单选题Human Space Exploration While scientists are searching the cause of the Columbia disaster, NASA．is moving ahead with plans to develop a new craft that would replace shuttles (航天飞机) on space station missions by 2012 and respond quickly to space station emergencies. The space agency released the first set of mission needs and requirements several days ago for the orbital space plane (轨道航天飞机), which would be designed to transport a crew of four to and from the International Space Station. Although it includes few specifics, the plan states the orbiter (轨道航天飞机) will be safer, cheaper and require less preparation time than the shuttle. It would be able to transport four crew members by 2012—though it would be available for rescue missions by 2010. NASA．says the craft should be able to transport injured or ill space station crew members to "definitive (决定性的) medical care" within 24 hours. The release of the requirements showed NASA．remains focused on the long-term priorities of space exploration, even as questions exist concerning the loss of Columbia and its seven-member crew on February 1,2003. Experts at Marshall Space Flight Center in Huntsville, Alabama, have been working for years on a successor to the shuttle. The project, known as the Space Launch Initiative (倡议), was divided last year into two parts—one focusing on a future launch vehicle, the other on a space station orbiter. The orbiter is expected to be ready sooner. The program's managers say NASA officials have told them not to alter Space Launch Initiative in light of the Columbia disaster. U.S. President George W. Bush asked Congress for about U.S. $1 billion for Space Launch Initiative in 2004, funds that would be almost equally split between the Orbital Space Plane and Next Generation Launch Technology.

单选题The new style of shoes appeals to those students.A. arisesB. absorbsC. attractsD. accepts

单选题Puerto Rican Cuisine（菜肴） Puerto Rico, a Caribbean (加勒比海区) island rich in history and remarkable natural beauty, has a cuisine all its own. Immigration（移民） to the island has helped to shape its cuisine, with people from all over the world making various contributions to it. However, before the arrival of these immigrants, the Taino people lived on the island of Puerto Rico. Taino cuisine included such foods as rodents (啮齿动物), fresh shellfish and fish fried in corn oil. Many aspects of Taino cuisine continue today in Puerto Rican cooking, but it has been heavily influenced by the Spanish, who invaded Puerto Rico in 1508, and Africans, who were initially brought to Puerto Rico to work as slaves. Taino cooking styles were mixed with ideas brought by the Spanish and Africans to create new dishes. The Spanish extended food choices by bringing cattle, pigs, goats, and sheep to the island. Africans also added to the island's food culture by introducing powerful, contrasting tastes in dishes. In fact, much of the food Puerto Rico is now famous for - coffee, coconuts, and oranges - was actually imported by foreigners to the island. A common assumption many people make about Puerto Rican food is that it is very spicy(辛辣的). lt's true that chili peppers are popular; aij caballero in particular is a very hot chili pepper that Puerto Ricans enjoy. However, milder(微辣的) tastes are popular too, such as sofrito. As the base of many Puerto Rican dishes, sofrito is a sauce made from chopped onions, green bell peppers, sweet chili peppers, and a handful of other spices. It is fried in oil and then added to other dishes.

单选题One of California"s greatest problems is providing adequate water to meet the needs of its expanding population.

单选题The game requires us to find out two {{U}}simple{{/U}} but effective ways to solve this problem.

单选题Norman Blarney is an artist of deep convictions .

单选题The first scientific air flight was designed by

单选题They are giant geometric patterns, which appear over-night in a field of crops. Many people believe that they are made by aliens. Others call them hoaxes. " Crop circle", as the mysterious patterns are called, became a hot phrase this month. A strange pattern 360 feet (110 meters) in diameter was discovered earlier this month in a wheat field in Oxfordshire, England. It's believed to be the world's first three-dimensional crop circle. The giant crop circle gives an impression of looking down on skyscrapers from above. The design's discovery immediately generated a new tide of public interest in this mysterious phenomenon. Crop circles were first widely noticed in the late 1970s as many mysterious circles began appearing in crop fields throughout the English countryside. People were intrigued by these giant patterns. They were huge (at least tens of meters in diameters) and popped up over-night. No one knew how or by whom they were made. The world's first three-dimensional crop circle appearedA. in a wheat field in Oxfordshire.B. throughout the countryside of Oxfordshire.C. in the English countryside in the 1970s.D. in all the wheat fields in the English countrysid

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, 16 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 17 with cameras and lights and can send images back to surgeons and others have surgical 18 attached that can be controlled remotely. "We think this is going to 19 open surgery," Dr. Dmitry Oleynikov said at a news conference. Oleynikov is a specialist 20 computer-assisted surgery at the University of Nebraska Medical Center in Omaha. Officials hope that NASA will teach 21 to use the robots soon enough so that surgeries could one day be performed in space. On earth, the surgeons could 22 the robots themselves from other locations. For example, the robots could 23 surgeons in other places to work on injured soldiers on the front line. Researchers plan to seek federal regulatory (联邦管理局的) 24 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 25 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 better than the naked eye, because they send back color images that are magnified (放大). Because several robots can be 26 through one incision, they could reduce the 27 and size of cuts needed for surgery, which would 28 recovery time. This is particularly helpful to those patients who have been debilitated (使虚弱) by long illness. Eventually, Oleynikov said, the tiny robots may enable surgeons to 29 without ever placing their hands in patients" bodies. "That"s the goal;" Oieynikov said. "It"s get— ting easier and easier. We can do even more with these 30 ."

单选题If the symptoms persist , consult your doctor.

单选题In Britain and many other countries appraisal is now a tool of management. A．evaluation B．production C．efficiency D．publicity

单选题This is the remarkable food in this area, which is worldly famous.A. particularB. characteristicC. famousD. special

单选题 Exercise Being Good or Bad Can exercise be a bad thing? Sudden death during or soon after strenuous exertion on the squash court or on the army training grounds, is not unheard of. {{U}} {{U}} 1 {{/U}} {{/U}}trained marathon runners are not immune to fatal heart attacks. But no one knows just {{U}} {{U}} 2 {{/U}} {{/U}}common these sudden deaths linked to exercise are. The registration and investigation of such {{U}} {{U}} 3 {{/U}} {{/U}}is very patchy; only a national survey could determine the true {{U}} {{U}} 4 {{/U}} {{/U}}of sudden deaths in sports. But the climate of medical opinion is shifting in {{U}} {{U}} 5 {{/U}} {{/U}}of exercise, for the person recovering from a heart attack as {{U}} {{U}} 6 {{/U}} {{/U}}as the average lazy individual. Training can help the victim of a heart attack by lowering the {{U}} {{U}} 7 {{/U}} {{/U}}of oxygen the heart needs at any given level of work {{U}} {{U}} 8 {{/U}} {{/U}}the patient can do more before reaching the point where chest pains indicate a heart starved of oxygen. The question is, should middle-aged people, {{U}} {{U}} 9 {{/U}} {{/U}}particular, be screened for signs of heart disease before {{U}} {{U}} 10 {{/U}} {{/U}}vigorous exercise? Most cases of sudden death in sport are caused by lethal arrhythmias in the beating of the heart, often in people {{U}} {{U}} 11 {{/U}} {{/U}}undiagnosed coronary heart disease. In North America {{U}} {{U}} 12 {{/U}} {{/U}}over 35 is advised to have a physical check-up and even an exercise electrocardiogram. The British, on the whole, think all this testing is unnecessary. Not many people die from exercise, {{U}} {{U}} 13 {{/U}} {{/U}}, and ECGs (心电图) are notoriously inaccurate. However, two medical cardiologists at the Victoria Infirmary in Glasgow, advocate screening by exercise ECG for people over 40, or younger people {{U}} {{U}} 14 {{/U}} {{/U}}at risk of developing coronary heart disease. Individuals showing a particular abnormality in their ECGs {{U}} {{U}} 15 {{/U}} {{/U}}, they say, a 10 to 20 times greater risk of subsequently developing signs of coronary heart disease, or of sudden death.

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They got in quite a brawl .

单选题Gambling is {{U}}lawful in{{/U}} Nevada?

单选题John has made up his mind not to go to the meeting.

单选题We should not sacrifice environmental protections to foster economic growth.

单选题The Theory of Everything If Stephen Hawking lives until the year 2017, he will have lived more than 50 years longer than his doctors expected. When he was a college student, doctors discovered that he had a rare disease. This disease causes a gradual disintegration (分解) of the nerve cells in the brain cells that regulate voluntary muscle activity. Death almost always occurs within two or three years. Today Stephen Hawking cannot walk or speak. He cannot move his arms or his head. He cannot taste or smell anything. And yet this man is Professor of Mathematics at Cambridge University, a position held by the famous scientist Isaac Newton in 1669. Hawking is often described as the greatest scientist since Albert Einstein, but to the world outside science, he is also known as the man who made scientific theory understandable. His book, A Brief History of Time , has sold over eight million copies. He says that since he does not have to think about his body or do any of the things other men have to worry about, such as washing the car or working in the yard, he can dedicate all of his time to thinking. This puts him in the perfect position to find the answer to the question that he has dedicated his life to. His question is: Is there a complete theory of the universe and everything in it? Despite his tremendous physical disabilities, he has already made some very important discoveries about the origin of the universe, how the universe holds together, and how it will probably end. He has also been able to explain the secrets of "black holes" in space. Now he is looking for a set of rules that everything in our universe must obey. He calls it the Theory of Everything: He thinks that someone will have found the answer within the next 20 years. If Stephen Hawking is able to find his Theory of Everything, he will have given the world the opportunity to understand things that will change the whole nature of science and probably also the way we live.

单选题Safety is always my primary concern. A. secondary B. least C. last D. chief