单选题I had some difficulty in carrying out the plan.

单选题Many doctors are still general practitioners, but the {{U}}tendency{{/U}} is toward specialization in medicine.

单选题Smoking is not permitted in the office.

单选题Many cities have restricted smoking in public places.

单选题The decision to invade provoked storms of protest.A. ignoredB. organizedC. causedD. received

单选题Can we resume the meeting?

单选题 What Is the Coolest Gas in the Universe? What is the coldest air temperature ever recorded on the earth? Where was this low temperature recorded? The coldest recorded temperature on Earth was -91℃, which {{U}} {{U}} 1 {{/U}} {{/U}}in Antarctica in 1983. We encounter an interesting situation when we discuss temperatures in {{U}} {{U}} 2 {{/U}} {{/U}}temperatures in Earth orbit actually range from about 20℃ to 120℃. The temperature depends upon {{U}} {{U}} 3 {{/U}} {{/U}}you are in direct sunlight or shade. Obviously, -120℃ is colder than our body can safely endure. Thank NASA science for well-designed space {{U}} {{U}} 4 {{/U}} {{/U}}that protect astronauts from these temperature extremes. The space temperatures just discussed affect only our areal of the solar {{U}} {{U}} 5 {{/U}} {{/U}}. Obviously, it is hotter closer to the sun and colder as we travel away from the sun. Astronomers estimate temperatures at Pluto are about -210℃. How cold is the lowest estimated temperature in the entire universe? Again, it depends upon your {{U}} {{U}} 6 {{/U}} {{/U}}. We are taught it is supposedly {{U}} {{U}} 7 {{/U}} {{/U}}to have a temperature below absolute zero, which is -273℃, at which atoms do not move. Two scientists, whose names are Cornell and Wieman, have successfully cooled down a gas to a temperature barely {{U}} {{U}} 8 {{/U}} {{/U}}absolute zero. They won the Nobel Prize in Physics in 2001 for their work—not a discovery, in this case. Why is the two scientists' work so important to science? In the 1920s, Satyendra Nath Bose was studying an interesting {{U}} {{U}} 9 {{/U}} {{/U}}about special light particles we now call photons. Bose had trouble {{U}} {{U}} 10 {{/U}} {{/U}}other scientists to believe his theory, {{U}} {{U}} 11 {{/U}} {{/U}}he contacted Albert Einstein. Einstein's calculations helped him theorize that atoms {{U}} {{U}} 12 {{/U}} {{/U}}behave as Bose thought—but only at very cold temperatures. Scientists have also discovered that {{U}} {{U}} 13 {{/U}} {{/U}}atoms can help them make the world's atomic docks even more accurate. These clocks are so accurate today they would only lose one second {{U}} {{U}} 14 {{/U}} {{/U}}six million years! Such accuracy will help us travel in space because distance is velocity times time (d=v×t). With the long distances involved in space {{U}} {{U}} 15 {{/U}} {{/U}}, we need to know time as accurately as possible to get accurate distance.

单选题Look After Your Voice Often speakers at a meeting experience dry mouths and ask for a glass of water. You can solve the problem by activating the saliva in you mouth. First gently bite the edges of your tongue with your teeth. Or, press your entire tongue to the bottom of your mouth and hold it there until the saliva flow. Or you can imagine that you are slicing a big juicy lemon and sucking the juice. Before you begin your talk, be kind to your voice. Avoid milk or creamy drinks which coat your throat. Keen your throat wet by drinking a little sweetened warm tea or diluted fruit juice. If you sense that you are losing your voice, stop talking completely. Save your voice for your speech. You may feel foolish using paper to write notes, but the best thing you can do is to rest your voice. If you need to see a doctor, perhaps you can get some advice from a professional singer. In the meantime, do not even talk in a low voice. What about drinking alcohol to wet your throat? I advice you not to touch alcohol before speaking. The problem with alcohol is that one drink gives you a little confidence. The second drink gives you even more confidence. Finally you will feel all-powerful and you will feel you can do everything, but in fact your brain and your mouth do not work together properly. Save the alcohol until you finish speaking. Perhaps you want to accept the advice, but you may wonder if you can ever change the habits of a lifetime. Of course you can. Goethe, who lived before indoor skating rinks or swimming pools, said, "We learn to skate in the summer and swim in the winter." Take this message to heart and give yourself time to develop your new habits. If you are willing to change, you will soon be able to say that you will never forget these techniques because they became a part of your body.

单选题It is difficult to get young people to plan for their old age, which seems very distant to them.

单选题The council meeting terminated at 2 o"clock.

单选题Sleepwalking Not all sleep is the same every night. We experience some deep, quiet sleep and some active sleep, which is when dreams happen. You might think sleepwalking would happen during active sleep, but a person isn"t physically active during active sleep. Sleepwalking usually happens in the first few hours of sleep in the stage called slow-wave or deep sleep. Not all sleepwalkers actually walk. Some simply sit up or stand in bed or act like they"re awake when in fact, they"re asleep! Most, however, do get up and move around for a few seconds or for as long as half an hour. Sleepwalkers" eyes are open, but they don"t see the same way they do when they"re awake and often think they"re in different rooms of the house or different places altogether. Sleepwalkers tend to go back to bed on their own and they won"t remember it in the morning. Researchers estimate that about 15% of kids sleepwalk regularly. Sleepwalking may run in families (在家族中世代相传) and sometimes occurs when a person is sick, has a fever, is not getting enough sleep, or is stressed (紧张) . If sleepwalking occurs frequently, every night or so, it"s a good idea for your morn or dad to take you to see your doctor. But occasional sleepwalking generally isn"t something to worry about, although it may look funny or even scary (骇人的) for the people who see a sleepwalker in action. Although occasional sleepwalking isn"t a big deal, it"s important, of course, that the person is kept safe. Precautions (预防措) should be taken so the person is less likely to fall down, run into something, or walk out the front door while sleepwalking.

单选题Her life is becoming more diverse .

单选题It is highly unlikely that she will arrive today.A. veryB. probablyC. hardlyD. possibly

单选题My father always takes a {{U}}stroll{{/U}} for a while after supper. A. walk B. rest C. bath D. breath

单选题What kind of animal has a greater ability to regenerate a lost part?

单选题{{B}}第二篇{{/B}} {{B}} Pushbike Peril{{/B}} Low speed bicycle crashes can badly injure—or even kill—children if they fall onto the ends of the handlebars (车把). So a team of engineers is redesigning the humble handlebar in a bid to make it safer. Kristy Arbogast, a bioengineer at the Children's Hospital of Philadelphia in Pennsylvania, began the project with her colleagues after a study of serious abdominal (腹部的) injuries in children in the past 30 years showed that more than a third were ca,used by bicycle accidents. "The task was to identify how the injuries occurred and come up with some countermeasures (对策)", she says. By interviewing the Children and their parents, Arbogast and her team were able to reconstruct (重建;重构) many of the accidents and identified a common mechanism responsible for serious injures. They discovered that most occur when children hit an obstacle at a slow speed, causing them to topple over. To maintain their balance they turn the handlebars, through 90 degrees — but their momentum (冲力) forces them into the end of the handlebars. The bike then falls over and the other end of the handlebars hits the ground, ramming it into their abdomen. The solution the group came up with is a handgrip(握柄) fitted with a spring and damping (制动的;减速的,缓冲的) system. The spring absorbs up to 50 percent of the forces transmitted through the handlebars in an impact. The group hopes to commercialize (使商品化) the device, which should add only a few dollars to the cost of a bike. "But our task has been one of education because up until now, bicycle manufacturer were unaware of the problem," says Arbogast. The team has also approached the US Consumer Product Safety Commission to try to persuade man-ufacturers to adopt the new design. A decision is expected later this year.

单选题He flew into a {{U}}fury{{/U}} when I said I couldn't help him any more.

单选题Freezing to Death for Beauty People in Beijing wear a lot of clothing during winter to fend (抵御) off the cold. In the United States, however, people wear 1 , partly because the car is the primary mode of transportation. Cars take 2 straight to their workplaces, which are heated well. The American diet is full of calories, so the 3 can afford to burn heat more quickly. Fewer layers of clothing give people the opportunity to stay 4 . Lots of Yale girls wear skirts 5 when it"s 10 degrees Centigrade (摄氏温度) outside. Some of them at least wear boots, tights, and leg-warmers. Some, however, really just go for the look 6 the risk of health. These girls have nothing to prevent their legs 7 the wind, and no socks to protect their feet. A mini skirt and a pair of stilettos (高跟鞋) are all that they wear. Typically, the ones pursuing fashion are 8 with little body fat. Just by the nature of their bodies, they are already at a disadvantage compared with normal people in 9 weather. I have always 10 , whenever I pass these girls, how they manage to refrain from shivering and just smile like spring had arrived. And then there are the guys. The girls can be said to 11 health for beauty. But why do guys 12 so little? It is not like, once they shed (脱掉) some layers, they suddenly become better-looking. They are not exactly being fashionable when they 13 wear sporty (花哨的) shorts and shower slippers in the midst of winter. It"s not cute. Of course, people have the freedom to look whatever 14 they want. I am just surprised that, given the vast difference between winter and summer temperatures in Connecticut, they can still 15 like they are partying on the beach in the middle of February.

单选题A Sound Sleep for Good Memory Before a big exam, a sound night"s sleep will do you more good than poring over text-books. That, at least, is the folk wisdom. And science, in the form of behavioral psychology, supports that wisdom. But such behavioral studies cannot distinguish between two competing theories of why sleep is good for the memory. One says that sleep is when permanent memories form. The other says that they are actually formed during the day, but then "edited" at night, to flush away what is superfluous. To tell the difference, it is necessary to look into the brain of a sleeping person, and that is hard. But after a decade of painstaking work, a team led by Pierre Maquet at Liege University in Belgian has managed to do it. The particular stage of sleep in which the Belgian group is interested in is rapid eye movement (REM) sleep, when brain and body are active, heart rate and blood pressure increase, the eyes move back and forth behind the eyelids as if watching a movie, and brainwave traces resemble those of wakefulness. It is during this period of sleep that people are most likely to relive events of the previous day in dreams. Dr. Maquet used an electronic device called PET to study the brains of people as they practiced a task during the day, and as they slept during the following night. The task required them to press a button as fast as possible, in response to a light coming on in one of six positions. As they learnt how to do this, their response times got faster. What they did not know was that the appearance of the lights sometimes followed a pattern—what is referred to as "artificial grammar". Yet the reductions in response time showed that they learnt faster when the pattern was present than when there was not. What is more, those with more to learn (i.e., the "grammar", as well as the mechanical task of pushing the button) have more active brains. The "editing" theory would not predict that, since the number of irrelevant stimuli would be the same in each case. And to eliminate any doubts that the experimental subjects were learning as opposed to unlearning, their response times when they woke up were even quicker than when they went to sleep. The team, therefore, concluded that the nerve connections involved in memory are reinforced through reactivation during REM sleep, particularly if the brain detects an inherent structure in the material being learnt. So now, on the eve of that crucial test, maths students can sleep soundly in the knowledge that what they will remember the next day are the basic rules of algebra and not the incoherent talk from the radio next door.

单选题Saving Money Where you save your money often depends on what you are saving for. If you are saving to buy a CD (光盘) or to go to a concert, then probably you would keep your money somewhere in your room. If you are saving for a big purchase like a mountain bike or a schooltrip, where would you save your money? One place to save money is the bank. Putting your money in a savings account will help your money earn more money, If you put your money in a piggy bank (猪形储蓄罐), one year later you"ll still have the same amount of money you put in. If you put your money in a savings account, one year later, you"ll have more money than you put in. Why? When you keep your money in a bank, your money earns interest. Interest is an amount of money a bank pays you to use your money. The bank uses your money (and the money of other people, too) to loan money to people and businesses. The bank will send you a statement several times a year. A bank statement tells you how much money you have in your account. It also tells you how much interest you have earned. If you leave your money in the bank, you can watch it grow! Another way you can save money is to buy a certificate of deposit or CD. If you have some money that you don"t need to use for a long time, this is a good way to make your money grow. You can buy a CD at a bank. You agree not to use the money for a certain period of time. That period might be from six months to five years. You can"t touch your money during that time. If you do, you must pay a penalty, or fee.