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A．委中 B，瞳子髎 C．承泣 D，肩井
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胆经的首穴是
瞳子髎
睛明
承泣
丝竹空
既可直刺深刺又可针刺放血的腧穴是
肩井
承泣
瞳子髎
委中
既可直刺深刺又可针刺放血的腧穴是
委中
瞳子髎
承泣
D，肩井
针刺操作时应注意轻慢压的腧穴是
肩井
承泣
瞳子髎
委中
百会
既可直刺深刺又可针刺放血的腧穴是
肩井
承泣
瞳子髎
委中
百会
针刺操作时应注意轻慢压的腧穴是
肩井
承泣
瞳子髎
委中
针刺操作时应注意轻慢压的腧穴是
委中
瞳子髎
承泣
D，肩井
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难经经释所说脏气受制于我则邪气不能深入故为微邪是指哪种疾病传变形式
Everybodylovesafatpayrise.Yetpleasureatyourowncanvanishifyoulearnthatacolleaguehasbeengivenabiggerone.Indeedifhehasareputationforslackingyoumightevenbeoutraged.Suchbehaviourisregardedasalltoohumanwiththeunderlyingassumptionthatotheranimalswouldnotbecapableofthisfinelydevelopedsenseofgrievance.ButastudybySarahBrosnanandFransdeWaalofEmoryUniversityinAtlantaGeorgiawhichhasjustbeenpublishedinNaturesuggeststhatitisalltoomonkeyaswell. Theresearchersstudiedthebehaviouroffemalebrowncapuchinmonkeys.Theylookcute.Theyaregood-naturedco-operativecreaturesandtheysharetheirfoodreadily.Aboveallliketheirfemalehumancounterpartstheytendtopaymuchcloserattentiontothevalueofgoodsandservicesthanmales. SuchcharacteristicsmakethemperfectcandidatesforDr.Brosnan’sandDr.deWaal’sstudy.Theresearchersspenttwoyearsteachingtheirmonkeystoexchangetokensforfood.Normallythemonkeyswerehappyenoughtoexchangepiecesofrockforslicesofcucumber.Howeverwhentwomonkeyswereplacedinseparatebutadjoiningchamberssothateachcouldobservewhattheotherwasgettinginreturnforitsrocktheirbehaviourbecamemarkedlydifferent. Intheworldofcapuchinsgrapesareluxurygoodsandmuchpreferabletocucumbers.Sowhenonemonkeywashandedagrapeinexchangeforhertokenthesecondwasreluctanttohandhersoverforamerepieceofcucumber.Andifonereceivedagrapewithouthavingtoprovidehertokeninexchangeatalltheothereithertossedherowntokenattheresearcheroroutofthechamberorrefusedtoacceptthesliceofcucumber.Indeedthemerepresenceofagrapeintheotherchamberwithoutanactualmonkeytoeatitwasenoughtoinduceresentmentinafemalecapuchin. Theresearcherssuggestthatcapuchinmonkeyslikehumansareguidedbysocialemotions.Inthewildtheyareaco-operativegroup-livingspecies.Suchco-operationislikelytobestableonlywheneachanimalfeelsitisnotbeingcheated.Feelingsofrighteousndignationitseemsarenotthepreserveofpeoplealone.Refusingalesserrewardcompletelymakesthesefeelingsabundantlycleartoothermembersofthegroup.Howeverwhethersuchasenseoffairnessevolvedindependentlyincapuchinsandhumansorwhetheritstemsfromthecommonancestorthatthespecieshad35millionyearsagoisasyetanunansweredquestion. Intheopeningparagraphtheauthorintroduceshistopicby
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. Cartwrightseemstosuggestthat
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.
AmericansnolongerexpectpublicfigureswhetherinspeechorinwritingtocommandtheEnglishlanguagewithskillandgift.Nordotheyaspiretosuchcommandthemselves.InhislatestbookDoingOurOwnThing:TheDegradationofLanguageandMusicandWhyWeShouldLikeCareJohnMcWhorteralinguistandcontroversialistofmixedliberalandconservativeviewsseesthetriumphof1960scounter-cultureasresponsibleforthedeclineofformalEnglish. Blamingthepermissive1960sisnothingnewbutthisisnotyetanothercriticismagainstthedeclineineducation.Mr.McWhorter’sacademicspecialityislanguagehistoryandchangeandheseesthegradualdisappearanceofwhomforexampletobenaturalandnomoreregrettablethanthelossofthecase-endingsofOldEnglish. Butthecultoftheauthenticandthepersonaldoingourownthinghasspeltthedeathofformalspeechwritingpoetryandmusic.Whileeventhemodestlyeducatedsoughtanelevatedtonewhentheyputpentopaperbeforethe1960seventhemostwellregardedwritingsincethenhassoughttocapturespokenEnglishonthepage.Equallyinpoetrythehighlypersonalperformativegenreistheonlyformthatcouldclaimrealliveliness.InbothoralandwrittenEnglishtalkingstriumphingoverspeakingspontaneityovercraft. IllustratedwithanentertainingarrayofexamplesfrombothhighandlowculturethetrendthatMr.McWhorterdocumentsisunmistakable.Butitislesscleartotakethequestionofhissubtitlewhyweshouldlikecare.Asalinguistheacknowledgesthatallvarietiesofhumanlanguageincludingnon-standardoneslikeBlackEnglishcanbepowerfullyexpressive--thereexistsnolanguageordialectintheworldthatcannotconveycomplexideas.Heisnotarguingasmanydothatwecannolongerthinkstraightbecausewedonottalkproper. RussianshaveadeeplovefortheirownlanguageandcarrylargechunksofmemorizedpoetryintheirheadswhileItalianpoliticianstendtoelaboratespeechthatwouldseemold-fashionedtomostEnglish-speakers.Mr.McWhorteracknowledgesthatformallanguageisnotstrictlynecessaryandproposesnoradicaleducationreforms--heisreallygrievingoverthelossofsomethingbeautifulmorethanuseful.WenowtakeourEnglishonpaperplatesinsteadofchina.Ashameperhapsbutprobablyaninevitableone. Accordingtothelastparagraphpaperplatesistochinaas
ItisnoteasytotalkabouttheroleofthemassmediainthisoverwhelminglysignificantphaseinEuropeanhistory.Historyandnewsbecomeconfusedandone’simpressionstendtobeamixtureofskepticismandoptimism.46Televisionisoneofthemeansbywhichthesefeelingsarecreatedandconveyed--andperhapsneverbeforehasitservedsomuchtoconnectdifferentpeoplesandnationsasintherecenteventsinEurope.TheEuropethatisnowformingcannotbeanythingotherthanitspeoplestheirculturesandnationalidentifies.WiththisinmindwecanbegintoanalyzetheEuropeantelevisionscene.47InEurope.aselsewheremulti-mediagroupshavebeenincreasinglysuccessful:groupswhichbringtogethertelevisionradionewspapersmagazinesandpublishinghousesthatworkinrelationtooneanother.OneItalianexamplewouldbetheBerlusconigroupwhileabroadMaxwellandMurdochcometomind. Clearlyonlythebiggestandmostflexibletelevisioncompaniesaregoingtobeabletocompeteinsucharichandhotly-contestedmarket.48Thisalonedemonstratesthatthetelevisionbusinessisnotaneasyworldtosurvivein.afactunderlinedbystatisticsthatshowthatoutofeightyEuropeantelevisionnetworksnolessthan50%tookalossin1989. MoreovertheintegrationoftheEuropeancommunitywillobligetelevisioncompaniestocooperatemorecloselyintermsofbothproductionanddistribution. 49CreatingaEuropeanidentitythatrespectsthedifferentculturesandtraditionswhichgotomakeuptheconnectingfabricoftheOldContinentisnoeasytaskanddemandsastrategicchoice―thatofproducingprogramsinEuropeforEurope.ThisentailsreducingourdependenceontheNorthAmericanmarketwhoseprogramsrelatetoexperiencesandculturaltraditionswhicharedifferentfromourown Inordertoachievetheseobjectiveswemustconcentratemoreonco-productionstheexchangeofnewsdocumentaryservicesandtraining.ThisalsoinvolvestheagreementsbetweenEuropeancountriesforthecreationofaEuropeanbankforTelevisionProductionwhichonthemodeloftheEuropeanInvestmentsBankwillhandlethefinancesnecessaryforproductioncosts.50Indealingwithachallengeonsuchascaleitisnoexaggerationtosay.Unitedwestanddividedwefall―andifIhadtochooseasloganitwouldbeUnityinourdiversityAunityofobjectivesthatnonethelessrespectthevariedpeculiaritiesofeachcountry.
AmericansnolongerexpectpublicfigureswhetherinspeechorinwritingtocommandtheEnglishlanguagewithskillandgift.Nordotheyaspiretosuchcommandthemselves.InhislatestbookDoingOurOwnThing:TheDegradationofLanguageandMusicandWhyWeShouldLikeCareJohnMcWhorteralinguistandcontroversialistofmixedliberalandconservativeviewsseesthetriumphof1960scounter-cultureasresponsibleforthedeclineofformalEnglish. Blamingthepermissive1960sisnothingnewbutthisisnotyetanothercriticismagainstthedeclineineducation.Mr.McWhorter’sacademicspecialityislanguagehistoryandchangeandheseesthegradualdisappearanceofwhomforexampletobenaturalandnomoreregrettablethanthelossofthecase-endingsofOldEnglish. Butthecultoftheauthenticandthepersonaldoingourownthinghasspeltthedeathofformalspeechwritingpoetryandmusic.Whileeventhemodestlyeducatedsoughtanelevatedtonewhentheyputpentopaperbeforethe1960seventhemostwellregardedwritingsincethenhassoughttocapturespokenEnglishonthepage.Equallyinpoetrythehighlypersonalperformativegenreistheonlyformthatcouldclaimrealliveliness.InbothoralandwrittenEnglishtalkingstriumphingoverspeakingspontaneityovercraft. IllustratedwithanentertainingarrayofexamplesfrombothhighandlowculturethetrendthatMr.McWhorterdocumentsisunmistakable.Butitislesscleartotakethequestionofhissubtitlewhyweshouldlikecare.Asalinguistheacknowledgesthatallvarietiesofhumanlanguageincludingnon-standardoneslikeBlackEnglishcanbepowerfullyexpressive--thereexistsnolanguageordialectintheworldthatcannotconveycomplexideas.Heisnotarguingasmanydothatwecannolongerthinkstraightbecausewedonottalkproper. RussianshaveadeeplovefortheirownlanguageandcarrylargechunksofmemorizedpoetryintheirheadswhileItalianpoliticianstendtoelaboratespeechthatwouldseemold-fashionedtomostEnglish-speakers.Mr.McWhorteracknowledgesthatformallanguageisnotstrictlynecessaryandproposesnoradicaleducationreforms--heisreallygrievingoverthelossofsomethingbeautifulmorethanuseful.WenowtakeourEnglishonpaperplatesinsteadofchina.Ashameperhapsbutprobablyaninevitableone. TowhichofthefollowingstatementswouldMcWhortermostlikelyagree?
TwomonthsagoyougotajobasaneditorforthemagazineDesigns&Fashions.Butnowyoufindthattheworkisnotwhatyouexpected.Youdecidetoquit.WritealettertoyourbossMr.Wangtellinghimyourdecisionstatingyourreasonsandmakinganapology.Writeyourletterwithnolessthan100words.WriteitneatlyonANSWERSHEET2.Donotsignyourownnameattheendoftheletter;useLiMinginstead.Youdonotneedtowritetheaddress.10points
五脏六腑之精皆上注于目其中肺之精气上注于
素问·厥论说春夏则阳气多而阴气少秋冬则阴气盛而阳气衰说明了
孟德尔的植物杂交试验的论文于1866年正式发表后沉睡了34年未受重视直到1900年才被重新发现请简述这段重新发现的史实分析孟德尔的论文被埋没和重新发现的原因并对孟德尔的科学贡献作一简明而全面的评价
AmericansnolongerexpectpublicfigureswhetherinspeechorinwritingtocommandtheEnglishlanguagewithskillandgift.Nordotheyaspiretosuchcommandthemselves.InhislatestbookDoingOurOwnThing:TheDegradationofLanguageandMusicandWhyWeShouldLikeCareJohnMcWhorteralinguistandcontroversialistofmixedliberalandconservativeviewsseesthetriumphof1960scounter-cultureasresponsibleforthedeclineofformalEnglish. Blamingthepermissive1960sisnothingnewbutthisisnotyetanothercriticismagainstthedeclineineducation.Mr.McWhorter’sacademicspecialityislanguagehistoryandchangeandheseesthegradualdisappearanceofwhomforexampletobenaturalandnomoreregrettablethanthelossofthecase-endingsofOldEnglish. Butthecultoftheauthenticandthepersonaldoingourownthinghasspeltthedeathofformalspeechwritingpoetryandmusic.Whileeventhemodestlyeducatedsoughtanelevatedtonewhentheyputpentopaperbeforethe1960seventhemostwellregardedwritingsincethenhassoughttocapturespokenEnglishonthepage.Equallyinpoetrythehighlypersonalperformativegenreistheonlyformthatcouldclaimrealliveliness.InbothoralandwrittenEnglishtalkingstriumphingoverspeakingspontaneityovercraft. IllustratedwithanentertainingarrayofexamplesfrombothhighandlowculturethetrendthatMr.McWhorterdocumentsisunmistakable.Butitislesscleartotakethequestionofhissubtitlewhyweshouldlikecare.Asalinguistheacknowledgesthatallvarietiesofhumanlanguageincludingnon-standardoneslikeBlackEnglishcanbepowerfullyexpressive--thereexistsnolanguageordialectintheworldthatcannotconveycomplexideas.Heisnotarguingasmanydothatwecannolongerthinkstraightbecausewedonottalkproper. RussianshaveadeeplovefortheirownlanguageandcarrylargechunksofmemorizedpoetryintheirheadswhileItalianpoliticianstendtoelaboratespeechthatwouldseemold-fashionedtomostEnglish-speakers.Mr.McWhorteracknowledgesthatformallanguageisnotstrictlynecessaryandproposesnoradicaleducationreforms--heisreallygrievingoverthelossofsomethingbeautifulmorethanuseful.WenowtakeourEnglishonpaperplatesinsteadofchina.Ashameperhapsbutprobablyaninevitableone. AccordingtoMcWhorterthedeclineofformalEnglish
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.
从突变的分子基础看能否实现定向变异为什么通常从一个野生型基因变成突变型的频率总是显著地高于回复突变率如何解释
Doyourememberallthoseyearswhenscientistsarguedthatsmokingwouldkillusbutthedoubtersinsistedthatwedidn’tknowforsure?Thattheevidencewasinconclusivethescienceuncertain?Thattheantismokinglobbywasouttodestroyourwayoflifeandthegovernmentshouldstayoutoftheway?LotsofAmericansboughtthatnonsenseandoverthreedecadessome10millionsmokerswenttoearlygraves. Thereareupsettingparallelstodayasscientistsinonewaveafteranothertrytoawakenustothegrowingthreatofglobalwarming.ThelatestwasapanelfromtheNationalAcademyofSciencesenlistedbytheWhiteHousetotellusthattheEarth’satmosphereisdefinitelywarmingandthattheproblemislargelyman-made.Theclearmessageisthatweshouldgetmovingtoprotectourselves.ThepresidentoftheNationalAcademyBruceAlbertsaddedthiskeypointintheprefacetothepanel’sreport:Scienceneverhasalltheanswers.Butsciencedoesprovideuswiththebestavailableguidetothefutureanditiscriticalthatournationandtheworldbaseimportantpoliciesonthebestjudgmentsthatsciencecanprovideconcerningthefutureconsequencesofpresentactions. Justasonsmokingvoicesnowcomefrommanyquartersinsistingthatthescienceaboutglobalwarmingisincompletethatit’sOKtokeeppouringfumesintotheairuntilweknowforsure.Thisisadangerousgame:bythetime100percentoftheevidenceisinitmaybetoolate.Withtherisksobviousandgrowingaprudentpeoplewouldtakeoutaninsurancepolicynow. FortunatelytheWhiteHouseisstartingtopayattention.Butit’sobviousthatamajorityofthepresident’sadvisersstilldon’ttakeglobalwarmingseriously.Insteadofaplanofactiontheycontinuetopressformoreresearch―aclassiccaseofparalysisbyanalysis. Toserveasresponsiblestewardsoftheplanetwemustpressforwardondeeperatmosphericandoceanicresearch.Butresearchaloneisinadequate.IftheAdministrationwon’ttakethelegislativeinitiativeCongressshouldhelptobeginfashioningconservationmeasures.AbillbyDemocraticSenatorRobertByrdofWestVirginiawhichwouldofferfinancialincentivesforprivateindustryisapromisingstart.Manyseethatthecountryisgettingreadytobuildlotsofnewpowerplantstomeetourenergyneeds.Ifweareevergoingtoprotecttheatmosphereitiscrucialthatthosenewplantsbeenvironmentallysound. AccordingtoBruceAlbertssciencecanserveas
ItisnoteasytotalkabouttheroleofthemassmediainthisoverwhelminglysignificantphaseinEuropeanhistory.Historyandnewsbecomeconfusedandone’simpressionstendtobeamixtureofskepticismandoptimism.46Televisionisoneofthemeansbywhichthesefeelingsarecreatedandconveyed--andperhapsneverbeforehasitservedsomuchtoconnectdifferentpeoplesandnationsasintherecenteventsinEurope.TheEuropethatisnowformingcannotbeanythingotherthanitspeoplestheirculturesandnationalidentifies.WiththisinmindwecanbegintoanalyzetheEuropeantelevisionscene.47InEurope.aselsewheremulti-mediagroupshavebeenincreasinglysuccessful:groupswhichbringtogethertelevisionradionewspapersmagazinesandpublishinghousesthatworkinrelationtooneanother.OneItalianexamplewouldbetheBerlusconigroupwhileabroadMaxwellandMurdochcometomind. Clearlyonlythebiggestandmostflexibletelevisioncompaniesaregoingtobeabletocompeteinsucharichandhotly-contestedmarket.48Thisalonedemonstratesthatthetelevisionbusinessisnotaneasyworldtosurvivein.afactunderlinedbystatisticsthatshowthatoutofeightyEuropeantelevisionnetworksnolessthan50%tookalossin1989. MoreovertheintegrationoftheEuropeancommunitywillobligetelevisioncompaniestocooperatemorecloselyintermsofbothproductionanddistribution. 49CreatingaEuropeanidentitythatrespectsthedifferentculturesandtraditionswhichgotomakeuptheconnectingfabricoftheOldContinentisnoeasytaskanddemandsastrategicchoice―thatofproducingprogramsinEuropeforEurope.ThisentailsreducingourdependenceontheNorthAmericanmarketwhoseprogramsrelatetoexperiencesandculturaltraditionswhicharedifferentfromourown Inordertoachievetheseobjectiveswemustconcentratemoreonco-productionstheexchangeofnewsdocumentaryservicesandtraining.ThisalsoinvolvestheagreementsbetweenEuropeancountriesforthecreationofaEuropeanbankforTelevisionProductionwhichonthemodeloftheEuropeanInvestmentsBankwillhandlethefinancesnecessaryforproductioncosts.50Indealingwithachallengeonsuchascaleitisnoexaggerationtosay.Unitedwestanddividedwefall―andifIhadtochooseasloganitwouldbeUnityinourdiversityAunityofobjectivesthatnonethelessrespectthevariedpeculiaritiesofeachcountry.
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.
Everybodylovesafatpayrise.Yetpleasureatyourowncanvanishifyoulearnthatacolleaguehasbeengivenabiggerone.Indeedifhehasareputationforslackingyoumightevenbeoutraged.Suchbehaviourisregardedasalltoohumanwiththeunderlyingassumptionthatotheranimalswouldnotbecapableofthisfinelydevelopedsenseofgrievance.ButastudybySarahBrosnanandFransdeWaalofEmoryUniversityinAtlantaGeorgiawhichhasjustbeenpublishedinNaturesuggeststhatitisalltoomonkeyaswell. Theresearchersstudiedthebehaviouroffemalebrowncapuchinmonkeys.Theylookcute.Theyaregood-naturedco-operativecreaturesandtheysharetheirfoodreadily.Aboveallliketheirfemalehumancounterpartstheytendtopaymuchcloserattentiontothevalueofgoodsandservicesthanmales. SuchcharacteristicsmakethemperfectcandidatesforDr.Brosnan’sandDr.deWaal’sstudy.Theresearchersspenttwoyearsteachingtheirmonkeystoexchangetokensforfood.Normallythemonkeyswerehappyenoughtoexchangepiecesofrockforslicesofcucumber.Howeverwhentwomonkeyswereplacedinseparatebutadjoiningchamberssothateachcouldobservewhattheotherwasgettinginreturnforitsrocktheirbehaviourbecamemarkedlydifferent. Intheworldofcapuchinsgrapesareluxurygoodsandmuchpreferabletocucumbers.Sowhenonemonkeywashandedagrapeinexchangeforhertokenthesecondwasreluctanttohandhersoverforamerepieceofcucumber.Andifonereceivedagrapewithouthavingtoprovidehertokeninexchangeatalltheothereithertossedherowntokenattheresearcheroroutofthechamberorrefusedtoacceptthesliceofcucumber.Indeedthemerepresenceofagrapeintheotherchamberwithoutanactualmonkeytoeatitwasenoughtoinduceresentmentinafemalecapuchin. Theresearcherssuggestthatcapuchinmonkeyslikehumansareguidedbysocialemotions.Inthewildtheyareaco-operativegroup-livingspecies.Suchco-operationislikelytobestableonlywheneachanimalfeelsitisnotbeingcheated.Feelingsofrighteousndignationitseemsarenotthepreserveofpeoplealone.Refusingalesserrewardcompletelymakesthesefeelingsabundantlycleartoothermembersofthegroup.Howeverwhethersuchasenseoffairnessevolvedindependentlyincapuchinsandhumansorwhetheritstemsfromthecommonancestorthatthespecieshad35millionyearsagoisasyetanunansweredquestion. Femalecapuchinmonkeyswerechosenfortheresearchmostprobablybecausetheyare
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.
与人体生长发育和生殖功能关系最为密切的是
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.
Doyourememberallthoseyearswhenscientistsarguedthatsmokingwouldkillusbutthedoubtersinsistedthatwedidn’tknowforsure?Thattheevidencewasinconclusivethescienceuncertain?Thattheantismokinglobbywasouttodestroyourwayoflifeandthegovernmentshouldstayoutoftheway?LotsofAmericansboughtthatnonsenseandoverthreedecadessome10millionsmokerswenttoearlygraves. Thereareupsettingparallelstodayasscientistsinonewaveafteranothertrytoawakenustothegrowingthreatofglobalwarming.ThelatestwasapanelfromtheNationalAcademyofSciencesenlistedbytheWhiteHousetotellusthattheEarth’satmosphereisdefinitelywarmingandthattheproblemislargelyman-made.Theclearmessageisthatweshouldgetmovingtoprotectourselves.ThepresidentoftheNationalAcademyBruceAlbertsaddedthiskeypointintheprefacetothepanel’sreport:Scienceneverhasalltheanswers.Butsciencedoesprovideuswiththebestavailableguidetothefutureanditiscriticalthatournationandtheworldbaseimportantpoliciesonthebestjudgmentsthatsciencecanprovideconcerningthefutureconsequencesofpresentactions. Justasonsmokingvoicesnowcomefrommanyquartersinsistingthatthescienceaboutglobalwarmingisincompletethatit’sOKtokeeppouringfumesintotheairuntilweknowforsure.Thisisadangerousgame:bythetime100percentoftheevidenceisinitmaybetoolate.Withtherisksobviousandgrowingaprudentpeoplewouldtakeoutaninsurancepolicynow. FortunatelytheWhiteHouseisstartingtopayattention.Butit’sobviousthatamajorityofthepresident’sadvisersstilldon’ttakeglobalwarmingseriously.Insteadofaplanofactiontheycontinuetopressformoreresearch―aclassiccaseofparalysisbyanalysis. Toserveasresponsiblestewardsoftheplanetwemustpressforwardondeeperatmosphericandoceanicresearch.Butresearchaloneisinadequate.IftheAdministrationwon’ttakethelegislativeinitiativeCongressshouldhelptobeginfashioningconservationmeasures.AbillbyDemocraticSenatorRobertByrdofWestVirginiawhichwouldofferfinancialincentivesforprivateindustryisapromisingstart.Manyseethatthecountryisgettingreadytobuildlotsofnewpowerplantstomeetourenergyneeds.Ifweareevergoingtoprotecttheatmosphereitiscrucialthatthosenewplantsbeenvironmentallysound. AccordingtotheauthorwhatshouldtheAdministrationdoaboutglobalwarming?
Everybodylovesafatpayrise.Yetpleasureatyourowncanvanishifyoulearnthatacolleaguehasbeengivenabiggerone.Indeedifhehasareputationforslackingyoumightevenbeoutraged.Suchbehaviourisregardedasalltoohumanwiththeunderlyingassumptionthatotheranimalswouldnotbecapableofthisfinelydevelopedsenseofgrievance.ButastudybySarahBrosnanandFransdeWaalofEmoryUniversityinAtlantaGeorgiawhichhasjustbeenpublishedinNaturesuggeststhatitisalltoomonkeyaswell. Theresearchersstudiedthebehaviouroffemalebrowncapuchinmonkeys.Theylookcute.Theyaregood-naturedco-operativecreaturesandtheysharetheirfoodreadily.Aboveallliketheirfemalehumancounterpartstheytendtopaymuchcloserattentiontothevalueofgoodsandservicesthanmales. SuchcharacteristicsmakethemperfectcandidatesforDr.Brosnan’sandDr.deWaal’sstudy.Theresearchersspenttwoyearsteachingtheirmonkeystoexchangetokensforfood.Normallythemonkeyswerehappyenoughtoexchangepiecesofrockforslicesofcucumber.Howeverwhentwomonkeyswereplacedinseparatebutadjoiningchamberssothateachcouldobservewhattheotherwasgettinginreturnforitsrocktheirbehaviourbecamemarkedlydifferent. Intheworldofcapuchinsgrapesareluxurygoodsandmuchpreferabletocucumbers.Sowhenonemonkeywashandedagrapeinexchangeforhertokenthesecondwasreluctanttohandhersoverforamerepieceofcucumber.Andifonereceivedagrapewithouthavingtoprovidehertokeninexchangeatalltheothereithertossedherowntokenattheresearcheroroutofthechamberorrefusedtoacceptthesliceofcucumber.Indeedthemerepresenceofagrapeintheotherchamberwithoutanactualmonkeytoeatitwasenoughtoinduceresentmentinafemalecapuchin. Theresearcherssuggestthatcapuchinmonkeyslikehumansareguidedbysocialemotions.Inthewildtheyareaco-operativegroup-livingspecies.Suchco-operationislikelytobestableonlywheneachanimalfeelsitisnotbeingcheated.Feelingsofrighteousndignationitseemsarenotthepreserveofpeoplealone.Refusingalesserrewardcompletelymakesthesefeelingsabundantlycleartoothermembersofthegroup.Howeverwhethersuchasenseoffairnessevolvedindependentlyincapuchinsandhumansorwhetheritstemsfromthecommonancestorthatthespecieshad35millionyearsagoisasyetanunansweredquestion. Whatcanweinferfromthelastparagraph?
用噬菌体P1进行普遍性转导供体菌的标记是pur+nad-pdx+受体菌的标记是put-nad+pdx-转导后选择具有pur+的转导子然后在1000个pur+转导子中检定其他供体菌的标记是否同时转导过来具体结果如下 请问 1．put和nad的共转导频率是多少 2．pur和pdx的共转导频率是多少 3．nad和pdx在pur的同一边还是在它的两侧 4．你能作出这三个标记基因的遗传连锁图吗请在此基础上解释上述的实验结果
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. Byreferringtothelimbicsystemtheauthorintendstoshow
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