run every morning and evening. What else can I do?" Basically you can do nothing. Your genes, not your life habits, determine your weight and your body constantly tries to maintain it. Albert Stunkard of the University of Pennsylvania found from experiments that, "80 percent of the children of two obese parents become obese, as compared with no more than 14 percent of the offspring of two parents of normal weight." How can obese people become normal or even thin through dieting? Well, dieting can be effective, but the health costs are tremendous. Jules Hirsch, a research physician at Rockefeller University, did a study of eight fat people. They were given a liquid formula providing 600 calories a day. After more than 10 weeks, the subjects lost 45kg on average. But after leaving the hospital, they all regained. The results were surprising by metabolic measurement, fat people who lost large amounts of weight seemed like they were starving. They had psychiatric problems. They dreamed of food or breaking their diet. They were anxious and depressed; some were suicidal. They hid food in their rooms. Researchers warn that it is possible that weight reduction doesn't result in normal weight, but in an abnormal state resembling that of starved non-obese people. Thin people, however, suffer from the opposite: They have to make a great effort to gain weight. Ethan Sims, of the University of Vermont, got prisoners to volunteer to gain weight. In four to six months, they ate as much as they could. They succeeded in increasing their weight by 20 to 25 percent. But months after the study ended, they were back to normal weight and stayed there. This did not mean that people are completely without hope in controlling their weight. It means that those who tend to be fat will have to constantly battle their genetic inheritance if they want to significantly lower their weight. The findings also provide evidence for something scientists thought was true--each person has a comfortable weight range. The range might be as much as 9kg. Someone might weigh 60-69kg without too much effort. But going above or below the natural weight range is difficult. The body resists by feeling hungry or full and changing the metabolism to push the weight back to the range it seeks.

单选题The two banks have announced plans to {{U}}merge{{/U}} next year. A. combine B. sell C. close D. break

单选题My wife wants me to {{U}}do away with{{/U}} my shoes.

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，为每题确定1个最佳选项。{{B}}第一篇{{/B}} Electric Backpack Backpacks (背包) are convenient. They can hold your books, your lunch, and a change of clothes, leaving your hands free to do other things. Someday, if you don't mind carrying a heavy load, your backpacks might also power your MP3 player, keep your cell phone running, and maybe even light your way home. Lawrence C. Rome and his colleagues from the University of Pennsylvania in Philadelphia and the Marine Biological Laboratory in Woods Hole, Mass. , have invented a backpack that makes electricity from energy produced while its wearer walks. In military actions, search-and-rescue operations, and scientific field studies, people rely increasingly on cell phones, global positioning system (GPS) receivers, night-vision (夜视镜) goggles (护目镜), another battery powered devices to get around and do their work. The backpack's electricity-generating feature could dramatically reduce the amount o{ a wearer's load now devoted to spare batteries (备用电池), report Rome and his colleagues in the Sept. 9 Science . The backpack's electricity-creating powers depend on springs used to hang a cloth pack from its metal frame. The frame sits against the wearer's back, and the whole pack moves up and clown as the person walks. Agear mechanism converts vertical movements o{ the pack to rotary motions of an electrical generator, producing up to 7.4 watts. Unexpectedly, tests showed that wearers of the new backpack alter their gaits in response to the pack's oscillations, so that they carry loads more comfortably and with less effort than they do ordinary backpacks. Because of that surprising advantage, Rome plans to commercialize both electric and non-electric versions of the backpack. The backpack could be especially useful for soldiers, scientists, mountaineers, and emergency workers who typically carry heavy backpacks. For the rest of us,power-generating backpacks could make it possible to walk, play video games, watch TV, and listen to music, all at the sametime. Electricity-generating packs aren't on the market yet, but if you do get one eventually, just make sure to look both ways before crossing thestreet !

单选题Motoring Technology 1.2 million road deaths worldwide occur each year, plus a further 50 million injuries. To reduce car crash rate, much research now is focused on safety and new fuels—though some electric vehicle and biofuel research aims at going faster. Travelling at speed has always been dangerous. One advanced area of research in motoring safety is the use of digital in-car assistants. They can ensure you don"t miss important road signs or fall asleep. Most crashes result from human and not mechanical faults. Some safety developments aim to improve your vision. Radar can spot obstacles in fog, while other technology "sees through" big vehicles blocking your view. And improvements to seat belts, pedal(脚踏) controls and tyres are making driving smoother and safer. The colour of a car has been found to be linked with safety, as have, less surprisingly, size and shape. But whatever is in the fuel tank, you don"t want a thief in the driving seat and there have been many innovations (创新). Satellite tracking and remote communications can also come into play if you crash, automatically calling for help. Accidents cause many traffic jams, but there are more subtle interplays between vehicles that can cause jams even on a clear but busy road. Such jams can be analyzed using statistical tools. Robotic drivers could be programmed to make traffic flow smoothly and will perhaps one day be everyone"s personal chauffeur (司机), but their latest efforts suggest that won"t be soon.

单选题At 90, many individuals still remain healthy and energetic. A. intelligent B. rough C. robust D. revivable

单选题The room was furnished with the simplest essentials, a bed, a chair, and a tableA. suppliedB. gatheredC. graspedD. made

单选题The company Urecommended/U that a new petrol station be built here.

单选题The latest car model {{U}}embodies{{/U}} many new improvements. A. consists of B. includes C. makes up D. marks

单选题It's a Ugorgeous/U day anyway.

单选题阅读下面的短文，文中有15处空白，每处空白给出了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。 {{B}}A Biological Clock{{/B}} Every living thing has what scientists call a biological clock that controls behavior. The biological clock tells{{U}} (51) {{/U}}when to form flowers and when the flowers should open. It tells {{U}}(52) {{/U}} when to leave the protective cocoons and fly away, and it tells animals and human beings when to eat, sleep and wake. Events outside the plant and animal {{U}}(53) {{/U}} the actions of some biological clocks. Scientists recently found, for example, that a tiny animal changes the color of its fur {{U}}(54) {{/U}} the number of hours of daylight. In the short {{U}}(55) {{/U}} of winter, its fur becomes white. The fur becomes gray brown in color in the longer hours of daylight in summer. Inner signals control other biological clocks. German scientists found that some kind of internal clock seems to order birds to begin their long migration {{U}}(56) {{/U}} twice each year. Birds {{U}}(57) {{/U}} flying become restless when it is time for the trip, {{U}}(58) {{/U}} they become calm again when the time of the flight has ended. Scientists say they are beginning to learn which {{U}}(59) {{/U}} of the brain contain biological clocks. An American researcher, Martin Moorhead, said a small group of cells near the front of the brain {{U}}(60) {{/U}} to control the timing of some of our actions. These {{U}}(61) {{/U}} tell a person when to {{U}}(62) {{/U}}, when to sleep and when to seek food. Scientists say there probably are other biological clock cells that control other body activities. Dr. Moorhead is studying {{U}}(63) {{/U}} our biological clocks affect the way we do our work. For example, most of us have great difficulty if we must often change to different work hours. {{U}} (64) {{/U}} can take many days for a human body to accept the major change in work hours. Dr. Moorhead said industrial officials should have a better understanding of biological clocks and how they affect workers. He said {{U}}(65) {{/U}} understanding could cut sickness and accidents at work and would help increase a factory's production.

单选题Our statistics show that we consume all that we are capable of producing.

单选题Explorer of the Extreme Deep Oceans cover more than two-thirds of our planet. Yet, just a small fraction of the underwater world has been unexplored. Now, Scientists at the Woods Hole Oceanographic Institution (WHOI) in Massachusetts are building an underwater vehicle that will carry explorers as deep as 6,500 meters (21,320 feet). The new machine, known as a manned submersible (潜艇) or human-operated vehicle (HOV), will replace another one named Alvin which has an amazing record of discovery, playing a key role in various important and famous undersea expeditions. Alvin has been operating for 40 years but can go down only 4,500 meters (14,784 feet). "It"s about time for an upgrade", WHOI researchers say. "Alvin was launched (发动) in 1964. Since then, Alvin has worked between 200 and 250 days a year", says Daniel Fornari, a marine geologist (地址学者) and director of the Deep Ocean Exploration Institute at WHOI. During its lifetime, Alvin has carried some 12,000 people on a total of more than 3,000 dives. "A newer, better versions of Alvin is bound to reveal even more surprises about a world that is still full of mysteries", Fornari says. It might also make the job of exploration a little easier. "We take so much for granted on land," Fornari says. "We can walk around and see with our eyes how big things are. We can see colors, special arrangements." Size-wise, the new HOV will be similar to Alvin. It"ll be about 37 feet long. The setting area inside will be a small sphere, about 8 feet wide, like Alvin. It"ll carry a pilot and two passengers. It will be just as maneuverable (机动的). In most other ways, it will give passengers more opportunities to enjoy the view, for one thing. Alvin has only three windows, the new vehicle will have five, with more overlap so that the passengers and the pilot can see the same thing. Alvin can go up and down at a rate of 30 meters every second, and its maximum speed is 2 knots (about 2.3 miles per hour), while the new vehicle will be able to ascend and descend at 44 meters per second. It"ll reach speeds of 3 knots, or 3.5 miles per hour.

单选题The army should have operated in conjunction with the fleet to raid the enemy's coast.A. togetherB. in successionC. in allianceD. in connection