单选题The symptoms of the disease Umanifested/U themselves ten days later.

单选题These are our motives for doing it.A. reasonsB. argumentsC. targetsD. pursuit

单选题This kind of animals are on the verge of Uextinction/U, because so many are being killed for their fur.

单选题There is a growing gap between the rich and the poor.

单选题At the end of the passage the author suggests that A. it is impossible for life to exist on other planets. B. earthlike life could only exist on a few planets. C. life could exist on only one planet in a million. D. life could exist on a great number of planets.

单选题What were the {{U}}effects{{/U}} of the decision she made?

单选题Don't Count on Dung "Conservationists(自然保护主义者)may be miscalculating the numbers of the threatened animals such as elephants, " say African and American researchers. The error occurs because of a flaw in the way they estimate animal numbers from the piles of dung(粪)the creatures leave behind. The mistake could lead researchers to think that there are twice as many elephants as there really are in some regions according to Andrew Plumptre of the Wildlife Conservation Society(WCS) in New York. Biologist Katy Payne of Cornell University in Ithaca, New York, agrees. "We really need to know elephant numbers and the evidence that we have is quite indirect, "says Payne, who electronically tracks elephants Counting elephants from planes is impossible in the vast rainforests of Central Africa. So researchers often estimate elephant numbers by counting dung piles in a given area. They also need to know the rate at which dung decays because it's extremely difficult to determine these rates. However, researchers counting elephants in one region tend to rely on standard decay rates established elsewhere. "But researchers at the WCS have found that this decay rate varies from region to region depending on the climate and environment. Using the wrong values can lead the census astray(离开正道)," says Plumptre. He and his colleague Anthony Chifu Nchanji studied decaying elephant dung in the forests of Cameroon. They found that the dung decayed between 55 and 65 per cent more slowly than the dung in the rainforests of neighbouring Gabon. If researchers use decay rates from Gabon to count elephants in Cameroon, they would probably find more elephants than are actually around. "This could mean estimates in Cameroon are at least twice as high as those derived from decay rates calculated locally," says Plumptre "However accurate your dung density estimate might be the decay rate can severely affect the result." Plumptre also says that the dung-pile census should be carried out over a region similar in size to an elephant's natural range. The usual technique of monitoring only small, protected areas distorts numbers because elephants move in and out of these regions, he says" If the elephant population increases within the protected area, you can not determine whether it is a real increase or whether it is due to elephants moving in because they are being poached(入侵偷猎)outside. " Plumptre says that similar problems may also affect other animal census studies that rely on indirect evidence such as nests, tracks or burrows(地洞).

单选题Some insects rely on the tiny hairs scattered over their bodies to sense sound waves.

单选题The Beginning of American Literature American has always been a land of beginnings. After Europeans "discovered" America in the fifteenth century, the mysterious New World became for many people a genuine hope of a new life, an escape from poverty and persecution, a chance to start again. We can say that, as nation, America begins with that hope . When, however, does American literature begin? American literature begins with American experiences. Long before the first colonists arrived, before Christopher Columbus, before the Northmen who "found" America about the year 1,000, native Americans lived here. Each tribe"s literature was tightly woven into the fabric of daily life and reflected the unmistakably American experience of lining with the land. Another kind of experience, one filled with fear and excitement, found its expression in the reports that Columbus and other explorers sent home in Spain, French and English. In addition, the journals of the people who lived and died in the New England wilderness tell unforgettable tales of hard and sometimes heartbreaking experiences of those early years. Experience, then, is the key to early American literature. The New World provided a great variety of experiences, and these experiences demanded a wide variety of expressions by an even wider variety of early American writers. These writers included John Smith, who spent only two-and-a-half years on the American continent. They included Jonathan Edwards and William Byrd, who thought of themselves as British subjects, never suspecting a revolution that would create a United States of America with a literature of its own. American Indians, explorers, Puritan ministers, frontier wives, plantation owner—they are all the creators of the first American literature.

单选题She {{U}}persevered{{/U}} in her ideas despite obvious objections raised by friends.

单选题Don't try to interrupt while others are talking.A. cut downB. cut inC. cut upD. cut off

单选题The pressure on her from her family caused her to {{U}}resort{{/U}} to the drastic measures. A. turn to B. keep to C. stick to D. lead to

单选题The New Technology Application On a more mundane level, third-generation mobile telephones, despite all the delays and the billions squandered on 3G licenses by telecom firms are still expected to offer consumers high-speed, always on mobile internet access, complete with video, in the next few years. Rapidly proliferating "wi-fi" networks already offer wireless access on a local basis. Tiny tracking chips called radio-frequency identification devices are being used as pet passports. Soon they will be small, powerful and cheap enough to be implanted into everything. Sensors of every kind, including video cameras, should also become much smaller and cheaper. Forrester Research, a technology consultancy, predicts that 14 billion such devices will be connected to the internet by 2005. How rapidly such a new technology is introduced will depend on a number of factors the state of the economy, the supply of investment capital and the appetite of consumers for new products or services. Fortunes will be made and lost many times over. But whatever happens, the power of computing .and communications look set to continue to grow, and its price to fall, at a steady rate for the next few decades. That will make it possible, at least in rich countries, to record most human interactions, wherever and whenever they take place, and to store and analyze this ocean of data at low cost. For the sake of argument, this survey will assume that we are heading towards a networked society of ubiquitous, mobile communication capable of constant monitoring. Whether this arrives in 20, 30 or 40 years does not really matter. The point is that the destination seems not merely possible, but probable, so it is not too soon to ask: What do we want this technology to do? The internet has already thrown up a host of legal and political conundrums, but, these are only a small foretaste of the dilemmas about privacy, security, intellectual property and the nature of government itself that will have to be faced over the coming decades. The debate has already begun. This survey will outline some of main issues and speculate on the way they are likely to go.

单选题The word“expertise’’in line 3 could be best replaced by

单选题I have little information as regards her fitness for the post.

单选题Our statistics show that we {{U}}consume{{/U}} all that we are capable of producing.

单选题{{B}}第三篇{{/B}} Snow Ranger The two things—snow and mountains—which are needed for a ski area, are the two things that cause avalanches, large mass of snow and ice crushing down the side of a mountain—often called White Death. It was the threat of the avalanche and its record as a killer of man in the western mountains that created the snow ranger. He first started on avalanche control work in the winter of 1937 at Alta, Utah, in Wasatch National Forest. This mountain valley was becoming well known to skiers. It. was dangerous. In fact, more than 120 persons had lost their lives in 1936 and another 200 died in 1937 as a result of avalanches before it became a major ski area. Thus, development of Alta and other major ski resorts in the west was dependent upon controlling the avalanche. The Forest Service set out to do it, and did, with its corps of snow rangers. It takes many things to make a snow ranger. The snow ranger must be in excellent physical condition. He must be a good skier and a skilled mountain climber. He should have at least a high school education, and the more college courses in geology, physics, and related fields he has, the better. He studies snow, terrain, wind, and weather. He learns the conditions that produce avalanches. He learns to forecast avalanches and to bring them roaring on down the mountainsides to reduce their killing strength. The snow ranger learns to do this by using artillery, by blasting with TNT, and by the difficult and skillful art of skiing avalanches down. The snow ranger, dressed in a green parka which has a bright yellow shoulder patch, means safety for people on ski slopes. He pulls the trigger on a 75 mm. Recoilless rifle, skis waist deep in powder testing snow stability, or talks with the ski area's operator as he goes about his work to protect the public from the hazards of deep snow on steep mountain slopes.

单选题Sleepless at Night It was a normal summer night. Humidity(湿气)hung in the thick air. I couldn't go to sleep, partly because of my cold and partly because of my expectations for the next day. My mum had said that tomorrow was going to be a surprise. Sweat stuck to my aching body. Finally, gathered enough strength to sit up. I looked out of my small window into the night. There was a big bright moon hanging in the sky, giving off a magic light. I couldn't stand the pressure anymore, so I did what I always do to make myself feel better. I went to the bathroom and picked up my toothbrush and toothpaste. I cleaned my teeth as if there was no tomorrow. Back and forth, up and down. Then I walked downstairs to look for some signs of movement, some life. Gladiator, my cat, frightened me as he meowed(喵喵地唱出)his sad song. He was on t11e old orange couch(长沙发), sitting up on his front legs, waiting for something to happen. He looked at me as if to say "I'm lonely, pet me. I need a good hug(紧抱). "Even the couch begged me to sit on it. In one movement I settled down onto the soft couch. This couch represented my parents'marriage, my birth, and hundreds of other little events. As I held Gladiator, my heart started beating heavily. My mind was flooded with questions：What's life? Am I really alive? Are you listening to me? Every time I moved my hand down Gladiator's body, I had a new thought；each touch sang a different song. I forgot all about the heat and the next day's surprise. The atmosphere was so full of warmth and silence that I sank into its alms. Falling asleep with the big cat in my arms, I felt all my worries slowly move away.

单选题Yes, We Speak Cupcake As a young student at the multinational Aramco(阿拉伯) school in Dhahran (达兰), Saudi Arabia (沙特) , Fadi Jaber, a son of Palestinian refugees, always preferred his American classmates'cupcakes, brownies and chocolate chip cookies to his mother' s pastries. But when he tasted a vanilla - frosted vanilla (香草) cupcake from the Magnolia Bakery in Greenwich Village in 2004, it changed his life. He quit his marketing job at Unilever and used his savings to enroll in a baking management program at the Institute of Culinary(烹饪的) Education in Manhattan. And after an internship at Billy's Bakery in Chelsea, he was ready for his next move: In July 2007, in Amman, Jordan, he opened Sugar Daddy's, the shop that brought the cupcake craze to the Middle East. Cupcake shops have become as ubiquitous(到处存在的) as hot dog stands in some American cities, and have spread to Rome ; Istanbul ; Berlin ; Seoul, South Korea; and Sydney, Australia. Now Mr. Jaber has proved that even the Arab world is not immune to such a Western food. Members of Jordan's royal family stop by the shop in jcans and sweatshirts, ordering boxes of cupcakes while their bodyguards wait outside. It is rumored that Queen Rania is a fan. Since December 2008, the shop, which also sells cheesecakes and brownies, has been in the well -to -do neighborhood of Abdoun, which is thick with embassies and upscale (高消费的)restaurants. Mr. Jaber has also opened a Sugar Daddy's in Beirut and in Dubai. Most of his clients were familiar with cupcakes from living or studying abroad. Others knew them from the TV show" Sex and the City" which has been shown on regional satellite stations for a few years. One customer asked him to draw lips on every cupcake. When he asked her why, she replied, "Because that's so' sex and the City. ' " Nabil al- Rabaa, Mr. Jaber's partner in Beirut, where the shop opened late last year, said that while most customers had encountered cupcakes before, there was initial confusion. "There were a lot that would say, "I'll take that muffin, and one of those muffins, "Mr. al - Rabaa said. "Please, these are cupcakes ! "Kamal Mouzawak, a food writer and founder of Lebanon's first farmers' market, said that the chain appeals to the region's historic sweet tooth.

单选题The dentist has decided to extract her bad tooth.