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女，45岁，发热、咳脓痰1周，胸片示右下背段浸润阴影。用青霉素治疗体温稍下降，但 痰量增多，为脓血痰，有臭味。胸片大片浸润阴影中出现空腔。 患者如果行手术治疗，最正确的处理是
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女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰有臭味胸片大片浸
祛痰药
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女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰有臭味胸片示大片
2周
3周
4周
8周
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰有臭味胸片大片浸
2周
3周
4周
8周
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰
祛痰药
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女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰
心电图
心音图
X线检查
超声心动图
治疗2周后患者临床症状明显改善胸片空腔缩小抗生素总疗程一般宜持续
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8周
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰有臭味胸片示大片
祛痰药
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阿米卡星
红霉素
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰
2周
3周
4周
8周
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但 痰量增多为脓血痰
祛痰药
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红霉素
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰
急性白血病
结核病
淋巴瘤
ITP
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰有臭味胸片大片浸
左侧卧位
右侧卧位
头低仰卧位
头低俯卧位
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但 痰量增多为脓血痰
7.5%
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女45岁发热咳脓痰1周胸片右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰有臭味胸片大片浸润
2周
3周
4周
8周
女45岁发热咳脓痰1周胸片右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰有臭味胸片大片浸润
祛痰药
甲硝唑
阿米卡星
红霉素
女45岁发热咳脓痰1周胸片右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰有臭味胸片大片浸润
2周
3周
4周
6周
8周
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰
甘露醇输注
地塞米松输注
__氧治疗
保护脑细胞
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但 痰量增多为脓血痰
脑中风
颈椎病
颈椎肿瘤
颈椎结核
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但 痰量增多为脓血痰
2周
3周
4周
8周
女45岁发热咳脓痰1周胸片示右下背段浸润阴影用青霉素治疗体温稍下降但痰量增多为脓血痰
手抖
突眼
月经过多
水冲脉
治疗中需加用
祛痰药
甲硝唑
阿米卡星
红霉素
卡巴克洛
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Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Atthestartofthe20thcenturyimmigrantlaborandinnovationhelpedturntheU.S.intoapowerfulmanufacturingnation.Todayforeign-bornengineersjamthecorridorsofSiliconValleyhelpingAmerica’’sinformation-technologyboom.Andasthe21stcenturydawnsyetanotherwaveofimmigrantswillonceagainhelptransformtheeconomy. 46DuringthenextdecadeexceptingachangeingovernmentpolicynearlyamillionimmigrantsareexpectedtoarriveintheU.S.everyyearmostofwhombothlegalandillegalwillcontinuetocomefromLatinAmericaandSoutheastAsiabuteveryforeignlandwillberepresented. Asdomesticbirthratesstagnateonlyforeign-bornworkerwillkeepthelaborpoolgrowing.By2006infactimmigrantswillaccountforhalfofallnewU.S.workers;overthenext30yearstheirsharewillriseto60%. 47EvenatcurrentlevelsofimmigrationaccordingtotheLaborDept.thenumberofpeopleavailabletoworkwillincreasebyamere0.8%peryearbetween1996and2006-halftherateofthepreviousdecade.WithoutimmigrantsaccordingtoanewstudytheU.S.workforcewouldactuallybegintoshrinkby2015. 48It’’snotallaboutsheernumbersofcourse:ToliftproductivityandspurgrowthimmigrantsmustprovidecreativityentrepreneurialenergyorsimpleinitiativethatAmericacouldn’’tfindotherwise.IfallyoudidwasbringinpeoplewhoareexactlythesameasthosewehaveheretherewouldbenoeconomicbenefitsaysRandCorp.economistJamesP.SmithYou’’djusthavemorepeople. Justascrucialthearrayofeducationandskillsimmigrantsbringcouldfitneatlywiththesupplyofjobsoverthenextdecade.AccordingtoLindaLevineattheCongressionalResearchService60%ofthejobscreatedthrough2005willrequiresomepost-secondaryeducation.Butsheaddslow-skilljobswillstillrepresentabouthalfoftotalemployment.49Yetimmigrantsalsoare50%morelikelythanAmericanstohaveagraduatedegreeandanunbelievable23%ofU.S.residentsholdingPhDsinscienceandengineeringareforeign-bornaccordingtotheNationalScienceFoundation. Indeedforeign-bornworkershaveshownanextraordinaryabilitytoassimilateandflourish.Certainlysomelessskilledworkerswillremainatthebottomeconomicrungalltheirlives.50Yetotherswillcatchupquicklyandwithinadecadeoftheirarrivalthewell-educatedwillgofrommakingbarelyhalfthatofnative-bornAmericansincomparableworktonearly90%accordingtoarecentstudy. Thatofcoursewillraiseimmigrants’’livingstandards.Moreimportantitwillhelpdriveinnovationandentrepreneurshipkeyenginesofthe21stCenturyEconomy.
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Sciencehaslonghadanuneasyrelationshipwithotheraspectsofculture.ThinkofGallileo’s17th-centurytrialforhisrebellingbeliefbeforetheCatholicChurchorpoetWilliamBlake’’sharshremarksagainstthemechanisticworldviewofIsaacNewton.Theschismbetweenscienceandthehumanitieshasifanythingdeepenedinthiscentury. Untilrecentlythescientificcommunitywassopowerfulthatitcouldaffordtoignoreitscriticsbutnolonger.AsfundingforsciencehasdeclinedscientistshaveattackedantiscienceinseveralbooksnotablyHigherSuperstitionbyPaulR.GrossabiologistattheUniversityofVirginiaandNormanLevittamathematicianatRutgersUniversity;andTheDemon-HauntedWorldbyCarlSaganofCornellUniversity. DefendersofsciencehavealsovoicedtheirconcernsatmeetingssuchasTheFlightfromScienceandReasonheldinNewYorkCityin1995andScienceintheAgeofMisinformationwhichassembledlastJunenearBuffalo. Antiscienceclearlymeansdifferentthingstodifferentpeople.GrossandLevittfindfaultprimarilywithsociologistsphilosophersandotheracademicswhohavequestionedscience’’sobjectivity.Saganismoreconcernedwiththosewhobelieveinghostscreationismandotherphenomenathatcontradictthescientificworldview. Asurveyofnewsstoriesin1996revealsthattheantisciencetaghasbeenattachedtomanyothergroupsaswellfromauthoritieswhoadvocatedtheeliminationofthelastremainingstocksofsmallpoxvirustoRepublicanswhoadvocateddecreasedfundingforbasicresearch. FewwoulddisputethatthetermappliestotheUnabomberwhosemanifestopublishedin1995scornsscienceandlongsforreturntoapretechnologicalUtopia.ButsurelythatdoesnotmeanenvironmentalistsconcernedaboutuncontrolledindustrialgrowthareantiscienceasanessayinUSNews&WorldReportlastMayseemedtosuggest. Theenvironmentalistsinevitablyrespondtosuchcritics.ThetrueenemiesofsciencearguesPaulEhrtichofStanfordUniversityapioneerofenvironmentalstudiesarethosewhoquestiontheevidencesupportingglobalwarmingthedepletionoftheozonelayerandotherconsequencesofindustrialgrowth. Indeedsomeobserversfearthattheantiscienceepithetisindangerofbecomingmeaningless.Theterm’’antiscience’’canlumptogethertoomanyquitedifferentthingsnotesHarvardUniversityphilosopherGeraldHoltoninhis1993workScienceandAnti-Science.Theyhaveincommononlyonethingthattheytendtoannoyorthreatenthosewhoregardthemselvesasmoreenlightened. ThewordschismLine3Paragraph1inthecontextprobablymeans____________.
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Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
腰椎间盘突出症的诱因是
CouldthebadolddaysofeconomicdeclinebeabouttoreturnSinceOPECagreedtosupply-cutsinMarchthepriceofcrudeoilhasjumpedtoalmost$26abarrelupfromlessthan$10lastDecember.Thisnear-triplingofoilpricescallsupscarymemoriesofthe1973oilshockwhenpricesquadrupledand1979―80whentheyalsoalmosttripled.Bothpreviousshocksresultedindouble-digitinflationandglobaleconomicdecline.Sowherearetheheadlineswarningofgloomanddoomthistime TheoilpricewasgivenanotherpushupthisweekwhenIraqsuspendedoilexports.Strengtheningeconomicgrowthatthesametimeaswintergripsthenorthernhemispherecouldpushthepricehigherstillintheshortterm. Yettherearegoodreasonstoexpecttheeconomicconsequencesnowtobelessseverethaninthe1970s.Inmostcountriesthecostofcrudeoilnowaccountsforasmallershareofthepriceofpetrolthanitdidinthe1970s.InEuropetaxesaccountforuptofour-fifthsoftheretailpricesoevenquitebigchangesinthepriceofcrudehaveamoremutedeffectonpumppricesthaninthepast. Richeconomiesarealsolessdependentonoilthantheywereandsolesssensitivetoswingsintheoilprice.Energyconservationashifttootherfuelsandadeclineintheimportanceofheavyenergy-intensiveindustrieshavereducedoilconsumption.Softwareconsultancyandmobiletelephonesusefarlessoilthansteelorcarproduction.ForeachdollarofGDPinconstantpricesricheconomiesnowusenearly50%lessoilthanin1973.TheOECDestimatesinitslatestEconomicOutlookthatifoilpricesaveraged$22abarrelforafullyearcomparedwith$13in1998thiswouldincreasetheoilimportbillinricheconomiesbyonly0.25-0.5%ofGDP.Thatislessthanone-quarteroftheincomelossin1974or1980.Ontheotherhandoil-importingemergingeconomies--towhichheavyindustryhasshifted--havebecomemoreenergy-intensiveandsocouldbemoreseriouslysqueezed. Onemorereasonnottolosesleepovertheriseinoilpricesisthatunliketherisesinthe1970sithasnotoccurredagainstthebackgroundofgeneralcommodity-priceinflationandglobalexcessdemand.Asizableportionoftheworldisonlyjustemergingfromeconomicdecline.TheEconomist’’scommoditypriceindexisbroadlyunchangingfromayearago.In1973commoditypricesjumpedby70%andin1979byalmost30%.
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Scatteredaroundtheglobearemorethan100smallregionsofisolatedvolcanicactivityknowntogeologistsashotspots.Unlikemostoftheworld’’svolcanoestheyarenotalwaysfoundattheboundariesofthegreatdriftingplatesthatmakeuptheearth’’ssurface;onthecontrarymanyofthemliedeepintheinteriorofaplate.Mostofthehotspotsmoveonlyslowlyandinsomecasesthemovementoftheplatespastthemhaslefttrailsofdeadvolcanoes.Thehotspotsandtheirvolcanictrailsaremilestonesthatmarkthepassageoftheplates. Thattheplatesaremovingisnowbeyonddispute.AfricaandSouthAmericaforexamplearemovingawayfromeachotherasnewmaterialisinjectedintotheseafloorbetweenthem.Thecomplementarycoastlinesandcertaingeologicalfeaturesthatseemtospantheoceanareremindersofwherethetwocontinentswereoncejoined.Therelativemotionoftheplatescarryingthesecontinentshasbeenconstructedindetailbutthemotionofoneplatewithrespecttoanothercannotreadilybetranslatedintomotionwithrespecttotheearth’’sinterior.Itisnotpossibletodeterminewhetherbothcontinentsaremovinginoppositedirectionsorwhetheronecontinentisstationaryandtheotherisdriftingawayfromit.Hotspotsanchoredinthedeeperlayersoftheearthprovidethemeasuringinstrumentsneededtoresolvethequestion.Fromananalysisofthehot-spotpopulationitappearsthattheAfricanplateisstationaryandthatithasnotmovedduringthepast30millionyears. Thesignificanceofhotspotsisnotconfinedtotheirroleasaframeofreference.Itnowappearsthattheyalsohaveanimportantinfluenceonthegeophysicalprocessesthatpropeltheplatesacrosstheglobe.Whenacontinentalplatecomestorestoverahotspotthematerialrisingfromdeeperlayerscreatesabroaddome.Asthedomegrowsitdevelopsdeepfissurescracks:inatleastafewcasesthecontinentmaybreakentirelyalongsomeofthesefissuressothatthehotspotinitiatestheformationofnewocean.Thusjustasearliertheorieshaveexplainedthemobilityofthecontinentssohotspotsmayexplaintheirmutabilityinconstancy. Theauthorbelievesthat____________.
在DNA生物合成中具有催化RNA指导的DNA聚合反应RNA水解及DNA指导的DNA聚合反应三种功能的酶是
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Ofallthecomponentsofagoodnight’’ssleepdreamsseemtobeleastwithinourcontrol.Indreamsawindowopensintoaworldwherelogicissuspendedanddeadpeoplespeak.AcenturyagoFreudformulatedhisrevolutionarytheorythatdreamswerethedisguisedshadowsofourunconsciousdesiresandfears;bythelate1970sneurologistshadswitchedtothinkingofthemasjustmentalnoise―therandombyproductsoftheneural-repairworkthatgoesonduringsleep.Nowresearcherssuspectthatdreamsarepartofthemind’’semotionalthermostatregulatingmoodswhilethebrainisoff-line.Andoneleadingauthoritysaysthattheseintenselypowerfulmentaleventscanbenotonlyharnessedbutactuallybroughtunderconsciouscontroltohelpussleepandfeelbetter.It’’syourdreamsaysRosalindCartwrightchairofpsychologyatChicago’’sMedicalCenter.Ifyoudon’’tlikeitchangeit. Evidencefrombrainimagingsupportsthisview.ThebrainisasactiveduringREMrapideyemovementsleep―whenmostvividdreamsoccur―asitiswhenfullyawakesaysDr.EricNofzingerattheUniversityofPittsburgh.Butnotallpartsofthebrainareequallyinvolved;thelimbicsystemtheemotionalbrainisespeciallyactivewhiletheprefrontalcortexthecenterofintellectandreasoningisrelativelyquiet.WewakeupfromdreamshappyordepressedandthosefeelingscanstaywithusalldaysaysStanfordsleepresearcherDr.WilliamDement. ThelinkbetweendreamsandemotionsshowsupamongthepatientsinCartwright’’sclinic.Mostpeopleseemtohavemorebaddreamsearlyinthenightprogressingtowardhappieronesbeforeawakeningsuggestingthattheyareworkingthroughnegativefeelingsgeneratedduringtheday.Becauseourconsciousmindisoccupiedwithdailylifewedon’’talwaysthinkabouttheemotionalsignificanceoftheday’’sevents―untilitappearswebegintodream. Andthisprocessneednotbelefttotheunconscious.Cartwrightbelievesonecanexerciseconsciouscontroloverrecurringbaddreams.Assoonasyouawakenidentifywhatisupsettingaboutthedream.Visualizehowyouwouldlikeittoendinstead;thenexttimeitoccurstrytowakeupjustenoughtocontrolitscourse.Withmuchpracticepeoplecanlearntoliterallydoitintheirsleep. Attheendofthedaythere’’sprobablylittlereasontopayattentiontoourdreamsatallunlesstheykeepusfromsleepingorwewakeupinapanicCartwrightsays.Terrorismeconomicuncertaintiesandgeneralfeelingsofinsecurityhaveincreasedpeople’’sanxiety.Thosesufferingfrompersistentnightmaresshouldseekhelpfromatherapist.Fortherestofusthebrainhasitswaysofworkingthroughbadfeelings.Sleeporratherdream―onitandyou’’llfeelbetterinthemorning. Researchershavecometobelievethatdreams
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
Atthestartofthe20thcenturyimmigrantlaborandinnovationhelpedturntheU.S.intoapowerfulmanufacturingnation.Todayforeign-bornengineersjamthecorridorsofSiliconValleyhelpingAmerica’’sinformation-technologyboom.Andasthe21stcenturydawnsyetanotherwaveofimmigrantswillonceagainhelptransformtheeconomy. 46DuringthenextdecadeexceptingachangeingovernmentpolicynearlyamillionimmigrantsareexpectedtoarriveintheU.S.everyyearmostofwhombothlegalandillegalwillcontinuetocomefromLatinAmericaandSoutheastAsiabuteveryforeignlandwillberepresented. Asdomesticbirthratesstagnateonlyforeign-bornworkerwillkeepthelaborpoolgrowing.By2006infactimmigrantswillaccountforhalfofallnewU.S.workers;overthenext30yearstheirsharewillriseto60%. 47EvenatcurrentlevelsofimmigrationaccordingtotheLaborDept.thenumberofpeopleavailabletoworkwillincreasebyamere0.8%peryearbetween1996and2006-halftherateofthepreviousdecade.WithoutimmigrantsaccordingtoanewstudytheU.S.workforcewouldactuallybegintoshrinkby2015. 48It’’snotallaboutsheernumbersofcourse:ToliftproductivityandspurgrowthimmigrantsmustprovidecreativityentrepreneurialenergyorsimpleinitiativethatAmericacouldn’’tfindotherwise.IfallyoudidwasbringinpeoplewhoareexactlythesameasthosewehaveheretherewouldbenoeconomicbenefitsaysRandCorp.economistJamesP.SmithYou’’djusthavemorepeople. Justascrucialthearrayofeducationandskillsimmigrantsbringcouldfitneatlywiththesupplyofjobsoverthenextdecade.AccordingtoLindaLevineattheCongressionalResearchService60%ofthejobscreatedthrough2005willrequiresomepost-secondaryeducation.Butsheaddslow-skilljobswillstillrepresentabouthalfoftotalemployment.49Yetimmigrantsalsoare50%morelikelythanAmericanstohaveagraduatedegreeandanunbelievable23%ofU.S.residentsholdingPhDsinscienceandengineeringareforeign-bornaccordingtotheNationalScienceFoundation. Indeedforeign-bornworkershaveshownanextraordinaryabilitytoassimilateandflourish.Certainlysomelessskilledworkerswillremainatthebottomeconomicrungalltheirlives.50Yetotherswillcatchupquicklyandwithinadecadeoftheirarrivalthewell-educatedwillgofrommakingbarelyhalfthatofnative-bornAmericansincomparableworktonearly90%accordingtoarecentstudy. Thatofcoursewillraiseimmigrants’’livingstandards.Moreimportantitwillhelpdriveinnovationandentrepreneurshipkeyenginesofthe21stCenturyEconomy.
下列哪种病理过程不属于动脉粥样硬化
Youwillbereceivingyourbachelor’’sdegreeinMarketingandarelookingforajob.Writealettertoanetworkcompanymanageraccordingtoyourfriend’’sadviceinwhichyoushouldstate 1thepersonofferingyouadvice 2yourstudyandexperienceand 3reasonsofyourinterestinthecompany. Youshouldwriteabout100wordsonANSWERSHEET2.Donotsignyournameattheendoftheletter.UseLiMinginstead.Youdonotneedtowritetheaddress10points.
射血分数是指
脊柱骨折和脱位最基本的辅助检查是
Ofallthecomponentsofagoodnight’’ssleepdreamsseemtobeleastwithinourcontrol.Indreamsawindowopensintoaworldwherelogicissuspendedanddeadpeoplespeak.AcenturyagoFreudformulatedhisrevolutionarytheorythatdreamswerethedisguisedshadowsofourunconsciousdesiresandfears;bythelate1970sneurologistshadswitchedtothinkingofthemasjustmentalnoise―therandombyproductsoftheneural-repairworkthatgoesonduringsleep.Nowresearcherssuspectthatdreamsarepartofthemind’’semotionalthermostatregulatingmoodswhilethebrainisoff-line.Andoneleadingauthoritysaysthattheseintenselypowerfulmentaleventscanbenotonlyharnessedbutactuallybroughtunderconsciouscontroltohelpussleepandfeelbetter.It’’syourdreamsaysRosalindCartwrightchairofpsychologyatChicago’’sMedicalCenter.Ifyoudon’’tlikeitchangeit. Evidencefrombrainimagingsupportsthisview.ThebrainisasactiveduringREMrapideyemovementsleep―whenmostvividdreamsoccur―asitiswhenfullyawakesaysDr.EricNofzingerattheUniversityofPittsburgh.Butnotallpartsofthebrainareequallyinvolved;thelimbicsystemtheemotionalbrainisespeciallyactivewhiletheprefrontalcortexthecenterofintellectandreasoningisrelativelyquiet.WewakeupfromdreamshappyordepressedandthosefeelingscanstaywithusalldaysaysStanfordsleepresearcherDr.WilliamDement. ThelinkbetweendreamsandemotionsshowsupamongthepatientsinCartwright’’sclinic.Mostpeopleseemtohavemorebaddreamsearlyinthenightprogressingtowardhappieronesbeforeawakeningsuggestingthattheyareworkingthroughnegativefeelingsgeneratedduringtheday.Becauseourconsciousmindisoccupiedwithdailylifewedon’’talwaysthinkabouttheemotionalsignificanceoftheday’’sevents―untilitappearswebegintodream. Andthisprocessneednotbelefttotheunconscious.Cartwrightbelievesonecanexerciseconsciouscontroloverrecurringbaddreams.Assoonasyouawakenidentifywhatisupsettingaboutthedream.Visualizehowyouwouldlikeittoendinstead;thenexttimeitoccurstrytowakeupjustenoughtocontrolitscourse.Withmuchpracticepeoplecanlearntoliterallydoitintheirsleep. Attheendofthedaythere’’sprobablylittlereasontopayattentiontoourdreamsatallunlesstheykeepusfromsleepingorwewakeupinapanicCartwrightsays.Terrorismeconomicuncertaintiesandgeneralfeelingsofinsecurityhaveincreasedpeople’’sanxiety.Thosesufferingfrompersistentnightmaresshouldseekhelpfromatherapist.Fortherestofusthebrainhasitswaysofworkingthroughbadfeelings.Sleeporratherdream―onitandyou’’llfeelbetterinthemorning. Thenegativefeelingsgeneratedduringthedaytendto
Scatteredaroundtheglobearemorethan100smallregionsofisolatedvolcanicactivityknowntogeologistsashotspots.Unlikemostoftheworld’’svolcanoestheyarenotalwaysfoundattheboundariesofthegreatdriftingplatesthatmakeuptheearth’’ssurface;onthecontrarymanyofthemliedeepintheinteriorofaplate.Mostofthehotspotsmoveonlyslowlyandinsomecasesthemovementoftheplatespastthemhaslefttrailsofdeadvolcanoes.Thehotspotsandtheirvolcanictrailsaremilestonesthatmarkthepassageoftheplates. Thattheplatesaremovingisnowbeyonddispute.AfricaandSouthAmericaforexamplearemovingawayfromeachotherasnewmaterialisinjectedintotheseafloorbetweenthem.Thecomplementarycoastlinesandcertaingeologicalfeaturesthatseemtospantheoceanareremindersofwherethetwocontinentswereoncejoined.Therelativemotionoftheplatescarryingthesecontinentshasbeenconstructedindetailbutthemotionofoneplatewithrespecttoanothercannotreadilybetranslatedintomotionwithrespecttotheearth’’sinterior.Itisnotpossibletodeterminewhetherbothcontinentsaremovinginoppositedirectionsorwhetheronecontinentisstationaryandtheotherisdriftingawayfromit.Hotspotsanchoredinthedeeperlayersoftheearthprovidethemeasuringinstrumentsneededtoresolvethequestion.Fromananalysisofthehot-spotpopulationitappearsthattheAfricanplateisstationaryandthatithasnotmovedduringthepast30millionyears. Thesignificanceofhotspotsisnotconfinedtotheirroleasaframeofreference.Itnowappearsthattheyalsohaveanimportantinfluenceonthegeophysicalprocessesthatpropeltheplatesacrosstheglobe.Whenacontinentalplatecomestorestoverahotspotthematerialrisingfromdeeperlayerscreatesabroaddome.Asthedomegrowsitdevelopsdeepfissurescracks:inatleastafewcasesthecontinentmaybreakentirelyalongsomeofthesefissuressothatthehotspotinitiatestheformationofnewocean.Thusjustasearliertheorieshaveexplainedthemobilityofthecontinentssohotspotsmayexplaintheirmutabilityinconstancy. Thehot-spottheorymayproveusefulinexplaining____________.
高血压急症患者合并有肾功能不全如果选用利尿剂来降压最常选用的是下列哪一种
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
CouldthebadolddaysofeconomicdeclinebeabouttoreturnSinceOPECagreedtosupply-cutsinMarchthepriceofcrudeoilhasjumpedtoalmost$26abarrelupfromlessthan$10lastDecember.Thisnear-triplingofoilpricescallsupscarymemoriesofthe1973oilshockwhenpricesquadrupledand1979―80whentheyalsoalmosttripled.Bothpreviousshocksresultedindouble-digitinflationandglobaleconomicdecline.Sowherearetheheadlineswarningofgloomanddoomthistime TheoilpricewasgivenanotherpushupthisweekwhenIraqsuspendedoilexports.Strengtheningeconomicgrowthatthesametimeaswintergripsthenorthernhemispherecouldpushthepricehigherstillintheshortterm. Yettherearegoodreasonstoexpecttheeconomicconsequencesnowtobelessseverethaninthe1970s.Inmostcountriesthecostofcrudeoilnowaccountsforasmallershareofthepriceofpetrolthanitdidinthe1970s.InEuropetaxesaccountforuptofour-fifthsoftheretailpricesoevenquitebigchangesinthepriceofcrudehaveamoremutedeffectonpumppricesthaninthepast. Richeconomiesarealsolessdependentonoilthantheywereandsolesssensitivetoswingsintheoilprice.Energyconservationashifttootherfuelsandadeclineintheimportanceofheavyenergy-intensiveindustrieshavereducedoilconsumption.Softwareconsultancyandmobiletelephonesusefarlessoilthansteelorcarproduction.ForeachdollarofGDPinconstantpricesricheconomiesnowusenearly50%lessoilthanin1973.TheOECDestimatesinitslatestEconomicOutlookthatifoilpricesaveraged$22abarrelforafullyearcomparedwith$13in1998thiswouldincreasetheoilimportbillinricheconomiesbyonly0.25-0.5%ofGDP.Thatislessthanone-quarteroftheincomelossin1974or1980.Ontheotherhandoil-importingemergingeconomies--towhichheavyindustryhasshifted--havebecomemoreenergy-intensiveandsocouldbemoreseriouslysqueezed. Onemorereasonnottolosesleepovertheriseinoilpricesisthatunliketherisesinthe1970sithasnotoccurredagainstthebackgroundofgeneralcommodity-priceinflationandglobalexcessdemand.Asizableportionoftheworldisonlyjustemergingfromeconomicdecline.TheEconomist’’scommoditypriceindexisbroadlyunchangingfromayearago.In1973commoditypricesjumpedby70%andin1979byalmost30%.
Sciencehaslonghadanuneasyrelationshipwithotheraspectsofculture.ThinkofGallileo’s17th-centurytrialforhisrebellingbeliefbeforetheCatholicChurchorpoetWilliamBlake’’sharshremarksagainstthemechanisticworldviewofIsaacNewton.Theschismbetweenscienceandthehumanitieshasifanythingdeepenedinthiscentury. Untilrecentlythescientificcommunitywassopowerfulthatitcouldaffordtoignoreitscriticsbutnolonger.AsfundingforsciencehasdeclinedscientistshaveattackedantiscienceinseveralbooksnotablyHigherSuperstitionbyPaulR.GrossabiologistattheUniversityofVirginiaandNormanLevittamathematicianatRutgersUniversity;andTheDemon-HauntedWorldbyCarlSaganofCornellUniversity. DefendersofsciencehavealsovoicedtheirconcernsatmeetingssuchasTheFlightfromScienceandReasonheldinNewYorkCityin1995andScienceintheAgeofMisinformationwhichassembledlastJunenearBuffalo. Antiscienceclearlymeansdifferentthingstodifferentpeople.GrossandLevittfindfaultprimarilywithsociologistsphilosophersandotheracademicswhohavequestionedscience’’sobjectivity.Saganismoreconcernedwiththosewhobelieveinghostscreationismandotherphenomenathatcontradictthescientificworldview. Asurveyofnewsstoriesin1996revealsthattheantisciencetaghasbeenattachedtomanyothergroupsaswellfromauthoritieswhoadvocatedtheeliminationofthelastremainingstocksofsmallpoxvirustoRepublicanswhoadvocateddecreasedfundingforbasicresearch. FewwoulddisputethatthetermappliestotheUnabomberwhosemanifestopublishedin1995scornsscienceandlongsforreturntoapretechnologicalUtopia.ButsurelythatdoesnotmeanenvironmentalistsconcernedaboutuncontrolledindustrialgrowthareantiscienceasanessayinUSNews&WorldReportlastMayseemedtosuggest. Theenvironmentalistsinevitablyrespondtosuchcritics.ThetrueenemiesofsciencearguesPaulEhrtichofStanfordUniversityapioneerofenvironmentalstudiesarethosewhoquestiontheevidencesupportingglobalwarmingthedepletionoftheozonelayerandotherconsequencesofindustrialgrowth. Indeedsomeobserversfearthattheantiscienceepithetisindangerofbecomingmeaningless.Theterm’’antiscience’’canlumptogethertoomanyquitedifferentthingsnotesHarvardUniversityphilosopherGeraldHoltoninhis1993workScienceandAnti-Science.Theyhaveincommononlyonethingthattheytendtoannoyorthreatenthosewhoregardthemselvesasmoreenlightened. Whichofthefollowingistrueaccordingtothepassage____________.
Ofallthecomponentsofagoodnight’’ssleepdreamsseemtobeleastwithinourcontrol.Indreamsawindowopensintoaworldwherelogicissuspendedanddeadpeoplespeak.AcenturyagoFreudformulatedhisrevolutionarytheorythatdreamswerethedisguisedshadowsofourunconsciousdesiresandfears;bythelate1970sneurologistshadswitchedtothinkingofthemasjustmentalnoise―therandombyproductsoftheneural-repairworkthatgoesonduringsleep.Nowresearcherssuspectthatdreamsarepartofthemind’’semotionalthermostatregulatingmoodswhilethebrainisoff-line.Andoneleadingauthoritysaysthattheseintenselypowerfulmentaleventscanbenotonlyharnessedbutactuallybroughtunderconsciouscontroltohelpussleepandfeelbetter.It’’syourdreamsaysRosalindCartwrightchairofpsychologyatChicago’’sMedicalCenter.Ifyoudon’’tlikeitchangeit. Evidencefrombrainimagingsupportsthisview.ThebrainisasactiveduringREMrapideyemovementsleep―whenmostvividdreamsoccur―asitiswhenfullyawakesaysDr.EricNofzingerattheUniversityofPittsburgh.Butnotallpartsofthebrainareequallyinvolved;thelimbicsystemtheemotionalbrainisespeciallyactivewhiletheprefrontalcortexthecenterofintellectandreasoningisrelativelyquiet.WewakeupfromdreamshappyordepressedandthosefeelingscanstaywithusalldaysaysStanfordsleepresearcherDr.WilliamDement. ThelinkbetweendreamsandemotionsshowsupamongthepatientsinCartwright’’sclinic.Mostpeopleseemtohavemorebaddreamsearlyinthenightprogressingtowardhappieronesbeforeawakeningsuggestingthattheyareworkingthroughnegativefeelingsgeneratedduringtheday.Becauseourconsciousmindisoccupiedwithdailylifewedon’’talwaysthinkabouttheemotionalsignificanceoftheday’’sevents―untilitappearswebegintodream. Andthisprocessneednotbelefttotheunconscious.Cartwrightbelievesonecanexerciseconsciouscontroloverrecurringbaddreams.Assoonasyouawakenidentifywhatisupsettingaboutthedream.Visualizehowyouwouldlikeittoendinstead;thenexttimeitoccurstrytowakeupjustenoughtocontrolitscourse.Withmuchpracticepeoplecanlearntoliterallydoitintheirsleep. Attheendofthedaythere’’sprobablylittlereasontopayattentiontoourdreamsatallunlesstheykeepusfromsleepingorwewakeupinapanicCartwrightsays.Terrorismeconomicuncertaintiesandgeneralfeelingsofinsecurityhaveincreasedpeople’’sanxiety.Thosesufferingfrompersistentnightmaresshouldseekhelpfromatherapist.Fortherestofusthebrainhasitswaysofworkingthroughbadfeelings.Sleeporratherdream―onitandyou’’llfeelbetterinthemorning. WhatadvicemightCartwrightgivetothosewhosometimeshavebaddreams
Thehumannoseisanunderratedtool.Humansareoftenthoughttobeinsensitivesmellerscomparedwithanimals________thisislargelybecause________animalswestandupright.Thismeansthatournosesare________toperceivingthosesmellswhichfloatthroughtheair________themajorityofsmellswhichsticktosurfaces.Infact________weareextremelysensitivetosmells________wedonotgenerallyrealizeit.Ournosesarecapableof________humansmellsevenwhentheseare________tofarbelowonepartinonemillion. Strangelysomepeoplefindthattheycansmellonetypeofflowerbutnotanother________othersaresensitivetothesmellsofbothflowers.Thismaybebecausesomepeopledonothavethegenesnecessarytogenerate________smellreceptorsinthenose.Thesereceptorsarethecellswhichsensesmellsandsend________tothebrain.Howeverithasbeenfoundthatevenpeopleinsensitivetoacertainsmell________cansuddenlybecomesensitivetoitwhen________toitoftenenough. Theexplanationforinsensitivitytosmellseemstobethatthebrainfindsit________tokeepallsmellreceptorsworkingallthetimebutcan________newreceptorsifnecessary.Thismay________explainwhywearenotusuallysensitivetoourownsmells―wesimplydonotneedtobe.Wearenot________oftheusualsmellofourownhousebutwe________newsmellswhenwevisitsomeoneelse’’s.Thebrainfindsitbesttokeepsmellreceptors________forunfamiliarandemergencysignals________thesmellofsmokewhichmightindicatethedangeroffire.
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