单选题WhatwasMichaelGeisenbeforebeingascienceteacher?A.Ascientist.B.Aforester.C.Aschoolmaster.D.Afarmer.

单选题Schools are advised to work together with parents to address the issue of addiction to computer games. A. speak to B. deal with C. take down D. go for

单选题The visit of Japanese Prime Minister Shinzo Abe to the Yasukuni shrine {{U}}outraged{{/U}} China and South Korea. A. angered B. condoled C. bewildered D. imposed

单选题If those "mad moments"-- when you can't recall what your friend has told you or where you left your keys--are becoming more frequent, mental exercises and a healthy brain diet may help. Just as bodies require more maintenance with the passing years, so do brains, which scientists now know- show signs of aging as early as the 20s and 30s. "'Brain aging starts at a very young age, younger than any of us have imagined and these processes continue gradually over the years," said Dr. Gary Small, the director of the Center on Aging at the University of California, Los Angeles. "I'm convinced that it is never too early to get started on a mental or brain-fitness program," he added. In his book, "The Memory Bible," the 51-year-old neuroscientist lists what he refers to as the 10 commandments for keeping the brain young. They include training memory, building skills, minimizing stress, mental exercises, brain food and a healthy lifestyle. It's a game plan for keeping brain Cells sparking and neural networks in tip-top shape. "Misplacing your keys a couple of times doesn't mean you should start labeling your cabinets. Memory loss is not an inevitable consequence of aging. Our brains can fight back," he said. Small provides the weapons for a full-scale attack. According to him, simple memory tests give an indication of what you are up against and tools such as look, snap and connect are designed to make sure that important things such as names and dates are never forgotten. "So if you want to learn names and faces, for example, you meet Mrs. Beatty and you notice a distinguishing facial feature, maybe a prominent eyebrow," said Small. "You associate the first thing that comes to mind. I think of the actor Warren Beatty so I create a mental snapshot of Warren Beatty kissing her brow." Small admits it may sound a bit strange but he says it works. "Mental exercises could be anything from doing crossword puzzles and writing with your left hand if you are right handed or learning a language. It could be anything that is fun that people enjoy doing", he added. He also recommends physical exercise, a low-fat diet and eating foods rich in omega-3 fatty acids, such as fish, walnuts and Brazil nuts, and fruits and vegetables high in antioxidants (抗氧化剂) including blueberries and onions in addition to reducing stress.

单选题He preferred to write the letter by hand______. A. to typing it B. than type it C. to type it D. rather than type it

单选题Passage One From the goose that laid the golden egg to the race between the tortoise and the hare, Aesop's fables are known for teaching moral lessons rather than literally being true. But a new study says at least one such tale might really have happened. It's the fable about a thirsty crow. The bird comes across a jar with the water level too low for him to reach. The crow raises the water level by dropping stones into the jar. The moral tells: Little by little does the trick, or in other retellings, necessity is the mother of invention. Now, scientists report that some relatives of crows called rooks used the same stone-dropping strategy to get at a floating worm. Results of experiments with three birds were published online by the journal Current Biology. Rooks, like crows, had already been shown to use tools in previous experiments. Christopher Bird of Cambridge University and a colleague exposed the rooks to a 6-inch-tall clear plastic tube containing water, with a worm on its surface. The birds used the stone-dropping trick spontaneously and appeared to estimate how many stones they would need. They learned quickly that larger stones work better. In an accompanying commentary, Alex Taylor and Russell Gray of the University of Auckland in New Zealand noted that in an earlier experiment, the same birds had dropped a single stone into a tube to get food released at the bottom. So maybe they were just following that strategy again when they saw the tube in the new experiment, the scientists suggested. But Bird's paper argued there's more to it: The rooks dropped multiple stones rather than just one before reaching for the worm, and they reached for it at the top of the tube rather than trying to reach the food at the bottom. The researchers also said Aesop's crow might have actually been a rook, since both kinds of birds were called crows in the past.

单选题 Once upon a time， staying a healthy weight was easy. To lose weight you simply had to practise the reverse of home economics-spend more than you earned. Unfortunately for many, but perhaps not surprisingly, {{U}}it turns out that{{/U}} {{U}}eople are rather more complicated than bank accounts{{/U}}. To stay a healthy weight, you need a hormone called leptin to work properly. It sends "I'm full" messages from the fat cells up to the brain，where they go, among other places, to the same pleasure centers that respond tO drugs like cocaine. Obese people produce plenty of leptin, but the brain doesn't seem to respond to it properly. Last year, researchers at the Oregon Research Institute scanned the brains of overweight people and found their reward circuits were underactive. They were eating more to try to get the enjoyment they were missing. There's a lot of evidence for the fact that most, if not all, of us have a set point around which our weight can vary by about seven to nine kilos, but anything beyond that is a real struggle. Making changes is hard, particularly if your body is working against you. So why not ditch the traditional approaches and try some new methods, based on the latest research, that work with your body rather than against it. Several years ago researchers at the National Institute on Aging in Baltimore reported that when they gave rats very little food one day and allowed them to eat plenty the next, they showed virtually all the benefits of a permanent calorie restriction diet. The same goes for humans, according to Dr.James Johnson. How does it work?Besides forcing the body to burn fat, it may also trigger hormonal changes. Most people say that the diet takes a bit of getting used to, but is not as {{U}}grindng{{/U}} as trying tO cut back on an everyday basis. Older dieters may remember something called brown fat. Unlike the undesirable white stuff, this was a dieter's dream. Instead of storing excess energy as fat, brown-fat tissue burned it off to keep you warm—at least in mice. Brown fat fell out of favor because researchers couldn't find much in humans but now, thanks to the New England Journal of Medicine, it's back in fashion. The idea is to expose people to cold temperatures. They then make more brown fat and their weight drops.

单选题The heavy earthquake occurred in the afternoon, causing an {{U}}inconceivable{{/U}} damage. A. unnecessary B. unreasonable C. unavoidable D. unbelievable

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单选题As in the rest of the continent, South Africa still has to {{U}}contend with{{/U}} overwhelming poverty. A. suffer from B. bring about C. invest in D. fight against

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单选题One way to maintain social stability is to {{U}}crack down{{/U}} on crime while creating more jobs. A. clamp down on B. settle down to C. look down upon D. boil down to

单选题This young lawyer dares to take on the powerful on behalf of the poor and weak. A. with the favor of B. find good jobs for C. assume the responsibility for D. accept the challenge of

单选题The difficulties facing these hikers {{U}}stem from{{/U}} the bad weather they have been having. A. cling to B. arise from C. result in D. compensate for

单选题Novel drugs developed through biotechnologies can be expected to {{U}}deliver{{/U}} a better effect. A. distribute B. produce C. liberate D. express

单选题On Christmas Eve in America the shopping malls are {{U}}saturated{{/U}} with shoppers in a frantic competition for last minute gifts. A. bustled B. soared C. filled D. broadened

单选题The massacre of innocent people cannot ever be {{U}}condoned{{/U}}. A. overlooked B. praise C. condemned D. satisfied

单选题This honor recognizes the work done by these private enterprises on behalf of charity. A. in the face of B. in the process of C. in the course of D. in the interests of

单选题Students of English are advised to try to ______ the meaning of a new word from the context. A. turn out B. figure out C. look out D. put out

单选题 Passage Three "I smoke for my health," I proclaimed in a newspaper article published in 1979. Since I am a doctor, this advice attracted amused attention. I reasoned that smoking made me cough and thus prevented pneumonia; smoking made my heart go faster and eliminated the need for special exercise; smoking restrained my appetite and kept me trim. And then, at 51, I had a heart attack. I knew the risk factors for early heart disease, high blood-cholesterol levels and smoking. The first four were in my favor, but 1; chose to smoke. Strange how the evidence that linked smoking to heart disease appeared unclear to me, and how the same data now appear overwhelmingly convincing. Why stop now? Smokers who stop after their first heart attack have an 80-percent chance of living ten more years—if they don't, a 60-per cent chance. As a smoker, I always resented the fact that we smokers received only scorn from nonsmokers. How could nonsmokers know that smoking was bad for the health if there were no smokers to prove it? Being a member of the experimental group, rather than the control group, deserves a certain measure of social appreciation. I've done my time. I'm now ready to be a control. No longer smoke for my health. My health can't stand the help. Will I miss the late-night trips to find a store that's still open and selling cigarettes? Will I miss searching through ashtrays (烟灰缸) to find the longest butt that is still smokable? Only time will tell. Not smoking may give me the time to find out. Was it easy to stop? Sure. Here is all you have to do. First, experience a severe crushing pain under your breastbone as you finish a cigarette. Next, have yourself admitted to a coronary-care(心脏康复) unit and be stripped of your clothing and belongings. Finally, remain in the unit at ad-solute bed rest for four days while smoking is forbidden. This broke my had-it. See if it works for you.