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The dentist has decided to take out the girl's bad tooth.
A:.dig
B:draw
C:pull
D:extract
B:draw
C:pull
D:extract
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参考解析
解析：题干意为“牙医准备把这个女孩的坏牙拔出来。” 句中划线词意为“取出；带出”。D项extract意为“取出；抽出”。例句：The nuts are crushed to extract the oil from them．胡桃压碎后就能取油。A项意为“挖”。B项意为“抽；取”。C项意为“拉”。故选D。
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Swine Flu in New YorkThe Centers for Disease Control and Prevention(CDC)has confirmed cases of swine（猪）_______(51)in eight students at a New York preparatory（预科的）school, Mayor Michael Bloomberg said on Sunday. The students have had only_________(52) symptoms and none have been hospitalized,he said.Some of thestudents have already recovered.More than 100 students were absent from_______(53)due to flu-like symptoms last week.New Yorkhealth officials tested samples for eight students on Saturday and determined the students were probably________(54)from swine flu,and the CDC confirmed the________(55)on Sunday,Bloombergsaid.The announcement brings the ______(56) of confirmed swine flu eases in the United States to 20.Bloomberg said there is no ________(57)of a citywide outbreak( ~K) of the flu,and no sign of a potentialouthreak of swine fiu at ___________( 58) schools.Some students at the school_________(59) spring break in Mexico,Bloomberg gaid,bur authorities havenot determined _______( 60) any of the students with a confirmed ease of swine flu was in Mexico. Someonewho traveled to Mexico may not have had any flu symptoms but________(61) on the flu to someone else,henoted.Bloomberg called on students who are homesick to________(62) home for 48 hours after theirsymptoms go away.If symptoms are normal for a regular kind offlu ， there is________(63) need to go to a hospital,saidBloomberg. If symptoms become severe, as__________(64) any illness,people should go to the hospital,hesaid.St. Francis,which has 2,700 students,announced it will remam closed for two days.________(65)whether the students' illnesses have been minor because they're young and healthy or because it is a minor strain（菌株）of the virus,Bloomberg responded,"We don't know."_________(64)A:uponB:withC:alongD:down
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Clinical Trials1 Many clinical trials are done to see if a new drug or device is safe and effective for people to use .Sometimes clinical trials are used to study different ways to use the standard treatments so they will be more effective,easier to use,and/or decrease side effects. Sometimes,studies are done to learn how to best use the treatment in a different group, such as children,in whom the treatment was not previously tested.2 It is important to test drugs and medical products in the people they are meant to help,It is also important to conduct research in a variety of people because different people mayrespond differently to treatments.Some people participate in clinical trials because they have exhausted standard treatment options.Other people participate in trials because they want to contribute to the advancement of medical knowledge.3 The FDA（食品及药物管理局）works to protect participants in clinical trials and to ensure that people have reliable information as they decide whether to join a clinical trial. Although efforts are made to control the risks to clinical trial participants,some risks may be unavoidable because of the uncertainty inherent（内在的）in medical research studies involving new medical treatments.4 People should learn as much as possible about the clinical trials that interest them.They should also feel comfortable discussing their questions and concerns with members of thehealth care team. Prospective（预期的）participants should understand what happens during the trial,the type of health care they will receive,and any costs to them.Anyone considering a clinical trial should also know that there are benefits and risks associated with participating. Reliable information should be available to_________.A: for some patientsB: before participationC: in humansD:medical knowledgeE: during the trialF: candidates for clinical trials
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The Development of BalletBallet is a dance form that has a long history. The fact that it survives to this day shows that it has adjusted as times have changed.Ballet began in the royal courts during the Renaissance. At that time it became common for kings and queens, as well as other nobility（贵族）,to participate in pageants that included music,poetry,and dance. As these entertainments moved from the Italian courts to the French ones,court ladies began participating in them. Though their long dresses prevented much movement , they were able to perform elaborate（复杂的）walking patterns. It was not until the 1600s that women dancers shortened their skirts,changed to flat shoes,and began doing some of the leaps and turns performed by men.It was also in the 1600s that professional ballet began. King Louis XIV of France,himself a devoted dancer,founded the Royal Academy of Dance. The five basic feet positions from which all ballet steps begin were finalized. In the late 1700s another important change occurred. Ballet began to tell a story on its own. It was no longer simply dance to be performed between acts of plays. Elaborate wigs（假发）and costumes were eliminated. By the early 1800s dancers learned to rise on their toes to make it appear that they were floating.Classical ballet as we know it today was influenced primarily by Russian dancing. The Russians remained interested in ballet when it declined in other European countries in the mid-1800s.One of the most influential figures of the early 20th century was Sergei Diaghilev.His dance company,the Ballets Russes,brought a new energy and excitement to ballet. One of his chief assistants,George Balanchine,went on to found the New York City Ballet in 1948 and to influence new generations of dancers.The word“pageants”in Paragraph 2 means______.A:.dancesB: big showsC: instructionD: royal courts
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Prolonging Human LifeProlonging human life has increased the size of the human population. Many people alivetoday would have died of childhood diseases if they had been born 100 years ago.Becausemore people live longer,there are more people around at any given time. In fact,it is a decrease in death rates,not an increase in birthrates,that has led to the population explosion.Prolonging human life has also increased the dependency load. In all societies,people who are disabled or too young or too old to work are dependent on the rest of society to provide for them. In hunting and gathering cultures,old people who could not keep up might be left behind to die. In times of famine,infants might be allowed to die because they could not survive if their parents starved,whereas if the parents survived they could have another child. In most contemporary societies,people feel a moral obligation to keep people alive whether they can work or not. We have a great many people today who live past the age at which they want to work or are able to work;we also have rules which require people to retire at a certain age. Unless these people were able to save money for their retirement,some-body else must support them. In the United States many retired people live on social security checks which are so little that they must live in near poverty. Older people have more illness than young or middle-aged people;unless they have wealth or private or government insur-ance,they must often“go on welfare” if they have a serious illness.When older people become senile or too weak and ill to care for themselves,they create grave problems for their families. In the past and in some traditional cultures,they would be cared for at home until they died. Today,with most members of a household working or in school,there is often no one at home who can care for a sick or weak person. To meet this need,a great many nursing homes and convalescent hospitals have been built.These are of-ten profit-making organizations,although some are sponsored by religious and other nonprofit groups.While a few of these institutions are good,most of them are simply“dumping grounds”for the dying in which“care”is given by poorly paid,overworked,and under-skilled personnel.The writer believes that the population explosion results from______.A: an increase in birthratesB: the industrial developmentC: a decrease in death ratesD: cultural advances
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Smoking will be banned in all public places here.A:forbidden
B:allowed
C:permitted
D:promoted
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第一篇A meager（不足的）diet may give you health and long life, but it's not much fun一and it might not even be necessary. We may be able to hang on to most of that youthful（有青春活力的）vigor （精力）even if we don't start to diet until old age.Stephen Spindler and his colleagues from the University of California at Riverside have found that some of an elderly mouse's liver genes can be made to behave as they did when the mouse was young simply by limiting its food for four weeks. The genetic rejuvenation（恢复活力，返老还童） won't reverse other damage caused by time for the mouse,but could help its liver metabolize（使进入新陈代谢过程）drugs or get rid of toxins.Spindler's team fed three mice a normal diet for their whole lives,and fed another three on half-rations.Three more mice were switched from the normal diet to half-feed for a month when they were 34 months old一equivalent to about 70 human years.The researchers checked the activity of 11,000 genes from the mouse livers,and found that 46 changed with age in the normally fed mice.The changes were associated with things like inflammation and free radical production一probably bad news for mouse health.In the mice that had dieted all their lives,27 of those 46 genes continued to behave like young genes.But the most surprising finding was that the mice that only started dieting in old age also benefited from 70 percent of these gene changes."This is the first indication that these effects kick in pretty quickly",says Huber Warner from the National Institute on Aging near Washington D.C.No one yet knows if calorie restriction works in people as it does in mice,but Spindler is hopeful."There's attracting and tempting evidence out there that it will work,"he says.If it does work in people,there might be good reasons for rejuvenating the liver. As we get older,our bodies are less efficient at metabolizing drugs,for example.A brief period of time of dieting,says Spindler,could be enough to make sure a. drug is effective.But Spindler isn't sure the trade-off is worth it."The mice get less disease,they live longer,but they're hungry,"he says."Even seeing what a diet does,it's still hard to go to a restaurant and say:I can only eat half of that."Spindler hopes we soon won't need to diet at all. His company,Lifespan Genetics in California, is looking for drugs that have the effects of calorie restriction.According to the author,which of the following most interested the researchers? A:The mice that started dieting in old ageB:27 of those 46 old genes that continued to behave like young genesC:Calorie restriction that works in peopleD:Dieting that makes sure a drug is effective
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The Drink Your Body Needs MostI Our bodies are estimated to be about 60% to 70% water. Blood is mostly water,andour muscles,lungs,and brain all contain a lot of water. Water is needed to regulate bodytemperature and to provide the means for nutrients（滋养物）to travel to all our organs. Water also transports oxygen to our cells,removes waste,and protects our joints andorgans.2 We lose water through urination（排尿）,respiration（呼吸）,and by sweating. If youare very active,you lose more water than if you do not take much exercise.Symptoms ofmild dehydration（脱水）include chronic pains in joints and muscles, lower back pain, headaches, and constipation（便秘）.A strong smell to your urine, along with a yellowcolor indicates that you are not getting enough water. Thirst is an obvious sign ofdehydration and in fact,you need water long before you feel thirsty.3 A good rule of thumb（好的做法）is to take your bod犷weight in pounds and divide thatnumber in half. That gives you the number of ounces（盎司）of water per day that youneed.For example,if you weigh 160 pounds,you should drink at least 80 ounces of waterper day.If you exercise you should drink another 8-ounce glass of water for every 20minutes you are active.If you drink coffee or alcohol,you should add at least an equalamount of water. When you are traveling on an airplane,it is good to have 8 ounces ofwater for every hour you are on board the plane.4 It may be difficult to drink enough water on a busy day.Be sure you have water handy atall times by keeping a bottle for water with you when you are working,traveling,orexercising.If you get bored with plain water,add a bit of lemon for a touch of flavor.Thereare some brands of flavored water available,but some of them have sugar or artificial sweeteners that you don't need. Paragraph 3__________A:Ounces of water needed per dayB:Importance of waterC:Composition of waterD:Signs of dehydrationE:Supply of waterF:Necessity for bringing a bottle for water with you
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Cooking Oil Fumes Cause TumorThe leading cause of lung cancer among women in the city was cooking oil fumes while men are more likely to develop the disease from smoking,said medical experts after a five-year research study.Doctors announced the results yesterday with analysis on some new tendencies in lung cancer. They said patients are younger,especially women.According to the Shanghai Tumor research Institute,more local residents die of lung cancer in the city than anything else.Following breast cancer,it has the second-highest incidence rate.“An unhealthy lifestyle is a very important reason for lung cancer,”said Dr He Yumin from Shanghai Minshen Traditional Chinese Medicine Tumor Diagnosis and Treatment Center.He followed 2,276 lung cancer patients for five years.Among them,1,483 were male.Smoking causes 70 percent of cases among men while only 18 percent of female patients developed cancer from smoking or inhaling second-hand smoke,according to the report.However,more than 60 percent of women with the disease had long term,close contact with strong oil fumes from cooking and complained about irritated eyes and throat.About 32 percent of women fried foods in boiling oil in unventilated kitchens and about 25 percent of women's bedrooms were adjacent to the kitchen.However,local women were surprised to learn cooking oil fumes could lead to cancer.Some claimed they may change food preparation methods.“Unless my family and I don't eat at home every day,I must stay in the kitchen to cook,”said Xu Li,a 45-year-old local woman. “I know the fumes are bad for the skin,but it is the first time I heard that it can result in lung cancer. I have already started frying less.”Doctors said women's lung cancer had few links to personal health and physical condition,but was closely related to family cancer history,unhealthy dietary habits and weak immune systems.Other experts agreed with him.“Smoking is by far the biggest cause of lung cancer for men,”said Dr Tan Binyong, honorary president of the Respiratory Disease Institute at Fudan University's Medical College.“It's true that second-hand smoke and cooking fumes are the main causes among women.”His research also warned people not to stand near of stalls selling fried foods due to the poor quality of oils used.The chance of catching lung cancer is three times higher if exposed to the fume for a long time,6 experts said.Which of the following diseases is the most common among the local residents in Shanghai?A: Heart disease. B: Breast cancer.C: Infectious diseases.D: Lung cancer.
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