单选题Jack is a diligent student. A. hardworking B. ambitious C. lazy D. slow

单选题The index is the government"s chief gauge of future economic activity.

单选题Does he Upossess/U the necessary patience to do the job well?

单选题The car is tested for defects before leaving the factory.

单选题Capital punishment was abolished some years ago in some states of the U. S.A. createdB. decoratedC. improvedD. eliminated

单选题On Sunday afternoons, we always {{U}}stroll{{/U}} along the river bank, chatting and laughing.

单选题We are {{U}}certain{{/U}} that he will get over his illness. A. sure B. happy C. surprised D. excited

单选题They have made up their mind to give up smoking.A. triedB. attemptedC. agreedD. decided

单选题下面有3篇短文，每篇短文后有5道题，每题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案。{{B}}第一篇{{/B}} {{B}}Motoring Technology{{/B}} 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 risky. One cutting edge area2of research in motoring safety is the use of digital in-car assistants. They can ensure you don't miss crucial road signs or fall asleep. The use of artificial intelligence software allows these assistants to monitor your driving and makes sure your phone or radio doesn't distract you at a vital moment. 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" high-sided vehicles blocking your view. And improvements to seat belts, pedal 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. And alternatives to fossil-fuel based petrol, such as plant oils, are a hot area of research. Fuel cells based on hydrogen burn cleanly, and are the subject of a serious research effort, But whatever is in the fuel tank, you don't want a thief in the driving seat and there have been many innovations, some using satellite tracking and remote communications, to fight against car theft. These communication systems 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 analysed using statistical tools. Robotic drivers could be programmed to make traffic flow smoothly and will perhaps one day be everyone's personal chauffeur, but their latest efforts suggest that won't be soon.

单选题He has sufficient time to finish the task.A. perfectB. adequateC. greatD. limited

单选题You must shine your shoes. A. lighten B. clean C. wash D. polish

单选题{{B}}第二篇{{/B}} A Very Slow Ride The surface of the earth may seem very stable to you. But you might be amazed if you knew some of the things that are going on under that surface. The earth has an outer shell of rigid pieces called tectonic plates (地壳构造板块). The plates include both ocean floor and dry land. Some have whole continents on top of them. The continents on top of the plates are just going along for a slow ride, moving only about four inches per year. But even this small movement causes three types of big interactions. One type is ocean ridges. These ridges develop in places where two plates are moving away from each other. As the plates separate, hot magma(岩浆) flows up to fill the space. New crust(地壳) builds up on the plate boundaries and causes ocean ridges. These ridges form long mountain ranges, which only rise above the ocean surface in a few places. Another type of reaction—trenches—occurs between two plates that are moving toward each other. As the plates meet, one bends downward and plunges underneath the other. This forms deep ocean trenches. The Marianas Trench off Guam in the western Pacific Ocean has a depth of more than 36,000 feet. This is the lowest point on the ocean floor. If the leading edges of the two colliding plates carry continents, then the layers of rock in the overriding plate crumple(变皱) and fold. A plate that carried what is now India collided with the southern edge of the plate that carried Europe and most of Asia, This caused the Himalayas, the world's highest mountains. The third reaction is transform faults(转换断层). These faults occur where two plates that are traveling in opposite directions slide past each other. Severe earthquakes can occur. The San Andreas Fault in Califonia is a good example of this type of movement.

单选题Cheating deserves our harshest condemnation .

单选题To my mind his Uintegrity/U is above suspicion.

单选题2. Space Junk Cosmos 2251 was an ordinary satellite designed to transmit signals across the vast Russian landmass. Launched in 1993, it would appear every 90 minutes or so over the northern skies, relay electronic blips of information among a network of satellites and ground stations like a hockey player passing the puck, and disappear over the southern horizon. Iridium 33, launched for Motorola in 1997, did something similar, though it took a slightly different orbit that brought it closest to Earth during its pass over North America. For years the two satellites circled the planet, minding their own business, never coming within a thousand kilometers of one another. Then something happened to Cosmos. It may have sprung a small leak; perhaps it struck a tiny asteroid or a piece of debris. Nobody knows for sure, but for one reason or another, Cosmos drifted off course. T. S. Kelso, an aeronautics expert at Analytical Graphics, which provides satellite-tracking services to NASA, noticed that the orbits of Cosmos and Iridium were bringing the two satellites closer to each other all the time. In February he issued a warning that they would pass within a kilometer of one another, tie was right. On Feb. 10, Motorola lost track of Iridium's signal. Over the next few days, Kelso and others surmised that what many had feared for years had finally come to pass: two intact satellites had collided head on. The consequences go far beyond merely the loss of two pieces of property. Each satellite weighed more than half a metric ton and was moving at 7.5 kilometers per second. The resulting explosion was catastrophic, generating a massive cloud of cosmic debris—perhaps l00,000 pieces of junk bigger than one centimeter in diameter, estimates David Wright, a space expert at the Union of Concerned Scientists. In one stroke, the accident increased by nearly a third the number of stray objects in the crucial 700-to-900-kilometer hand known as low Earth orbit (LEO). The junk cloud will eventually disperse around the entire planet, like a shroud. The event served as a wake-up call to space planners. Insurance rates for the $18 billion worth of active commercial satellites now in orbit have ticked upwards by 10 to 20 percent since the accident. Governments, too, have grown to rely on networks of satellites to gather intelligence, direct weapons systems, forecast climate and weather changes, monitor agriculture, and operate communications and navigation systems. Experts calculate that debris will now strike one of the 900 active satellites in LEO every two or three years. For the first time, junk is the single biggest risk factor to equipment in some orbits. Among the orbital threats are two former Soviet nuclear reactors. Even the International Space Station may one day be at risk, as debris slowly descends to its 350-kilometer orbit.

单选题He has established himself to be a competent manager by his successfully handling several difficult tasks. A. definite B. effective C. qualified D. deficient

单选题Will We Take Vacation in Spaces? When Mike Kelly first set out to build his own private space-ferry service, he figured his bread-and-butter business would be lofting satellites into high-Earth orbit. Now he thinks he may have figured wrong. "People were always asking me when they could go," says Kelly, who runs Kelly Space Technology out of San Bernardino, California. "I realized that real market is in space tourism." According to preliminary market surveys, there are 10,000 would-be-space-tourists willing to spend $ 1 million each to visit the final frontier. Space Adventure in Arlington, Virginia, has taken more than 130 deposits for a two-hour, $ 98,000 space tour tentatively (and somewhat dubiously) set to occur by 2005. Gene Meyers of the Space Island Group says: "Space is the next exotic vacation spot." This may all sound great, but there are a few hurdles. Putting a simple satellite into orbit with no oxygen, life support or return trip necessary already costs an astronomical $ 22,000/kg. And that doesn"t include the cost of insuring rich and possibly litigious passenger. John Pike of the Federation of American Scientists acerbically suggests that the entire group of entrepreneurs trying to corner the space tourism market have between them "just enough money to blow up one rocket." The U.S. space agency has plenty of money but zero interest in making space less expensive for the little guys. So the little guys are racing to do what the government has failed to do: design a reusable launch system that"s inexpensive, safe and reliable. Kelly Spaee"s prototype looks like a plane that has sprouted rocket engines. Rotary Rocket in Redwood City, California, has a booster with rotors make a helicopter-style return to Earth; Kistler Aerospace in Kirkland, Washington, is piecing together its versions from old Soviet engines, shuttle-style thermal protection tiles and an elaborate parachute system. The first passenger countdowns are still years away, but bureaucrats at the Federal Aviation Administration in Washington are already informally discussing flight regulations. After all, you can"t be too prepared for a trip to that galaxy far, far away. For those who are intent on joining the 100-mile high club, Hilton and Budget are plotting to build space hotels. Before the Russian space Mir came down, some people were talking about using it as a low-rent space hotel to reduce the cost. If a space hotel is finally built in space, and if you"re thinking of staying in it, you may want to check the Michelin ratings before booking yourself a suite.

单选题 下面有3篇短文，每篇短文后有5道题，每题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案。{{B}}第一篇{{/B}} {{B}} Eat Healthy{{/B}} “Clean your plate!” and “Be a member of the clean plate club!” Just about every kid in the US has heard this from a parent or grandparent. Often, it’s accompanied by an appeal: “Just think about those starving orphans in Africa!” Sure, we should be grateful for every bite of food. Unfortunately, many people in the US take too many bites. Instead of staying “clean the plate”, perhaps we should save some food for tomorrow. According to news reports, US restaurants are partly to blame for the growing bellies. A waiter puts a plate of food in front of each customer, with two to four times the amount recommended by the government, according to a USA Today story. Americans traditionally associate quantity with value and most restaurants try to give them that. They prefer to have customers complain about too much food rather than too little. Barbara Rolls, a nutrition professor at Pennsylvania State University, told USA Today that restaurant portion sizes began to grow in the 1970s, the same time that the American waistline began to expand. Health experts have tried to get many restaurants to serve smaller portions. Now, apparently, some customers are calling for this, too. The restaurant industry trade magazine QSR reported last month that 57 percent of more than 4,000 people surveyed believe restaurants serve ‘portions that are too large; 23 percent had no opinion; 20 percent disagreed. But a closer look at the survey indicates that many Americans who can’t afford fine dining still prefer large portions. 70 percent of those earning at least $150,000 per year prefer smaller portions; but only 45 percent of those earning less than $ 25,000 want smaller. It’s not that working class Americans don’t want to eat healthy. It’s just that, after long hours at low-paying jobs, getting less on their plate hardly seems like a good deal. They live from paycheck to paycheck, happy to save a little money for next year’s Christmas presents.

单选题Many economists have given in to the fatal lure of mathematics.A. errorB. functionC. attractionD. miracle

单选题We must abide by the rules. A. stick to B. persist in C. safeguard D. apply