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We're entering a new phase in international relations.
A:phrase
B:stage
C:point
D:state
B:stage
C:point
D:state
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参考解析
解析：我们在国际关系方面正步入新的阶段。stage“阶段”，例如：at an early stage in our history在我们历史发展的早期。phrase"短语，词组”，例如：That's exactly the phrase I was looking for myself．这就是我一直找的那个成语。point“尖端，要点，观点”，例如：Various committee members made interesting points．许多委员提出了令人关注的意见。state“状态，国家”，例如：a poor state of health健康欠佳。只有stage意思上和phas。最接近。
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Are You Getting Enough Sleep?What happens if you don't get enough sleep? Randy Gardner,a high school student in the United States,wanted to find out. He designed an experiment on the effects of sleeplessness for a school science project. With doctors watching him carefully,Gardner stayed awake for 264 hours and 12 minutes.That's eleven days and nights without sleep!What effect did sleeplessness have on Gardner? After 24 hours without sleep,Gardner started havingtrouble reading and watching television. The words and pictures were too blurry（模糊）.By the third day,he was having trouble doing things withhis hands. By the fourth day, Gardner was hallucinating（产生幻觉）.For example,when he saw a street sign,he thought it was a person.He also imagined he was a famousfootball player. Over the next few days, Gardner's speech became so slurred（不清楚）that people couldn't understand him.He also had trouble remembering things.By the eleventh day, Gardner couldn't pass acounting test.In the middle of the test he simply stopped counting.He couldn't remember what hewas doing.When Gardner finally went to bed,he slept for 14 hours and 45 minutes.The second night he slept for twelve hours,the third night he slept for ten and one-half hours,and by the fourth night,he had returned tohis normal sleep schedule.Even though Gardner recovered quickly,scientists believe that going without sleep can be dangerous. They say that people should not repeat Randy's experiment. Tests on white rats have shown how serious sleeplessness can be. After a few weeks without sleep, the rats started losing their fur（皮毛）.And even though the rats ate more food than usual,they lost weight.Eventually the rats died.During your lifetime,you will probably spend 25 years or more sleeping.But why?What is the purpose of sleep? Surprisingly,scientists don't know for sure.Some scientists think we sleep in order to replenish（补充）brain cells. Other scientists think that sleep helps the body to grow and to relieve stress. Whatever the reason,we know that it is important to get enough sleep.During the experiment,Gardner slept for two hours every night.A:RightB:WrongC:Not mentioned
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Dangers Await Babies with AltitudeWomen who live in the world's highest communities tend to give birth to underweight babies, a new study suggests.These babies may grow into adults with a high risk of heart disease and strokes.Research has hinted that newborns in mountain communities are lighter than average.But it wasn't clear whether this is due to reduced oxygen levels at high altitude or because their mothers are under-nourished—many people who live at high altitudes are relatively poor compared witf those living lower down.To find out more,Dino Giussani and his team at Cambridge University studied the records of 400 births in Bolivia during 1997 and 1998.The babies were born in both rich and poor areas of two cities:La Paz and Santa Cruz.La Paz is the highest city in the world,at 3 .65 kilometers above sea level,while Santa Cruz is much lower,at 0 .44 kilometers.Sure enough,Giussani found that the average birthweight of babies in La Paz was significantly lower than in Santa Cruz.This was true in both high and low-income families.Even babies borr to poor families in Santa Cruz were heavier on average than babies born to wealthy families in lofty La Paz.“We were very surprised by this result,”says Giussani.The results suggest that babies born at high altitude are deprived of oxygen before birth. “This may trigger the release or suppression of hormones that regulate growth of the unborn child,”says Giussani.His team also found that high-altitude babies tended to have relatively larger heads compared with their bodies.This is probably because a fetus starved of oxygen will send oxygenated blood to the brain in preference to the rest of the body.Giussani wants to find out if such babies have a higher risk of disease in later life.People born in La Paz might be prone to heart trouble in adulthood,for example.Low birthweight is a risk factor for coronary heart disease .And newborns with a high ratio of head size to body weight are often predisposed to high blood pressure and strokes in later life. The results of the study indicate the reason for the birth of underweight babies is_________.A: lack of certain nutritionB: poverty of their mothersC: different family backgroundsD: reduction of oxygen levels
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第三篇Scientific AttitudeWe all know that science plays an important role in our society.However,many people believe that our progress depends on two different aspects of science.The first aspect is the application of the machines,products and systems of knowledge that scientists and technologists develop.The second is the application of the special methods of thought and action that scientists use in their work.What are these special methods of thinking and acting? First of all,it seems that a successful scientist is curious一he wants to find out how and why the universe works.He usually pays attention to problems which he notices have no satisfying explanation,and looks for relationships even if the data available seem to be unconnected.Moreover,he thinks he can improve the existing conditions and enjoys trying to solve the problems which this involves.He is a good observer, accurate, patient and objective（客观的）and uses the facts he observes to the fullest. For example,trained observers obtain a very large amount of information about a star mainly from the accurate analysis of the simple lines that appear in a spectrum（光谱）.He does not accept statements which are not based on the most complete evidence available.He rejects authority as the only basis for truth.Scientists always check statements and make experiments carefully and objectively.Furthermore,he does not readily accept his own idea,since he knows that man is the least reliable of scientific instmments and that a number of factors tend to disturb objective investigation.Lastly,he 15 full of imagination since he often has to look for relationships in data which are not only complex but also frequently incomplete.Furthermore,he needs imagination if he wants to guess how processes work and how events take place.These seem to be some of the ways in which a successful scientist or technologist thinks and acts.Many people believe that science helps society to progress through________.A:knowledge onlyB:more than one aspectC:technologyD:the use of machines
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The hospital needs to employ some more nurses.A:use
B:hire
C:own
D:refuse
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