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下列疾病属于癌前病变或癌前状态除了
白斑
扁平苔藓
红斑
白色角化病
盘状红斑狼疮
下列疾病属于癌前病变或癌前状态除了
白斑
扁平苔藓
红斑
白色角化病
盘状红斑狼疮
口腔黏膜疾病中属于癌前损害的疾病有和
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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.
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____________.
穹隆联合
内脏小神经
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.
人的各种语言中枢分别位于大脑半球的何处
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____________.
迷走神经内含有几种纤维胞体位于何处分布到哪些部位
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.
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____________.
大脑动脉环
试述管理瞳孔开大和瞳孔缩小的自主神经包括性质来源及途径以一示之
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. Whichofthefollowingistrueaccordingtothepassage____________.
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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