单选题The most crucial problem any economic system faces is how to use its scarce resources.

单选题The ability to react to environmental stimuli is a basic and general characteristic of living organisms.

单选题She always finds fault with everything.A. simplifiesB. evaluatesC. criticizesD. examines

单选题{{B}}第二篇{{/B}} Oceanography Oceanography has been defined as "the application of all sciences to the study of the sea. " Before the nineteenth century, scientists with an interest in the sea were few. Certainly Newton considered some theoretical aspects of it in his writings, but he was reluctant to go to sea to farther his work. For most people the sea was remote, and with the exception of early intercontinental (大陆间的 ) travelers or others who earned a living from the sea, there was little reason to ask many questions about it, let alone to ask what lay beneath the surface. The first time that the question-" what is at the bottom of the oceans?" had to be answered with any commercial consequence was when the laying of a telegraph cable from Europe to America was proposed. The engineers had to know the depth profile(起伏形状)of the route to estimate the length of cable that had to be manufactured. It was to Maury of the LIS Navy that the Atlantic Telegraph Company turned, in 1853, for information on this matter. In the 1840s, Maury had been responsible for encouraging voyages during which soundings(测水深) were taken to investigate the depths of the North Atlantic and Pacific Oceans. Later, some of his findings aroused much. popular interest in his book "The Physical Geography of the Sea". The cable was laid, but not until 1866 was the connection made permanent and reliable. At the early attempts, the cable failed and when it was taken out for repairing it was found to be covered with living creatures, a fact which defied contemporary scientific opinion that there was no life in the deeper parts of the sea. Within a few years oceanography was under way. In 1872, Thomson led a scientific expedition (考察), which lasted for four years and brought home thousands of samples from the sea. Their classification and analysis occupied scientists for years and led to a five-volume report, the last volume being published in 1895.

单选题There was something {{U}}peculiar{{/U}} in the way he smiles. A. different B. strange C. wrong D. funny

单选题Charlie Chaplin Charlie Chaplin was born on April 16, 1889 in London. His father was an entertainer and although not one of the big names, he was doing very well. His mother Hannah was also an entertainer. While they were by no means rich, the music hall provided the Chaplins with a comfortable living. Unfortunately happy life didn't last long. Father's alcoholism was slowly, but surely destroying his marriage. Finally it ended in divorce. But Hannah was indomitable (不屈不挠的). Without her, Charlie Chaplin would have become just one more child lost in the poverty of Victorian London. Somehow she not only managed to keep Charlie and his brother Sydney clean and warm, clothed and fed, but she conjured (变戏法)little treats for them. She would sit at the window watching the passers-by and guess at their characters from the way they looked and behaved, spinning tales to delight Charlie and Syney. Charlie took in her skills and went on using them all his life. Charlie had always believed, even in the worst time, that he had some special potential inside him. He took his courage and went to see one of the top theatrical agents. With no experience at all,he was being offered the part of Billy, the pageboy (小听差) in a new production of "Sherlock Holmes". "Sherlock Holmes" opened on July 27, 1903 at the enormous "Pavilion Theatre". Charlie seemed to change overnight. It was as if he had found the thing he was meant to do. In 1910, when Kamo set off on its yearly American tour, Charlie was regarded as "one of the best pantomime (哑剧)artists ever seen here. " They had reached Philadelphia when a telegram arrived and he was being offered the chance to replace a star in the Keystone film company. Cinema was born in the same year as Charlie, though people still believed it was a passing fad (一时的狂热，时尚), and would never replace live shows. He was kept hanging about for several weeks and he used the time to watch and learn. He was determined to master this new medium. It offered him the chance of money and success and it would set him free from the unpredictability of live audience. Charlie's first film, released in February 1914, was called "Making a living". Though it didn't satisfy Charlie, the public liked it. After that he made ten films and he learned a lot. The public loved him and distributors were demanding more and more Chaplin films. In an incredibly short time, Charlie had become a very important man in motion picture.

单选题Do you fancy going to the {{U}}Public House{{/U}}?

单选题Can You Hear This? When something creates a sound wave in a room or an auditorium (礼堂) , listeners hear the sound wave directly from the source. They also hear the reflections as the sound bounces off the walls, floor, and ceiling. These are called the reflected wave or reverberant (反射的) sound, which can be heard even after the sound is no longer coming from the source. The reverberation time of an auditorium is determined by the volume or interior size of the auditorium. It is also determined by how well or how poorly the walls, ceiling, floor, and contents of the room (including the people) absorb sound. There is no ideal reverberation time, because each use of an auditorium calls for different reverberation. Speech needs to be understood clearly; therefore rooms used for talking must have a short reverberation time. The full-sound performance of music such as Wagner operas or Mahler symphonies should have a long reverberation time. The light, rapid musical passages of Bach or Mozart need a reverberation time somewhere between. Acoustic problems often are caused by poor auditorium design. Smooth, curved (弯曲的) reflecting surfaces create large reflections. Parallel (平行的) walls reflect sound back and forth, creating a rapid, repetitive pulsing (有节奏的跳动) effect. Large pillars (柱) and comers can cause acoustic shadows as the sound waves try to pass around the object. Some of these problems can be solved by using absorbers and reflectors to change the reverberation time of a room. For example, hanging large reflections, called clouds, over the performers will allow some sound frequencies to reflect and others to pass to achieve a pleasing mixture of sound.

单选题Jack was dismissed .

单选题Black Holes Most scientists agree that black holes exist but are nearly impossible to locate. A black hole in the universe is not a solid object, like a planet, but it is shaped like a sphere (球体). Astronomers (天文学家) think that at the center of a black hole there is a single point in space with infinite(无限的)density(稠密), This single point is called a singularity (奇点). If the singularity theory is correct, it means that when a massive star collapses, all the material in it disappears into the singularity. The center of a black hole would not really be a hole at all, but an infinitely dense point. Anything that crosses the black hole is pulled in by its great gravity. Although black holes do exist, they are difficult to observe. These are the reasons. · No light or anything else comes out of black holes. As a result, they are invisible to a telescope. · In astronomical terms, black holes are truly. For example, a black hole formed by the collapse of a giant star would have an event horizon(视界) only 18 miles across. · The nearest black holes would be dozens of light years away from Earth. One light year is about 6 trillion (万亿) miles. Even the most powerful telescopes could not pick out an object so small at such a great distance. In 1994 the Hubble Space Telescope provided evidence that black holes exist. There are still answers to be found, however, so black holes remain one of the mysteries of the universe.

单选题3 The boy is intelligent. A．clever B．naughty C．difficult D．active

单选题We were all there when the accident occurred.A. happenedB. brokeC. spreadD. appeared

单选题 下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。{{B}}第一篇{{/B}} {{B}} The Clock That Wakes You When You Are Ready{{/B}} Are you a real grump (脾气坏的人) in the mornings? Do you wake up every day feeling tired, angry and upset, and all too ready to hit the snooze (瞌睡) button? If so, then a new alarm clock could be just for you. The clock, called SleepSmart, measures your sleep cycle, and waits for you to be in your lightest phase of sleep before waking you up. Its makers say that should ensure you wake up feeling refreshed (恢复精力) every morning. As you sleep you pass through a sequence of sleep states - light sleep, deep sleep and REM sleep (快速眼动睡眠) - that repeats approximately every 90 minutes. The points in that cycle at which you wake can affect how you feel later, and may even have a greater impact than how long or little you have slept. Being wakened during a light phase means you are more likely to wake up cheerful and full of life and interest. SleepSmart records the distinct pattern of brain waves produced during each phase of sleep, via a headband equipped with electrodes (电极) and a microprocessor. This measures electric activity of the wearer's brain, and communicates wirelessly with a clock unit near the bed. You program the clock with the latest time at which you want to be wakened, and it then at the proper time wakes. you during the last light sleep phase before that. The concept was invented by a group of students at Brown University in Rhode Island after a friend complained of waking up tired and performing poorly on a test. "As sleep-deprived (剥夺) people ourselves, we started thinking of what to do about it," says Eric Shashoua, a recent college graduate and now chief executive officer of Axon Sleep Research Laboratories, a company created by the students to develop their idea. They have almost finished a prototype and plan to market the product by next year.

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。{{B}}第一篇{{/B}} {{B}}Disfigurement of Businessman{{/B}} In the relationship of education to business we observe today a fine state of paradox. On the one hand, the emphasis which most business places upon a college degree is so great that one can almost visualize the time when even the office boy will have his baccalaureate. On the other hand, we seem to preserve the belief that some deep intellectual chasm separates the businessman from other products of the university system. The notion that business people are quite the Philistines sounds absurd. For some reason, we tend to characterize vocations by stereotypes, none too flattering but nonetheless deeply imbedded in the national conscience. In the cast of characters the businessman comes on stage as a crass and uncouth person. It is not a pleasant conception and no more truthful or less unpleasant than our other stereotypes. Business is made up of people with all kinds of backgrounds, all kinds of motivations, and all kinds of tastes, just as in any other form of human endeavour. Businessmen are not ambulatory balance sheets and profit statements, but perfectly normal human beings, subject to whatever strengths, frailties, and limitations characterize man on the earth. They are people grouped together in organizations designed to complement the weakness of one with strength of another, tempering the exuberance of the young with the caution of the more mature, the poetic soarings of one mind with the counting house realism of another. Any disfigurement which society may suffer will come from man himself, not from the particular vocation to which he devotes his time. Any group of people necessarily represents an approach to a common denominator, and it is probably true that even individually they tend to conform somewhat to the general pattern. Many have pointed out the danger of engulfing our original thinkers in a tide of mediocrity. Conformity is not any more prevalent or any more exacting in the business field than it is in any other. It is a characteristic of all organizations of whatever nature. The fact is the large business unit provides greater opportunities for individuality and require less in the way of conformity than other institutions of comparable size—the government service, or the academic world, or certainly the military.

单选题Until recently, the industry has had little guidance in how to proceed with development without harming wildlife. Regulations are mostly imposed by states or local authorities, whose patchwork guidelines vary from stringent (严格的) to lax (不严格的, 松懈的). The wind Turbine Guidelines Advisory Committee-established in 2007 under the U. S. Fish and Wildlife Service, is proposing federal recommendations to reduce wind development's effect on wildlife. Composed of wind-industry members, wildlife officials, and federal authorities, the committee will present the recommendations to the secretary of the interior for review in October. The recommendations are voluntary, but according to David Stout of the U. S. Fish and Wildlife Service, the guidelines will be" unprecedented in terms of companies agreeing to hold themselves to a higher standard." Presently, most regulations on the wind industry are set up byA. the federal government.B. the Advisory Committee.C. U. S. Fish and Wildlife Service.D. states or local authorities.

单选题{{B}}第三篇{{/B}} {{B}}The Body Clock{{/B}} Why is it that flying to New York from London will leave you feeling less tired than flying to London from New York? The answer may be a clear case of biology not being able to keep up with technology. Deep inside the brain there is a "clock" that governs every aspect of the body's functioning: sleep and wake cycles, levels of alertness, performance, mood, hormone levels, digestion, body temperature and so on. It regulates all of these functions on a 24-hour basis and is called the biological clock. This body clock programmes us to be sleepy twice a day, between 3-5 am and again between 3-5 pm. Afternoon tea and nap are all cultural responses to our natural biological sleepiness in the afternoon. One of the major causes of the travellers' malady known as jet lag is the non-alignment of a person's internal body clock with clocks in the external world. Crossing different time zones confuses the biological clock, which then has to adjust to the new time and patterns of light and activity. To make matters more complex, not all internal body functions adjust at the same rate. So your sleep/wake may adjust to a new time zone at one rate, while your temperature adjusts at a different pace. Your digestion may be on a different schedule altogether. Though we live in a 24-hour day, the natural tendency of the body clock is to extend our day beyond 24 hours. It is contrary to our biological programming to "shrink" our day. That is why traveling in a westward direction is more body-clock friendly than flying east. NASA studies of long haul pilots showed that westward travel was associated with significantly better sleep quantity and quality than eastward flights. When flying west, you are "extending" your day, thus traveling in the natural direction of your internal clock. Flying eastward will involve "shrinking'" or reducing your day and is in direct opposition to your internal clock's natural tendency. One of the more common complaints of travelers is that their sleep becomes disrupted. There are many reasons for this: changing time zones and schedules, changing light and activity levels, trying to sleep when your body clock is programmed to be awake, disruption of the internal biological clock and working longer hours. It is often suggested that you adjust your watch as soon as you board a plane, supposedly to try to help you adjust to your destination's schedule as soon as you arrive. But it can take the body clock several days to several weeks to fully adjust to a new time zone. So, our body clock truly can "govern" us.

单选题He left the building before smoke was Uspotted/U coming up the stairs.

单选题The team usually wear shirts with red and white Uvertical/U stripes.

单选题According to the English legend, King Bladud lost his life because

单选题From the beginning, water has furnished man with a source of food and a highway to travel upon. The first civilizations arose where water was a dominant element in the environment, a challenge to man's ingenuity. The Egyptians invented the 365-day calendar in response to the Nile's annual flooding. The Babylonians, who were among the most famous law. makers in ancient times, invented laws regulating water usage. Water inspired the Chinese to build a 1,000-mile canal, a complex system, which, after nearly 2,500 years, remains still practically in use and still commands the astonishment of engineers. But the ancients never found complete solutions to their water problems. The Yellow River is also known as" China's Sorrow" ; it is so unpredictable and dangerous that in a single flood it has caused a million deaths. Hoods slowed the great civilization of the Indus River Valley, and inadequate drainage ruined much of its land. Today water dominates man as it always has done. Its presence continues to govern the location of his homes and cities; its violent variability call kill man or his herds or his crops; its routes links him to his fellows; its immense value may add to already dangerous political conflicts. There are many examples of this in our own time. The Indus River is most probably located inA. China.B. Egypt.C. Babylon.D. Indi