单选题As early as 1647, Ohio made a decision that free, tax-supported schools must be established in every town 50 households or more. A. having B. to have C. to have had D. having had

单选题In the darkness, it is difficult for us to ______ the tower from the other buildings around it. A. distinguish B. divide C. separate D. discover

单选题{{B}}21-25{{/B}} For centuries, explorers have risked their lives venturing into the unknown for reasons that were to varying degrees economic and nationalistic. Columbus went west to look for better trade routes to the Orient and to promote the greater glory of Spain. Lewis and Clark journeyed into the American wilderness to find out what the U.S. had acquired when it purchased Louisiana, and the Appolo astronauts rocketed to the moon in a dramatic show off technological muscle during the cold war. Although their missions blended commercial and political-military imperatives, the explorers involved all accomplished some significant science simply by going where no scientists had gone before. Today Mars looms (隐约出现) as humanity's next great terra incognita (未探明之地). And with doubtful prospects for a short-term financial return, with the cold war a rapidly fading memory and amid a growing emphasis on international cooperation in large space ventures, it is clear that imperatives other than profits or nationalism will have to compel human beings to leave their tracks on the planet's reddish surface. Could it be that science, which has long played a minor role in exploration, is at last destined to take a leading role? The question naturally invites a couple of others: are there experiments that only humans could do on Mars? Could those experiments provide insights profound enough to justify the expense of sending people across interplanetary space? With Mars the scientific stakes are arguably higher than they have ever been. The issue of whether life ever existed on the planet, and whether it persists to this day, has been highlighted by mounting evidence that the Red Planet once had abundant stable, liquid water and by the continuing controversy over suggestions that bacterial fossils rode to Earth on a meteorite (陨石) from Mars. A more conclusive answer about life on Mars, past or present, would give researchers invaluable data about the range of conditions under which a planet can generate the complex chemistry that leads to life. If it could be established that life arose independently on Mars and Earth, the finding would provide the first concrete clues in one of the deepest mysteries in all of science: the prevalence of life in the universe.

单选题The blues was born on the Mississippi River Delta in the early 1900s. After the Civil War, the slaves were free but life was still not easy. They had to find new work. In the South, work camps were formed. Black people from these camps worked on farms and on building up the Mississippi River banks. During the week the people worked long and hard. They often lived alone, without their families, far from home. On the weekends, the workers got together at picnics or drinking places. Traveling black musicians with guitars entertained them. The musicians sang songs about the difficult life of the Workers. These songs were called the blues. If you have the blues it means you feel very sad. But blues songs were not always sad. Some of them were happy and many of them were funny. Early blues singers often had very interesting names like Blind Lemon Jefferson, Howlin Wolf. Sometimes the blues singers had song contests. Each singer sang new words or a new style of the blues song. They made up the music as they played. In this way they created new music. This is called improvisation (即兴演奏). Later, improvization became a very important part of jazz music. Blues began in the country in the South. As blacks moved into the big cities to work, the blues went with them. There, they sang about life in the cities. W.C. Handy, a black band leader from Memphis made the blues popular all over America. In 1914 he wrote the most famous blues song of all, "The St. Louis Blues./

单选题 Because of its potential for cutting costs, the distribution step in the marketing process is receiving more attention. Distribution involves warehousing, transporting and keeping inventory of manufactured products. Take an everyday product like fabric softener. After it comes off the assembly line, it's packed in cartons and trucked to warehouses around the country. When orders come in from retailers, the fabric softener is delivered to supermarket shelves. This is distribution. Probably the most crucial area for controlling costs is inventory. Companies don't want to overproduce and have unsold stock of their product piled up in warehouses. Wholesale companies and large retail chains employ several techniques for inventory control. This is where the computer revolution really had an impact. Computerized information systems give precise and up-to-date accounts of inventory on hand. And the field of distribution offers good entry-level jobs for persons with training in computer programming or data processing. Overseeing the whole area of distribution is the distribution manager. This job is becoming increasingly important and can lead to an executive position.

单选题This material______well.

单选题 Passage 8 Excitement, fatigue, and anxiety can all be detected from someone's blinks, according to psychologist John Stern {{U}}(1) {{/U}} Washington University in St. Louis. Stern specialized in the study on these tiny twitches, using them as sensitive {{U}}(2) {{/U}} of how the brain works. "I use blinks as a psychological measure to make {{U}}(3) {{/U}} about thinking because I have very little {{U}}(4) {{/U}} in what you tell me about what you ,are thinking." He says. "If I ask you the question, 'what does the phrase a rolling stone gathers no moss mean?' you can't tell me {{U}}(5) {{/U}} you've started looking for the answer. But I can, by watching your eyes." Blinks also tell Stem when you have understood his question--often long before he's finished asking it--and when you've found an answer or part of {{U}}(6) {{/U}}. "We blink at times {{U}}(7) {{/U}} are psychologically important." He says. "You have listened to a question, you understand it, {{U}}(8) {{/U}} you can take time out for a blink. Blinks are {{U}}(9) {{/U}} marks. Their timing is tied to what is going on in your {{U}}(10) {{/U}}." Stem has found that {{U}}(11) {{/U}} suppress blinks when they are absorbing or anticipating {{U}}(12) {{/U}} but not when they're reciting it. People blink later, for example, {{U}}(13) {{/U}} they have to memorize six numbers instead of two. "You don't blink," he says, "until you have {{U}}(14) {{/U}} the information to some short-term memory store." And if subjects are cued {{U}}(15) {{/U}} the set of numbers is coming, say, five seconds, they'll curb their blinks until the task is {{U}}(16) {{/U}} Similarly, the more important the information that people are taking in, the more likely they are to put their blinks on hold for {{U}}(17) {{/U}}. Pilots blink less when they're {{U}}(18) {{/U}} for flying a plane than when they {{U}}(19) {{/U}} their eyes from the road to the rearview mirror. But if they see the flashing lights of a state trooper behind them, their {{U}}(20) {{/U}} will move fast unmoistened to the speedometer and back to the mirror.

单选题His government insisted that he ______ until he finished his degree.

单选题It is a very important game, and it is advisable to ______ seats well in advance.

单选题Questions 11-15 are based on the following passage: Although no one is certain why migration occurs, there are several theories. One theory claims that prehistoric birds of the Northern Hemisphere were forced south during the Ice Age. As the glaciers melted, the birds came back to their homelands, spent the summer, and then went south again as the ice advanced in winter. In time, the migration became a habit in spite of the disappearance of glaciers. Another theory proposes that the ancestral home of all modern birds was the tropics. When the region became overpopulated, many species were crowded north. During the summer, there was plenty of food, but during the winter, scarcity forced them to return to the tropics. A more recent theory suggests a relationship between increasing daylight and the stimulation of certain glands (腺) in the birds' bodies that may prepare them for migration. One scientist has been able to cause midwinter migrations by exposing birds to artificial periods of daylight. He has concluded that changes occur in the bodies of birds due to seasonal changes in the length of daylight.

单选题The author states that birds left the tropics because ______.

单选题If ______ and lodging are included in educational fees, a university student in the U.S. will need approximately $10,000 a year. A. meal B. board C. food D. provisions

单选题It can be inferred from the passage that by 1870 ______.

单选题When does the typing service close on Wednesday?

单选题(Some) methods (to prevent) soil erosion(侵蚀) ) (are) plowing parallel with the slopes of hills, (to plant) trees on unproductive land, and rotating crops.

单选题In the late 1960's, many people in North America turned their attention to environmental problems, and new steel-and-glass skyscrapers were widely criticized. Ecologists pointing (21) that a cluster of tall buildings in a city often overburdens public transportation and parking lot (22) . Skyscrapers are also enormous (23) , and wasters, of electric power. In one recent year, the addition (24) 17 million square feet of skyscraper office space in New York City raised the (25) daily demand for electricity by 120,000 kilowatts-- enough to (26) the entire city of Albany for a day. Glass-wailed skyscraper can be especially (27) . The heat loss (or gain) through a wall of half-inch plate glass is more than ten times (28) through a typical masonry wall filled with insulation board. To lessen the strain (29) heating and air-conditioning equipment, (30) of skyscrapers have begun to use double-glazed panels of glass, and reflective glasses (31) with silver or gold mirror films that reduce (32) as well as heat gain. However, (33) skyscrapers raise the temperature of the surrounding air and (34) neighboring buildings. Skyscrapers put severe pressure on a city's sanitation (35) , too. If fully occupied, the two World Trade Center towers in New York City would alone generate 2.25 million gallons of raw sewage each year--as (36) as a city the size of Stamford, Connecticut, which has a (37) of more than 109,000. Skyscrapers also (38) with television reception, block bird flyways, and obstruct air traffic. Still, people (39) to build skyscrapers for all the reasons that they have always built them--personal ambition and the (40) of owners to have the largest possible amount of rentable space.

单选题Questions 26-30 are based on the following passage: 　　　　　　　　　　　　　　　　　　Help Wanted Ad Outstanding opportunity with local real estate corporation. Requires strong background in real estate, financing. Some legal training helpful. Prefer candidate with M. A. and two or more years of successful real estate experience. Broker's license required. Salary range $ 50,000-$ 80,000 yearly in accordance with education and experience. Begin immediately. Interviews will be conducted Tuesday and Thursday, June 10 and 12. Call for an appointment 243-11522,or send a letter of application and resume to:Personnel Department　　Executive Real Estate Corporation　　500 Capital Avenue　　Lawrence, Kansas 67884

单选题Humans are unique in the extent to which they can reflect on themselves and others. Humans are able to (1) , to think in abstract terms, to reflect on the future. A meaningless, (2) world is an insecure world. We do not like extensive insecurity. When it (3) to human behavior we infer meaning and (4) to make the behavior understandable. (5) all this means is that people develop "quasi theories" of human behavior, that is, theories that are not developed in a(an) (6) , scientific manner. When doing so, people believe they know (7) humans do the things they do. Let's consider an example. In the United States people have been (8) with the increasing amount of crime for several years. The extent of crime bothers us; we ourselves could be victims. But it (9) bothers us that people behave in such ways. Why can such things happen? We develop quasi theories. We (10) concerned about the high crime rate, but we now believe we (11) it: our criminal justice system is (12) ; people have grown selfish and inconsiderate as our moral values weaken (13) the influence of liberal ideas; too many people are (14) drugs. These explanations suggest possible solutions. (15) the courts; put more people in jail as examples to other lawbreaker. There is now hope that the problem of crime can be solved if only we (16) these solutions. Again, the world is no longer meaningless nor (17) so threatening. These quasi theories (18) serve a very important function for us. But how accurate are they? How (19) will the suggested solutions be? These questions must be answered with (20) to how people normally go about developing or attaining their quasi theories of human behavior.

单选题He was offered the presidency of that country but he declined it, saying that he didn't have good health.

单选题Speaker A: Did you have a good crossing?Speaker B: ______. It was really rough and I'm not a good sailor.