单选题The journalist used to drink Diet Coke and tuck in his shirts in order to keep trim.

单选题John is collaborating with Mary in writing an article.

单选题Apple trees need moisture in order to thrive.A. flowerB. flourishC. pollinateD. bend

单选题KidneyDiseaseandHeartDiseaseSpurEachOtherHeartsandkidneys:Ifone'sdiseased,betterkeepacloseeyeontheother.Surprisingnewresearchshowskidneydiseasesomehowspeedsupheartdiseasewellbeforeithasravagedthekidneys.Andperhapsnotsosurprising,doctorshavefinallyproventhatheartdiseasecantriggerkidneydestruction,too.Thework,fromtwostudiesinvolvingover50,000patients,promisestoboosteffortstodiagnosesimmeringkidneydiseaseearlier.Allittakesareurineandbloodteststhatcostlessthan$25,somethingproponentswanttobecomeasroutineascholesterolchecks."Theaveragepatientknowstheircholesterol,"saysDr.PeterMcCullough,preventivemedicinechiefatMichigan'sWilliamBeaumontHospital."Theaveragepatienthasnoideaoftheirkidneyfunction."Chronickidneydisease,orCKD,isaquietepidemic:Manyofthe19millionAmericansestimatedtohaveitdon'tknowtheydo.Thekidneyslosetheirabilitytofilterwasteoutofthebloodstreamsoslowlythatsymptomsaren'tobviousuntiltheorgansareverydamaged.End-stagekidneyfailureisrisingfast,with400,000peoplerequiringdialysisoratransplanttosurvive,atollthathasdoubledineachofthelasttwodecades.AndwhileCKDpatientsoftenareterrifiedofhavingtogoondialysis,thehardtruthisthatmostwilldieofheartdiseasebeforetheirkidneysdisintegratetothatpoint,somethingkidneyspecialistshaverecognizedforseveralyearsbutisn'twidelyknown.Indeed,thenewresearchishighlightedinthismonth'sArchivesofInternalMedicinewithacallfordoctorswhocareforheartpatientstostartrigorouslycheckingoutthekidneys,andforbettercareofearlykidneydiseaseThelinksoundslogical.Afterall,highbloodpressureanddiabetesarechiefriskfactorsforbothchronickidneydiseaseandheartattacks.Butthelinkgoesbeyondthoseriskfactors,stressesMcCullough:Oncethekidneysbegintofail,somethinginturnacceleratesheartdisease,notjustintheobviouslysickorveryold,butatwhathecalls"ashockinglyearlyage."McCulloughandcolleaguestrackedmorethan37,000relativelyyoungpeople—averageage53—whovolunteeredforakidneyscreening.Threemarkersofkidneyfunctionwerechecked:therateatwhichkidneysfilterblood,calledtheGFRorglomerularfiltrationrate;levelsoftheproteinalbuminintheurine;andiftheywereanemic.Theyalsowereaskedaboutpreviouslydiagnosedheartdisease.Theoddsofhavingheartdiseaserosesteadilyaseachofthekidneymarkersworsened.Morestrikingwasthedeathdata.Atthisage,fewdeathsareexpected,andindeedjust191peoplediedduringthestudyperiod.ButthosewhohadbothCKDandknownheartdiseasehadathreefoldincreasedriskofdeathinamereyears,mostlyfromheartproblems."Thisstudyisverymuchawake-upcall."McCulloughsays.

单选题The idea of test-tube babies may make you starry-eyed with delight at the wonders of modern medicine or bleary-eyed with considering the moral/legal implications of starting life in a laboratory. But if you've ever been pregnant(怀孕的)yourself, one thing is certain: You wonder what it's like to carry a test-tube baby. Are these pregnancies normal? Are the babies normal? The earliest answers come from Australia, where a group of medical experts at the Queen Victoria Medical Center in Melbourne have taken a look at the continent's first nine successful test-tube pregnancies. The Australians report that the pregnancies themselves seemed to proceed according to plan, but at birth some unusual trends did show up. Seven of the nine babies turned out to be girls. Six of the nine were delivered by Caesarean section(剖腹产术). And one baby, a twin, was born with a serious heart defect and a few days later developed life-threatening abdominal(腹剖的)problems. What does it all mean? Even the doctors don't know for sure, because the numbers are so small. The proportion of girls to boys is high, but until there are many more test-tube babies, no one will know whether that's pure coincidence(巧合)or something special. The same thing is true of the single heart defect; it usually shows up in only 15 out of 60,000 births in that part of Australia, but the fact that it occurred in one out of nine test-tube babies does not necessarily mean that they are at special risk. One thing the doctors can explain is the high number of Caesareans. The Australian researchers report that they are quite encouraged. All the babies are now making normal progress--even the twin with the birth defects.

单选题Tickets must be purchased two weeks in advance.A. bookedB. boughtC. soldD. obtained

单选题It's beyond {{U}}mortal{{/U}} power to bring a dead man back to life.

单选题Theories of teaching have not been as fully developed as have theories of learning.

单选题Drug Resistance Fades Quickly in Key Aids Drug One of the main weapons to prevent mother-to-child transmission of the AIDS virus during birth is the drug nevirapine. But when nevirapine is used alone just once, HIV starts becoming resistant to it. Research in Botswana shows that the resistance is not long lasting and that this affordable drug does not have to be abandoned forever by infected mothers who have already taken it. International medical guidelines call for pregnant women with advanced HIV to get a combination of AIDS drugs including nevirapine to prevent passing their infection on to their newborns during delivery. But in poor countries, combinations have been expensive and nevirapine has often been used alone, since studies have shown that a single dose can cut the transmission rate in half. The problem is that HIV resistance builds against it quickly when used alone just once because other drugs are not present to kill the virus particles that survive nevirapine. This renders the drug less effective in later combinations for treating women after their baby is born. But the new study from Botswana shows that nevirapine can make a comeback for these women if they wait until the resistance subsides. "The further out you get from that exposure to single dose nevirapine, the less detectable nevirapine resistance is," said Shahin Lockman of the Harvard School of Public Health in Boston. She says waiting period for women who get the single dose of nevirapine at delivery can be as short as six months. "If they started nevirapine-based treatment six or more months after nevirapine exposure, their treatment response was just as good, and really quite high, compared to women who did not have the single dose of nevirapine," she added. "However, the women who started nevirapine-based treatment within six months of that nevirapine exposure were much more likely to experience treatment failure." The study published in the New England Journal of Medicine shows that waiting at least six months means that HIV-positive women are 70 percent more likely to benefit from nevirapine-based drug combinations again than women who get them sooner. An official with the US government health agency that helped fund the study calls it very important. Iynne Mofenson is chief of research on child, adolescent, and maternal AIDS at the US National Institute of Child Health and Human Development. She says the finding supports a World Health Organization (WHO) recommendation restricting a single dose of nevirapine only to pregnant HIV-infected women who are healthy enough to wait six months after childbirth for more nevirapine-based therapy. Otherwise, they should get other drugs during labor. "It shows the importance of screening women for treatment while they are pregnant and putting them on appropriate therapy while they are pregnant to avoid having to start them too soon after they received preventive therapy," she explained. Shahin Lockman in Boston says the problem of nevirapine resistance should diminish now that more and more people are receiving combinations of AIDS drugs under expanded US and international programs to deliver them to Africa and other regions hard hit by the virus.

单选题Exercise Can Replace Insulin for Elderly Diabetics Most older people with so-called type II diabetes could stop taking insulin if they would do brisk exercise for 30 minutes just three times a week, according to new medical research results reported in the Copenhagen newspaper Berlingske Tidende on Monday. Results from tests conducted on diabetics at the Copenhagen Central Hospital Rigshospitalet's Center for Muscle Research showed that physical exercise can boost the body's ability to utilize insulin by 30 percent, the newspaper reported. This is equal tol the effect most elderly diabetics get from their insulin medication today, it said. Researchers had a group of non-diabetic men and a group of men with type It ,all more than 60 years of age, exercise on bicycles six times a week for three months. After the three months the doctors measured how much sugar the test subjects' muscles could utilize as a measure for howwell their insulin worked. Associate Professor Dr. Flemming Dela of the Muscle Research Center said the tests demonstrated that the exercising diabetics had just as high insulin utilization as the healthy on-exercising persons. "This means that the insulin works just as well for both groups. Physical exercise cannot cure people of diabetes, but it can eliminate almost all their symptoms. At the same time it can put off the point at which they have to begin taking insulin or perhaps completely avoid insulin treatment." Dela was quoted as saying. Insulin is a hormone produced by the pancreas, controlling sugar in the body and used against diabetes. Dela said that to achieve the desired effect diabetics need only exercise to the point where they begin to work up a sweat, but that the activity has to be maintained since it wears off after five days without sufficient exercise. Most diabetics realize that they have to watch their diet while remaining unaware of the importance of exercise, Dela added.

单选题Mary looked pale and weary .

单选题She alwaysU finds fault with /U everything．

单选题We have got to abide by the rules.

单选题 New US Plan for Disease Prevention Urging Americans to take responsibility for their health, Health and Human Services Secretary Tommy Thompson on Tuesday launched a $15 million program to try to encourage communities to do more to prevent chronic diseases like heart disease, cancer and diabetes (糖尿病)。 The initiative highlights the costs of chronic diseases—the leading causes of death in the United States—and outlines ways that people can prevent them, including better diet and increased exercise. "In the United States today, 7 of 10 deaths and the vast majority of serious illness, disability and health care costs are caused by chronic diseases," the Health and Human Services department said in a statement. The causes are often behavioral—smoking, poor eating habits and a lack of exercise. "I am convinced that preventing disease by promoting better health is a smart policy choice for our future." Thompson told a conference held to launch the initiative. "Our current health care system is not structured to deal with the rising costs of treating diseases that are largely preventable through changes in our lifestyle choices." Thompson said heart disease and strokes will cost the country more than $351 billion in 2003. "These leading causes of death for men and women are largely preventable, yet we as a nation are not taking the steps necessary for US to lead healthier, longer lives," he said. The $15 million is designed to go to communities to promote prevention, pushing for changes as simple as building sidewalks to encourage people to walk more. Daily exercise such as walking can prevent and even reverse heart disease and diabetes, and prevent cancer and strokes. The money will also go to community organizations, clinics and nutritionists who are being encouraged to work together to educate people at risk of diabetes about what they can do to prevent it and encourage more cancer screening. The American Cancer Society estimates that half of all cancers can be caught by screening, including Pap tests (巴氏试验) for cervical (子宫颈的) cancer mammograms (乳房X线照片) for breast cancer, colonoscopies (结肠镜检查), and prostate (前列腺的) checks. If such cancers were all caught by early screening, the group estimates that the survival rate for cancer would rise to 95 percent.

单选题All the cars are tested for {{U}}defects{{/U}} before leaving the factory. A. functions B. faults C. motions D. parts

单选题Efforts to preserve the peace have failed.

单选题She had to look after a house, a big garden and five dogs {{U}}into the bargain{{/U}}.

单选题What do you think is the author’s attitude toward TV expressed in the last two sentences?

单选题She had Ucome to terms with/U the fact that her husband would always be crippled.

单选题 阅读下面这篇短文，短文后列出了7个句子，请根据短文的内容对每个句子做出判断。 {{B}}Using HIV Virus to Cure Cancer{{/B}} Scientists are planning to use human immunodeficiency (免疫缺陷) virus (HIV), one of mankind's most feared viruses, as a carrier of genes which can fight cancer and a range of diseases that cannot be cured. The experts say HIV has an almost perfect ability to avoid the body's immune (免疫的) defenses, making it ideal for carrying replacement genes into patients' bodies, according to the Observer. A team at the California-based Salk Institute, one of the world's leading research centers on biological sciences, has created a special new breed of HIV and has started negotiations with the U.S. Food and Drug Administration (FDA) to begin clinical gene therapy (治疗) trials this year. The first trials are expected to involve patients suffering from cancers that cannot be cured by surgery although project leader Professor Inder Verma said the HIV technique would have "far wider applications". The plan remains very likely to cause controversy since it involves making use of a virus which has caused more than 22 million deaths around the world in the past two decades. Verma said that the idea of using HIV for a beneficial purpose was "shocking" but the fierce nature of HIV had disappeared by having all six of the potentially deadly genes removed. Illnesses such as various cancers are caused when a gene in a patient's body fails to work properly. In the past two years, breakthroughs in genetics (遗传学) have led gene therapy scientists to try and replace the genes that do not function normally. Unfortunately, the body's immune defenses have been known to attack the modified genes and make them lose their effects before they can start their task and progress in the field has been held up by the lack of a suitable carrier. The HIV virus has the ability to escape from, and then destroy, the immune defense cells designed to protect our bodies and this makes it attractive to scientists as a way of secretly conveying replacement genes into patients' bodies.