单选题The climate of Earth is changing. Climatologists are confident that over the past century, the global average surface temperature has increased by about half a degree Celsius. This warming is thought to be at least partly the result of human activities, such as the burning of fossil fuels and the clearing of forests for agriculture. As the global population grows and national economies expand, the global average temperature is expected to continue increasing by an additional 1.0~C to 3.5℃by the year 2100. Climate change is one of the most important environmental issues facing humankind. Understanding the potential impacts of climate change for natural ecosystems is essential if we are going to manage our environment to minimize the negative consequences of climate change and maximize the opportunities that it may offer. Because natural ecosystems are complex, nonlinear systems, it follows that their responses to climate change are likely to be complex. Climate change may affect natural ecosystems in a variety of ways. In the short term, climate change can alter the mix of plant species in land ecosystems such as grasslands. In the long term, climate change has the potential to dramatically alter the geographic distribution of major vegetation types—savannas, forests, and climate change can also potentially alter global ecosystem processes, including the cycling of carbon, nitrogen, phosphorus, and sulfur. Moreover, changes in these ecosystem processes can affect and be affected by changes in the plant species of the ecosystem and vegetation type. All of the climate change—induced alterations of natural ecosystems affect the services that these ecosystems provide to humans. The global average surface temperature increase of half a degree .Celsius observed over the past century has been in part due to differential changes in daily maximum and minimum temperatures, resulting in a narrowing of the diurnal temperature range. Decreases in the diurnal temperature range were first identified in the United States, where large-area trends showed that maximum temperatures have remained constant or increased only slightly, whereas minimum temperatures have increased at a faster rate. In this issue, Alward etal. report on the different sensitivities of rangeland plants to minimum temperatures increases.

单选题James: Phil has decided to quit smoking. Kim: Again? ______

单选题A: How's the young man?

单选题Had he worked harder, he ______ the exams. A. must have got through B. would have got through C. would get through D. could get through

单选题According to the airline industry statistics, almost 90% of airline accidents are survivable or partially survivable. But passengers can increase their chances of survival by learning and following certain tips. Experts say that you should read and listen to safety instructions before takeoff and ask questions if you have uncertainties. You should fasten your seat belt low on your hips as tightly as possible. Of course, you should also know how the release mechanism of your belt operates. During takeoffs and landings you are advised to keep your feet flat on the floor. Before takeoff you should locate the nearest exit and an alternative exit and count the rows of seats between you and the exits so that you can find them in the dark if necessary. In the event that you are forewarned of a possible accident, you should put your hands on your ankles and keep your head down until the plane comes to a complete stop. If smoke is present in the cabin, you should keep your head low and cover your face with napkins, towels, or clothing. If possible, wet these for added protection against smoke inhalation. To evacuate as quickly as possible, follow crew commands and do not take personal belongings with you. Do not jump on escape slides before they are fully inflated, and when you jump, do so with your arms and legs extended in front of you. When you get to the ground, you should move away from the plane as quickly as possible, and never smoke near the wreckage.

单选题Mobiles are popular among people because ______.

单选题There's no comparison between them, one ______ clearly much better than the other. A. being B. was C. be D. having been

单选题The knowledge scientists now possess about human brain differs ______ from the theories of ancient times. A. greatly B. largely C. mainly D. basically

单选题 Today is the anniversary of that afternoon in April a year ago that I first saw the strange and appealing doll(玩具娃娃)in the window of Abe Sheftel's toy shop on Third Avenue near Fifteenth Street, just around the corner from my office, where the plate on the door reads: Dr. Samuel Amory. I remember just how it was that day: the first hint of spring floated across the East River, mixing with the soft-coal smoke from the factories and the street smells of the poor neighborhood. As I turned the comer on my way to work and came to Sheftel's, I was made once more aware of the poor collection of toys in the dusty window, and I remembered the approaching birthday of a small niece of mine in Cleveland, to whom I was in the habit of sending modest gifts. Therefore, I stopped and examined the window to see if there might be anything suitable, and looked at the confusing collection of unappealing objects- a red toy fire engine, some lead soldiers, cheap baseballs, bottles of ink, pens, yellowed envelopes, and advertisements for soft-drinks. And thus it was that my eyes eventually came to rest upon the doll stored away in one corner, a doll with the strangest, most charming expression on her face. I could not wholly make her out, due to the shadows and the film of dust through which I was looking, but I was aware that a tremendous impression had been made upon me as though I had run into a person, as one does sometimes with a stranger, with whose personality one is deeply impressed.

单选题______ had been expected, he opposed to the plan.

单选题Some people believe that international sport creates goodwill between the nations and that if countries play games together they will learn to live together. Others say that the opposite is true: that international contests encourage false national pride and lead to misunderstanding and hatred. There is probably some truth in both arguments, but in recent years the Olympic Games have done little to support the view that sports encourage international brotherhood. Not only was there the tragic incident involving the murder of athletes, but the Games were also ruined by lesser incidents caused principally by minor national contests. One country received its second-place medals with visible indignation after the hockey final. There had been noisy scenes at the end of the hockey match, the losers objecting to final decisions. They were convinced that one of their goals should not have been disallowed and that their opponents' victory was unfair. Their manager was in a rage when he said: "This wasn't hockey. Hockey and the International Hockey Federation are finished." The president of the Federation said later that such behavior could result in the suspension of the team for at least two years. The American basketball team announced that they would not yield first place to Russia, after a disputable end to their contest. The game had ended in disturbance. It was thought at first that the United States had won, by a single point, but it was announced that there were three seconds still to play. A Russian player then threw the ball from one end of the court to the other, and another player popped it into the basket. It was the first time the USA had ever lost an Olympic basketball match. An appeal jury debated the matter for four and a half hours before announcing that the result would stand. The American players then voted not to receive the silver medals. Incidents of this kind will continue as long as sport is played competitively rather than for the love of the game. The suggestion that athletes should compete as individuals, or in non-national teams, might be too much to hope for. But in the present organization of the Olympics there is far too much that encourages aggressive patriotism.

单选题Passage 1 A major reason for conflict in the animal world is territory. The male animal (1) an area. The size of the area is sufficient to provide food for him, his (2) and their offspring. Migrating birds, for example, (3) up the best territory in the order of "first come, first (4) ." The late arrivals may acquire (5) territories, but less food is available, or they are too close to the (6) of the enemies of the species. (7) there is really insufficient food or the danger is very great, the animal will not (8) . In this way, the members of the species which are less fit will not have offspring. When there is conflict (9) territory, animals will commonly use force, or a (10) of force, to decide which will stay and which will go. It is interesting to note, however, that animals seem to use (11) the minimum amount of force (12) to drive away the intruder. There is usually no killing. In the (13) of those animals which are capable of doing each other great harm, (14) is a system for the losing animal to show the winning animals that he (15) to submit. When he shows this, the (16) normally stops fighting. Animals (especially birds), which can easily escape from conflict seem to have. (17) obstacle against killing, and equally no mechanism (18) submission. The losing bird simply flies away. However, if two doves are (19) in a cage, and they start fighting, they will continue to fight until one kills the other. We all think of the dove as a symbol of peace and, in its natural habitat, it is peaceful. But the "peace" mechanism does not (20) in a cage.

单选题In the United States elementary education begins at the age of six. At this stage nearly all the teachers are women, mostly married. The atmosphere is usually very friendly, and the teachers have now accepted the idea that the important thing is to make the children happy and interested. The old authoritarian (要绝对服从的) methods of education were discredited (不被认可) rather a long time ago—so much so that many people now think that they have gone too far in the direction of trying to make children happy and interested rather than giving them actual instruction. The social education of young children tries to make them accept the idea that human beings in a society need to work together for their common good. So the emphasis is on cooperation rather than competition throughout most of this process. This may seem curious, in view of the fact that American society is highly competitive; however, the need for making people sociable in this sense has come to be regarded as one of the functions of education. Most Americans do grow up with competitive ideas, and obviously quite a few as criminals, but it is not fair to say that the educational system fails. It probably does succeed in making most people sociable and ready to help one another both in material ways and through kindness and friendliness.

单选题Mom used to be very busy at that time and had to put me ______ the care of my grandma. A. for B. at C. on D. in

单选题"You are very selfish. It's high time you______that you are not the most important personin the world." Edgar said to his boss angrily. A. realized B. have realized C. realize D. should realize

单选题 After a 300 million yuan renovation project, Lidai Diwang Miao, or the Imperial Temple of Emperors of Successive Dynasties, was reopened to the public last weekend. Originally constructed about 470 years ago, during the reign of Emperor Jiajing of the Ming Dynasty, the temple was used by emperors of both the Ming and Qing to offer sacrifices to their ancestors. It underwent two periods of renovation in the Qing Dynasty, during the reigns of emperors Yongzheng and Qianlong. From 1929 until early 2000, it was part of Beijing No. 159 Middle School. The temple's Jingdechongsheng Hall contains stone tablets memorializing 188 Chinese emperors. The finzhuan bricks used to pave the floor, the same as those used in the Forbidden City, are finely textured and golden-yellow in color. According to Xi Wei, an official from the Xicheng District government present at the re-opening of the temple, jinzhuan bricks were made in Yuyao, Suzhou, specially for imperial use. The renovation was done strictly according to that carded out at the orders of Emperor Qianlong, and only those sections of the temple too damaged to repair have been replaced.

单选题______ could be a suitable title for the passage.

单选题戏剧引进中国之后，20世纪20年代末，将其定名为“话剧”的是著名戏剧家( )。

单选题German Chancellor (首相) Otto Von Bismarck may be most famous for his military and diplomatic talent, but his legacy (遗产) includes many of today's social insurance programs. During the middle of the 19th century, Germany, along with other European nations, experienced an unprecedented rash of workplace deaths and accidents as a result of growing industrialization. Motivated in part by Christian compassion (怜悯) for the helpless as well as a practical political impulse to undercut the support of the socialist labor movement, Chancellor Bismarck created the world's first workers' compensation law in 1884. By 1908, the United States was the only industrial nation in the world that lacked workers' compensation insurance. America's injured workers could sue for damages in a court of law, but they still faced a number of tough legal barriers. For example, employees had to prove that their injuries directly resulted from employer's negligence and that they themselves were ignorant about potential hazards in the workplace. The first state workers' compensation law in this country was passed in 1911, and the program soon spread throughout the nation. After World War Ⅱ, benefit payments to American workers did not keep up with the cost of living. In fact, real benefit levels were lower in the 1970s than they were in the 1940s, and in most states the maximum benefit was below the poverty level for a family of four. In 1970, President Richard Nixon set up a national commission to study the problems of workers' compensation. Two years later, the commission issued 19 key recommendations, including one that called for increasing compensation benefit levels to 100 percent of the states' average weekly wages. In fact, the average compensation benefit in America has climbed from 55 percent of the states' average weekly wages in 1972 to 97 percent today. But, as most studies show, every 10 percent increase in compensation benefits results in a 5 percent increase in the numbers of workers who file for claims. And with so much more money floating in the workers' compensation system, it's not surprising that doctors, and lawyers have helped themselves to a large slice of the growing pie.