单选题He impressed all his colleagues as a vigorous man in the prime of his career.

单选题Alexander is the first patient at the newly opened RESTART, a video - game and Internet addiction recovery program in Fall City, Wash. , about 30 miles east of Seattle. It's hard to imagine Alexander, now merrily giving a tour of the woodsy facility, glued to a computer game for more than 16 hours a day, but he says, "It was pretty much all I was doing when 1 was in college. " Where is RESTART located?A. In WashingtonD. CB. In Fall CityC. In SeattleD. In Manhattan.

单选题Don"t omit this paragraph when you write your report.

单选题The town is famous for its magnificent buildings

单选题Please be careful when you are drinking coffee in case you smudge the new carpet.

单选题His claims seem credible to many people. A. workable B. convincing C. practical D. reliable

单选题Is Your Child's Stomach Pain All in His Head? We all know there are times that kids seem to complain (51) a stomach ache to get out of chores or going to school. Don't be so sure that the pain they (52) is all in their minds. We're learning more now about a condition (53) "functional abdominal pain" that is experienced by millions of kids every day. Like many teenagers, Kyle Brust makes it a point to do his homework: as (54) as he gets home. Unlike most, Kyle often did his with a terrible stomach ache. In fact, the (55) often started while he was at school, but getting help there was getting harder. "Some of my teachers wouldn't let me go, because I'd asked so many times before and they thought I was trying to get out of (56) ." says Kyle. Kyle's mom Marilyn says she couldn't blame the (57) . After all, she'd taken him to the doctor several times herself, and even they couldn't find anything (58) . "You know, you're running the tests and nothing's coming up. So, is it in his head, is he just an extremely stressful child? It's just frustrating (59) we're not finding any answers. " says Marilyn. It turns out Kyle was suffering from a condition known (60) functional abdominal pain, that affects as many as one out of every ten kids in this country. Even (61) the cause of the pain may not be obvious, there are real consequences. "It really does hurt, and these kids really do suffer. " says Dr. Campo, MD at Nationwide Children's Hospital. To help (62) , Campo is looking into a new approach. He's conducting clinical trials of an antidepressant that changes the way the body handles a chemical called serotonin. In a preliminary study, Dr. Campo found that in about eight out of ten (63) , the drug normally used to treat emotional pain worked to ease the pain in the (64) . "We think about it as being important in anxiety and depression and that's all quite true, but what's really interesting is that 95% of our body's serotonin is in our gut. " says Campo. Campo believes these kids have extremely sensitive intestines, and controlling the effects of serotonin may (65) ease the pain. It seemed to .work for Kyle, who is now completely pain free for the first time in years.

单选题 The prospects for treating cystic fibrosis by gene therapy are looking brighter following successful tests with a safer type of "shuttle"(短程梭运输工具)for ferrying(运送) replacement genes into a patient's lungs. During the tests, a British-led research team inserted healthy copies of the cystic fibrosis(囊性纤维变性) gene into cells lining sufferers' noses with the aid of microscopic droplets(水滴,飞沫) of fat called liposomes Other groups that have attempted to correct the genetic defect that causes cystic fibrosis have used viruses as "vectors" (媒介) to carry the healthy gene into target cells. Unfortunately, viruses can also cause inflammation in the lungs, an undesirable side effect in CF patients, whose lungs are already diseased. The new method for introducing corrective genes into the lungs of CF patients promises to be much safer. Cystic fibrosis is caused by defects in a gene called CFTR, which plays a part in the transport of chloride ions(离子) out of the cells lining the lungs, airways and gut. Defects in this gene mean that patients have difficulty expelling mucus(黏液) and inhaled (吸入) microorganisms from their lungs. As a result, they are very susceptible to lung infections, and usually die at around 30 years old. As an alternative to the viral vector, the researchers, linked loops (环)of DNA containing healthy copied of the CFTR gene to microscopic liposomes. When the liposomes come in contact with a cell, they fuse(融合) with its outer membrane, and release the DNA into the cell's interior. To test the system, the team sprayed the liposomes into the noses of volunteers with cystic fibrosis. "The cells lining the nose are very similar to those lining the lung," explains David Porteous of the human genetics group in Edinburgh. But the ceils in the nose are easier to monitor, and the risks are lower if any nasal (鼻的)cells are damaged. In the event(结果,到头来), none of the volunteers suffered any unpleasant side effects. And a single spraying partially corrected the cystic fibrosis defect. The researchers assessed the effectiveness of the treatment by measuring the voltage(电压,伏特) across the layer of cells lining the nose. This voltage is higher in cystic fibrosis sufferers than in healthy people. A single spraying reduced this difference by around 20 per cent. The re-searchers reported that the effect lasted for up to a week. The British researchers have yet to test their spray in the lungs, but are confident that the liposomes will not cause inflammation. The question, however, is how effective the shuttle system is. In the nose, the researchers had to add more copies of the healthy CFTR gene to match the performance of the adenovirus. This is because adenoviruses carry genes directly to the cell' s nucleus, ensuring that the instructions they carry are read. Genes carried by liposomes are only guaranteed a ride into the cell's cytoplasm, and fewer will find their way to the nucleus. Many will be broken down by the cell's waste disposal system before they get there. Bob Williamson, who heads the group at St. Mary's Hospital, says this will require much more efficient vectors. "People in 10 to 15 years will laugh at the crudity of the liposomes and viruses that we're using today, " he says. The aim is to make customized vectors which combine the best aspects of both systems, and include other genetic sequences to ensure that the information carried by the healthy CFTR gene is used by the target cells lining the lungs.

单选题Things will be different if you make a Usound/U choice.

单选题U.S. States Do Poorly in Women"s Health Not a single U. S. state meets basic federal goals for women"s health, and the nation as a whole fails except in two areas—mammograms and dental check-ups—researchers said on Thursday. Millions of women lack health insurance, and states make it difficult to enroll in Medicaid, the state-federal health insurance plan for the poor, according to the report. And few states are doing anywhere near enough to help women quit smoking the leading cause of death in the United States. "The nation as a whole and the individual states fall short of meeting national goals," reads the report. Put together by the National Women"s Law Center and the Oregon Health Science University, "These health goals provide a road map for assessing the status of women"s health." Of 27 measures examined by the group, from screening for diseases to actually treating them, the nation passes on only two, the researchers said. "The nation is so far from the healthy people goals that it receives an overall grade of "unsatisfactory"," they wrote. The problem seems to be a lack among states of an overall plan for health in general, the NWLC said. "State policy makers" piecemeal approach to our health care crisis has resulted in a complex and ineffective system that fails to meet the health care needs of women," Judy Waxman, NWLC Vice President for Health, said in a statement. "Lawmakers need to take a comprehensive, long-term approach to meeting women"s health needs and tackle this serious problem that plagues so many families."

单选题Formulated in 1823, the Monroe Doctrine asserted that the Americas were no longer open to European colonization. A. stated firmly B. argued light-mindedly C. thought seriously D. announced regrettably

单选题She could fix machine without referring to the instructions.A. observingB. learningC. consultingD. understanding

单选题 Late-night Drinking Coffee lovers beware. Having a quick "pick-me-up" cup of coffee1 late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin, the brain hormone that sends people into a sleep. Melatonin levels normally start to rise about two hours before bedtime. Levels then peak between 2 a.m. and 4 a. m. , before falling again. "It's the neurohormone that controls our sleep and tells our body when to sleep and when to wake," says Maurice Ohayon of the Stanford Sleep Epidemiology Research Center at Stanford University in California. But researchers in Israel have found that caffeinated coffee halves the body's levels of this sleep hormone. Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six volunteers slept less well after a cup of caffeinated coffee than after drinking the same amount of decal. On average, subjects slept 336 minutes per night after drinking caffeinated coffee, compared with 415 minutes after decal. They also took half an hour to drop off-twice as long as usual-and jigged around in bed twice as much. In the second phase of the experiment, the researchers wolfe the volunteers every three hours and asked them to give a urine sample. Shilo measured concentrations of a breakdown product of melatonin. The results suggest that melatonin concentrations in caffeine drinkers were half those in decal drinkers. In a paper accepted for publication in Sleep Medicinc, the researchers suggest that caffeine blocks production of the enzyme that drives melatonin production. Because it can take many hours to eliminate caffeine from the body, Ohayon recommends that coffee lovers switch to decal after lunch.

单选题Which of the following words can best describe her life in the old people's home?

单选题He often {{U}}finds fault with{{/U}} my work. A. criticizes B. praises C. evaluates D. talks about

单选题Smart Window Windows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with being a cutting edge technology. Researchers are now working on new technologies that enable a window to quickly change from clear to dark and anywhere in between with a flip of a switch. "It took us a long time to figure out what a window really is," says Claes Granqvist. He's a professor of solid-state physics at Uppsala University in Sweden. "It's contact with the outside world. You have to have visual contact with the surrounding world to feel well." So, windows and natural light are important for improving the way people feel when they're stuck indoors. Yet, windows are the weak link in a building when it comes to energy and temperature control. In the winter, cold air leaks in. When it's hot and sunny, sunlight streams in. All of this sunlight carries lots of heat and energy. And all of this extra heat forces people to turn on their air conditioners. Producing blasts of cold air, which can feel so refreshing, actually suck up enormous amounts of electricity in buildings around the world. Windows have been a major focus of energy research for a long time. Over the years, scientists have come up with a variety of strategies for coating, glazing, and layering windows to make them more energy efficient. Smart windows go a step further. They use chromogenic technologies which involve changes of color. electro chromic windows use electricity to change color. For example, a sheet of glass coated with thin layers of chemical compound such as tungsten oxide works a bit like a battery. Tungsten oxide is clear when an electric charge is applied and dark when the charge is removed, that is, when the amount of voltage is decreased, the window darkens until it's completely dark after all electricity is taken away. So applying a voltage determines whether the window looks clear or dark. One important feature that makes a smart window so smart is that it has a sort of "memory." All it takes is a small jolt of voltage to turn the window from one state to the other. Then, it stays that way. Transitions take anywhere from 10 seconds to a few minutes, depending on the size of the window. The development of smart windows could mean that massive air conditioning systems may no longer need. "In the future," Granqvist says, "our buildings may look different.

单选题Reingold and other epidemiologists don't discount hand--washing as an important tool in public health: there is plenty of evidence that it prevents other nasty bugs, including the common cold, many respiratory (呼吸道的) infections, and viruses that cause diarrhea (腹泻). But Reingold is bothered by the lack of science supporting the CDC's message, and he worries that the emphasis on a simple measure like hand -washing creates a false sense of security from H1N1 and tamps down the discussion of more difficult preventive measures. He said as much in an e - mail to the CDC this May. "I wouldn't care so much that we might be getting folks to improve hand - washing... with what is likely to be incorrect information about its ability to prevent influenza" if the media and the court of public opinion weren't so quick to embrace it as the only solution at the expense of things like surgical masks, wrote Reingold in his letter to the CDC. While Reingold admits he doesn't know if masks would reduce transmission of the virus, he hypothesizes that they're more likely to be helpful containing exposure to the airborne virus than hand -washing, and should not be so easily discounted. (Other experts are skeptical of face masks because it's difficult to ensure proper use, or that people will wear them in the first place. ) Hand -washing can prevent some nasty bugs, but not includingA. the comnlon cold.B. respiratory infections.C. viruses causing diarrhea.D. HI N1 viruses.

单选题These are their motives for doing it.A. reasonsB. excusesC. answersD. plans

单选题The man {{U}}set upon{{/U}} by a wolf in the forest.