东北大学考博模拟试题考博英语阅读理解习题.pdfVIP

中国考博辅导首选学校 东北大学考博模拟试题：考博英语阅读理解习题 Passage3 In science,atheory isareasonable explanationofobservedeventsthat are related.Athe-oryofteninvolvesanimaginarymodelthathelps scientistspicture thewayanobservedeventcouldbeproduced.Agoodexampleofthisisfoundin the kinetic molecular theory, in which gases are pictured as being made up of Ausefultheory,inadditiontoexplainingpastobservations,helpstopredict events that have not as yet been observed.After a theory has been publicized, scientists design experi-merits to test the theory. If observations confirm the scientists predictions,thetheoryissup-ported.Ifobservationsdonotconfirmthe predictions, the scientists must search further. There may be a fault in the experiment,orthetheorymayhavetoberevisedorrejected. Science involves imagination and creative thinking as well as collecting informationandperformingexperiments.Factsbythemselvesarenotscience.As themathematicianJulesHenriPoincaresaid:Scienceisbuiltwithfactsjust asa house isbuilt withbricks, but acollection of factscannotbe called scienceany morethanapileofbrickscanbecalledahouse. Most scientists start an investigation by finding out what other scientists have learned aboutaparticular problem.After known factshavebeen gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutionsarecalledhypotheses. Inaway,anyhypothesisisaleapintotheunknown.Itextendsthescientists thinking beyond the known facts. The scientist plans experiments, performs calculations,andmakesob-servationstotesthypotheses.Forwithouthypotheses, further investigation lacks purpose and direction. When hypotheses are 中国考博辅导首选学校 confirmed,theyareincorporatedintotheories. 11.Thewordthisinthe3rdsentenceinparagraph 1refersto______. A)ago