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? ?阅读下面这篇短文，短文后有2项测试任务：(1)第23～26题要求从所给的6个选项中为第2～5段每段选择1个正确的小标题；(2)第27～30题要求从所给的6个选项中选择4个正确选项，分别完成每...
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? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为规定段每段选择1
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为规定段每段选择1
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2—5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第1～4段每段选
? ?阅读下面这篇短文短文后有2项测试任务1第23～26题要求从所给的6个选项中为第2～5段每段选
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DonthesitatetoletmeknowifthereisanythingIcandoforyou.
TheUnitedStates In1782【51】theUnitedStateswonitsindependencethebaldeaglewaschosen【52】thenationalbirdofthenewcountry.Americanleaderswantedtheeagletobea【53】oftheircountrybecauseit’’sabirdofstrengthandcourage.TheychosethebaldeaglebecauseitwasfoundalloverNorthAmericaandonlyinNorthAmerica. Butalittleover200years【54】thebaldeaglehadalmostdisappearedfromthecountryIn1972therewereonly3000baldeaglesintheentireUnitedStates.Thereasonforthebirds【55】populationwaspollutionespeciallypollutionofriversbypesticides.Pesticidesarechemicals【56】tokillinsectsandotheranimalsthatattackanddestroycrops. 【57】rainoftenwashespesticidesintorivers.Pesticidespollutetheriversandpoisonthefish.Eagleseat【58】andthepoison【59】theireggs.Theeggshaveverythinshellsanddonothatch. Eagles【60】onlytwoorthreeeggsayear.Becausemanyoftheeggsdidnot【61】andproducemoreeagles【62】eaglesquickly【63】smaller. TodaytheAmericanGovernmentandtheAmericanpeoplearetryingtoprotectthebaldeagle.Thenumberofbaldeagles【64】Itnowappears【65】theAmericannationalbirdwillsurviveandremainasymbolofstrengthandcourage.
Nurses Thephysiciansinahospitalformthecoreofthemedicalstaff.Buttheycouldnotprovideeffectivemedicalcaretotheirpatientswithoutthehelpofnumerousothermedicalworkers.Fromtheangleofthepatientsthenursingstaffisparticularlyimportant.Nursesareusuallyinclosecontactwithpatientsaslongastheyareinthehospital. Anursedoesnotstudyforasmanyyearsasadoctor.Howevereachmustbeequallytrained.Caringforsickpersonsrequiresagreatdealofpatienceandconcern.Mostnursesworklongdaysandtheyoftenmustworkatoddhoursorduringthenight. Thenursingstaffinahospitalisusuallyquitelargeandvarious.Nursingservicesafterallmustbeprovidedona24-hourbasis.Thereareprofessional专业的nursespracticalnursesnursesaidsandorderlies勤杂工.Thegeneraltermnursereferstoapersontrainedtoofferbedsidecaretosickpersons. Underthesupervision管理oftheheadnursethenursingstaffinahospitalwardmustattendtopatients’’needs.Thisresponsibilitycontinuesaroundtheclockandsonursesmustworkinshifts.Ashiftisaperiodofdutyusuallyeighthoursinlength.Thenursesonthewardrotate轮换theirshifts.Sometaketurnsworkingnightduty;othersworkoddshifts.Allofthemworkoutofacentralareaonthewardcalledthenursesstation. Anursemustalwaysbeonherguard.Shecanneveraffordtobecareless.Thisistrueinallnursingsituationsbutitisespeciallytrueintheintensivecareunit.Patientsunderintensivecarearecriticallyillandtheymustbemonitoredatalltimes.Thenurseswhodointensivecaredutyhaveoneofthemostdemandingjobsinthehospital. Nursesoftenearnasmuchmoneyasphysiciansdobecausetheytendtoworklongdaysandatoddhours.
OnAntibodies Substancesforeigntothebodysuchasdisease-causingbacteriaandvirusesandotherinfectiousagentsarerecognizedbythebodysimmunesystemasinvaders.Ournaturaldefensesagainsttheseinfectiousagentsareantibodiesproteinsthatseekouttheantigens抗原andhelpdestroythem. Antibodieshavetwoveryusefulcharacteristics.Firsttheyareextremelyspecific;thatiseachantibodybindstoandattacksoneparticularantigen.Secondsomeantibodiesonceactivatedbytheoccurrenceofadiseasecontinuetoconferresistanceagainstthatdisease.Classicexamplearetheantibodiestothechildhooddiseasesofchickenpox水痘andmeasles. Thesecondcharacteristicofantibodiesmakesitpossibletodevelopvaccines.Avaccine痘苗isapreparationofkilledorweakenedbacteriaorvirusesthatwhenintroducedintothebodystimulatestheproductionofantibodiesagainsttheantigensitcontains. Itisthefirsttraitofantibodiestheirspecificitythatmakesmonoclonalantibodytechnologysovaluable.Notonlycanantibodiesbeusedtherapeutically在治疗上toprotectagainstdisease;theycanalsohelpto.diagnoseawidevarietyofillnessesandcandetectthepresenceofdrugsviralandbacterialproductsandotherunusualorabnormalsubstancesintheblood. Givensuchadiversityofusesforthesediseased-fightingsubstancestheirproductioninpurequantitieshaslongbeenthefocusofscientificinvestigation.Theconventionalmethodwastoinjectalaboratoryanimalwithanantigenandthenafterantibodieshadbeenformedcollectthoseantibodiesfromthebloodserum血清Antibodycontainingbloodserumiscalledantiserum抗血清.Therearetwoproblemswiththismethod:Ityieldsantiserumthatcontainsundesiredsubstancesanditprovidesaverysmallamountofusableantibody. Monoclonalantibodytechnologyallowsustoproducelargeamountsofpureantibodies.inthefollowingway:wecanobtaincellsthatproduceantibodiesnaturally;wealsohaveavailableaclassofcellsthatcangrowcontinuallyincellculture培养.Ifweformahybrid混血儿thatcombinesthecharacteristicofimmortality永生withtheabilitytoproducethedesiredsubstancewewouldhaveineffectafactorytoproduceantibodiesthatworkaroundtheclock. Inmonoclonalantibodytechnologytumorcellsthatcanreplicate重复endlesslyarefusedwithmammaliancellsthatproduceanantibody.Theresultofthiscellfusionisahybridoma杂交瘤whichwillcontinuallyproduceantibodies.Theseantibodiesarecalledmonoclonalbecausetheycomefromonlyonetypeofcellthehybridomacell;antibodiesproducedbyconventionalmethodsontheotherhandarederivedfrompreparationscontainingmanykindsofcellsandhencearecalledpolyclonal.Anexampleofhowmonoclonalantibodiesarederivedisdescribedbelow. Amyelomaisatumorofthebonemarrow骨髓thatcanbeadaptedtogrowpermanendyincellculture.Whenmyelomacellswerefusedwithantibody-producingmammalianspleencellsitwasfoundthattheresultinghybridcellsorhybridomasproducedlargeamountsofmonoclonal骨髓瘤antibody.Thisproductofcellfusioncombinedthedesiredqualitiesofthetwodifferenttypesofcells:theabilitytogrowcontinuallyandtheabilitytoproducelargeamountsofpureantibody. Becauseselectedhybridcellsproduceonlyonespecificantibodytheyaremorepurethanthepolyclonalantibodiesproducedbyconventionaltechniques.Theyarepotentiallymoreeffectivethanconventionaldrugsinfightingdiseasesincedrugsattacknotonlytheforeignsubstancebutthebody’sowncellsaswellsometimesproducingundesirablesideeffectssuchasnausea恶心andallergicreactions.Monoclonalantibodiesattackthetargetmoleculeandonlythetargetmoleculewithnoorgreatlydiminishedsideeffects. Thepolyclonalantibodiesaredifferentfromthemonoclonalonesinallthefollowingwaysexceptthat______.
ModernDrugs Doctorssixtyyearsagocoulddolittletohelpvictimsofpolio.Seriouscasesusuallyendedindeath.In1955avaccinewasdevelopedthatpreventedthedisease.Todaypolioisnolongeramajorhealthproblem. Manyofthemostimportantdrugsthatdoctorsprescribetodayhavebeendevelopedinthelast30years.Moderndrugsarecomplexspecificandpowerful.Peopleneedtoknowmoreaboutdrugsinordertousethemsafely. Earlypeoplediscoveredbyaccidentthatsomeoftheplantsgrowingaroundthemseemedusefultohealsoresrelievepainorevencurediseases.Theseplantswerethefirstdrugs.Nowplantsarestillthesourceofsomedrugs.Quinineforexampleisabitter-tastingdrugusedtotreatthechillsandfeverofmalariaandtoreduceattacksofthedisease.ItismadefromthebarkofthecinchonatreewhichgrowsintheAndesMountains.TheIndiansofthatregionwerethefirsttousethebarkasamedicine.TheSpanishpeopleprobablybroughtittoEuropeintheearly1600s.Chemistslearnedhowtogetthepuredrugfromthebarkandin1944;itwasmadeartificiallyinthelaboratory. Otherimportantdrugssuchashormonesandvaccinesareobtainedfromanimals.Butmostofthemoderndrugscomefromchemicalcombinationsworkedoutbyresearchscientists.Mostpeopleneverseedrugsintheirsimpleformaschemicals.Insteadtheyareseenastabletscapsulesorliquidsthatcontainthedrugandotheringredients. Peopleusedrugstogetdifferentresults.Somedrugsattacktheorganismthatcausesadisease.Theycurebykillingtheorganism.Otherdrugsrelievewhatwecallthesymptomsofthedisease:theheadachepainfeverorchillsandmakethepatientmorecomfortable.Theseconstitutemostover-the-counterdrugs.Peoplecangetthemindrugstores. ConcerningthedrugquininewhichofthefollowingisNOTtrue?
ThepriceissomewhathigherthanIexpected.
TheUnitedStates In1782【51】theUnitedStateswonitsindependencethebaldeaglewaschosen【52】thenationalbirdofthenewcountry.Americanleaderswantedtheeagletobea【53】oftheircountrybecauseit’’sabirdofstrengthandcourage.TheychosethebaldeaglebecauseitwasfoundalloverNorthAmericaandonlyinNorthAmerica. Butalittleover200years【54】thebaldeaglehadalmostdisappearedfromthecountryIn1972therewereonly3000baldeaglesintheentireUnitedStates.Thereasonforthebirds【55】populationwaspollutionespeciallypollutionofriversbypesticides.Pesticidesarechemicals【56】tokillinsectsandotheranimalsthatattackanddestroycrops. 【57】rainoftenwashespesticidesintorivers.Pesticidespollutetheriversandpoisonthefish.Eagleseat【58】andthepoison【59】theireggs.Theeggshaveverythinshellsanddonothatch. Eagles【60】onlytwoorthreeeggsayear.Becausemanyoftheeggsdidnot【61】andproducemoreeagles【62】eaglesquickly【63】smaller. TodaytheAmericanGovernmentandtheAmericanpeoplearetryingtoprotectthebaldeagle.Thenumberofbaldeagles【64】Itnowappears【65】theAmericannationalbirdwillsurviveandremainasymbolofstrengthandcourage.
Throughaprocedureknownastime-sharingonelargecomputercanbeemployedsimultaneouslybylotsofsmallusers.
Istheclockinthetoweraccurate?
Theboywasseriouslywoundedintheaccident.
OnAntibodies Substancesforeigntothebodysuchasdisease-causingbacteriaandvirusesandotherinfectiousagentsarerecognizedbythebodysimmunesystemasinvaders.Ournaturaldefensesagainsttheseinfectiousagentsareantibodiesproteinsthatseekouttheantigens抗原andhelpdestroythem. Antibodieshavetwoveryusefulcharacteristics.Firsttheyareextremelyspecific;thatiseachantibodybindstoandattacksoneparticularantigen.Secondsomeantibodiesonceactivatedbytheoccurrenceofadiseasecontinuetoconferresistanceagainstthatdisease.Classicexamplearetheantibodiestothechildhooddiseasesofchickenpox水痘andmeasles. Thesecondcharacteristicofantibodiesmakesitpossibletodevelopvaccines.Avaccine痘苗isapreparationofkilledorweakenedbacteriaorvirusesthatwhenintroducedintothebodystimulatestheproductionofantibodiesagainsttheantigensitcontains. Itisthefirsttraitofantibodiestheirspecificitythatmakesmonoclonalantibodytechnologysovaluable.Notonlycanantibodiesbeusedtherapeutically在治疗上toprotectagainstdisease;theycanalsohelpto.diagnoseawidevarietyofillnessesandcandetectthepresenceofdrugsviralandbacterialproductsandotherunusualorabnormalsubstancesintheblood. Givensuchadiversityofusesforthesediseased-fightingsubstancestheirproductioninpurequantitieshaslongbeenthefocusofscientificinvestigation.Theconventionalmethodwastoinjectalaboratoryanimalwithanantigenandthenafterantibodieshadbeenformedcollectthoseantibodiesfromthebloodserum血清Antibodycontainingbloodserumiscalledantiserum抗血清.Therearetwoproblemswiththismethod:Ityieldsantiserumthatcontainsundesiredsubstancesanditprovidesaverysmallamountofusableantibody. Monoclonalantibodytechnologyallowsustoproducelargeamountsofpureantibodies.inthefollowingway:wecanobtaincellsthatproduceantibodiesnaturally;wealsohaveavailableaclassofcellsthatcangrowcontinuallyincellculture培养.Ifweformahybrid混血儿thatcombinesthecharacteristicofimmortality永生withtheabilitytoproducethedesiredsubstancewewouldhaveineffectafactorytoproduceantibodiesthatworkaroundtheclock. Inmonoclonalantibodytechnologytumorcellsthatcanreplicate重复endlesslyarefusedwithmammaliancellsthatproduceanantibody.Theresultofthiscellfusionisahybridoma杂交瘤whichwillcontinuallyproduceantibodies.Theseantibodiesarecalledmonoclonalbecausetheycomefromonlyonetypeofcellthehybridomacell;antibodiesproducedbyconventionalmethodsontheotherhandarederivedfrompreparationscontainingmanykindsofcellsandhencearecalledpolyclonal.Anexampleofhowmonoclonalantibodiesarederivedisdescribedbelow. Amyelomaisatumorofthebonemarrow骨髓thatcanbeadaptedtogrowpermanendyincellculture.Whenmyelomacellswerefusedwithantibody-producingmammalianspleencellsitwasfoundthattheresultinghybridcellsorhybridomasproducedlargeamountsofmonoclonal骨髓瘤antibody.Thisproductofcellfusioncombinedthedesiredqualitiesofthetwodifferenttypesofcells:theabilitytogrowcontinuallyandtheabilitytoproducelargeamountsofpureantibody. Becauseselectedhybridcellsproduceonlyonespecificantibodytheyaremorepurethanthepolyclonalantibodiesproducedbyconventionaltechniques.Theyarepotentiallymoreeffectivethanconventionaldrugsinfightingdiseasesincedrugsattacknotonlytheforeignsubstancebutthebody’sowncellsaswellsometimesproducingundesirablesideeffectssuchasnausea恶心andallergicreactions.Monoclonalantibodiesattackthetargetmoleculeandonlythetargetmoleculewithnoorgreatlydiminishedsideeffects. Allthefollowingstatementsaboutantibodiesaretrueexcept______.
ModernDrugs Doctorssixtyyearsagocoulddolittletohelpvictimsofpolio.Seriouscasesusuallyendedindeath.In1955avaccinewasdevelopedthatpreventedthedisease.Todaypolioisnolongeramajorhealthproblem. Manyofthemostimportantdrugsthatdoctorsprescribetodayhavebeendevelopedinthelast30years.Moderndrugsarecomplexspecificandpowerful.Peopleneedtoknowmoreaboutdrugsinordertousethemsafely. Earlypeoplediscoveredbyaccidentthatsomeoftheplantsgrowingaroundthemseemedusefultohealsoresrelievepainorevencurediseases.Theseplantswerethefirstdrugs.Nowplantsarestillthesourceofsomedrugs.Quinineforexampleisabitter-tastingdrugusedtotreatthechillsandfeverofmalariaandtoreduceattacksofthedisease.ItismadefromthebarkofthecinchonatreewhichgrowsintheAndesMountains.TheIndiansofthatregionwerethefirsttousethebarkasamedicine.TheSpanishpeopleprobablybroughtittoEuropeintheearly1600s.Chemistslearnedhowtogetthepuredrugfromthebarkandin1944;itwasmadeartificiallyinthelaboratory. Otherimportantdrugssuchashormonesandvaccinesareobtainedfromanimals.Butmostofthemoderndrugscomefromchemicalcombinationsworkedoutbyresearchscientists.Mostpeopleneverseedrugsintheirsimpleformaschemicals.Insteadtheyareseenastabletscapsulesorliquidsthatcontainthedrugandotheringredients. Peopleusedrugstogetdifferentresults.Somedrugsattacktheorganismthatcausesadisease.Theycurebykillingtheorganism.Otherdrugsrelievewhatwecallthesymptomsofthedisease:theheadachepainfeverorchillsandmakethepatientmorecomfortable.Theseconstitutemostover-the-counterdrugs.Peoplecangetthemindrugstores. Whatisthemainideaofthispassage?
ViceVaccines Atfirstglancevicevaccineslookjustgreat.Theseinjectionspromisetoinactivatedrugssuchascocaineheroinandnicotineinthebloodstreambeforetheyreachthebrain.Withoutthehitpeoplejustwon’’tcomebackformore. It’’struethatthesevaccinesarestillbeingdevelopedsotheirfullrisksandbenefitsarenotyetclear.Butallthesignsarethatforpeoplewhoareindangerofoverdosingorforaddictswhowanttogetthemselvescleanbutneedsomehelptoovercometheircravingthevaccineswillbeimmenselyvaluable. Butlikemanynewtechnologiestheyalsobringdifficultchoices.Willconvictedcriminalswhostealtofeedtheirdrughabitbeallowedbackontothestreetiftheyagreetobevaccinatedforexample?Couldajudgeevencompelthesepeopletobevaccinated? Perhapsthemostcontroversialdebatethatvicevaccineshaveraisediswhethertheyshouldbegivenroutinelytochildrenlikepolioormeaslesvaccines.Thisis.notadistantworry.Nosoonertheyhavefoundthemselvessubmergedwithrequestsfromworriedparentswhowanttheirchildrenvaccinated.Isthisreallywhatwewantforfuturegenerations? Foranysocietythatvaluespersonalfreedomtheanswerhastobeno.Peoplehavetherighttochoosehowtobehavewhetherit’’sgoodorbadlegalornot.Letnotignorethefactthatmillionsofpeopletakeillegaldrugsforpleasurewithoutbecomingaddicted.Administeringvicevaccineswillmeanthatyoungstersarenolongerfreetomakesuchchoicesforthemselves.ItwouldbelikeareturntoPleasantvile. Andrememberwe’’rejusttalkingaboutillegaldrugshere.Onevaccineunderdevelopmentactsagainstnicotineandifitsnicotinetodaywhynotcaffeinetomorrow?Society’’sattitudestodrugschange.Fortyyearsagosmokingwasfine.AcenturyagoAmericanshipoperatorsweregivingstevedores码头工人cocainetospeeduptheirwork. Likeitornotpeoplehavebeentakingmind-alteringchemicalssincebeforerecordedhistory.Eachvaccineactsonlyagainstaspecificdrugandstoppingpeoplegettinghighononedrugwillsimplypushthemtotakeothers—asaddictionresearchershavealreadyfound.Sodrugusewon’’tgoawaythedrugswilljustchange. Opposingthewidespreaduseofvicevaccinesforyoungstersisnottoadvocatedruguse.Byallmeansletvicevaccinessparkarevolutionindetox解毒clinics.Butwhenitcomestohelpingchildrendealwithdrugsthewaytohelpthemisthrougheducationensuringthattheycanfollowlifestylesthatareincompatiblewithdrugtakingandgivingthemthetoolstospotrisksandmakeinformedchoices. Theproblemofdrugabuseisboundupwithmodernsocietyincomplexways.Simplechemicalsolutionsareunlikelytoprovidethewholeanswer. Thewordhitinthefirstparagraphrefersto______.
Theeconomicreforminthatcountryhasbeenaccelerated.
Nurses Thephysiciansinahospitalformthecoreofthemedicalstaff.Buttheycouldnotprovideeffectivemedicalcaretotheirpatientswithoutthehelpofnumerousothermedicalworkers.Fromtheangleofthepatientsthenursingstaffisparticularlyimportant.Nursesareusuallyinclosecontactwithpatientsaslongastheyareinthehospital. Anursedoesnotstudyforasmanyyearsasadoctor.Howevereachmustbeequallytrained.Caringforsickpersonsrequiresagreatdealofpatienceandconcern.Mostnursesworklongdaysandtheyoftenmustworkatoddhoursorduringthenight. Thenursingstaffinahospitalisusuallyquitelargeandvarious.Nursingservicesafterallmustbeprovidedona24-hourbasis.Thereareprofessional专业的nursespracticalnursesnursesaidsandorderlies勤杂工.Thegeneraltermnursereferstoapersontrainedtoofferbedsidecaretosickpersons. Underthesupervision管理oftheheadnursethenursingstaffinahospitalwardmustattendtopatients’’needs.Thisresponsibilitycontinuesaroundtheclockandsonursesmustworkinshifts.Ashiftisaperiodofdutyusuallyeighthoursinlength.Thenursesonthewardrotate轮换theirshifts.Sometaketurnsworkingnightduty;othersworkoddshifts.Allofthemworkoutofacentralareaonthewardcalledthenursesstation. Anursemustalwaysbeonherguard.Shecanneveraffordtobecareless.Thisistrueinallnursingsituationsbutitisespeciallytrueintheintensivecareunit.Patientsunderintensivecarearecriticallyillandtheymustbemonitoredatalltimes.Thenurseswhodointensivecaredutyhaveoneofthemostdemandingjobsinthehospital. Thenurse’sstationistheonlyplacewherenursesinahospitalwardcanbefound.
TheUnitedStates In1782【51】theUnitedStateswonitsindependencethebaldeaglewaschosen【52】thenationalbirdofthenewcountry.Americanleaderswantedtheeagletobea【53】oftheircountrybecauseit’’sabirdofstrengthandcourage.TheychosethebaldeaglebecauseitwasfoundalloverNorthAmericaandonlyinNorthAmerica. Butalittleover200years【54】thebaldeaglehadalmostdisappearedfromthecountryIn1972therewereonly3000baldeaglesintheentireUnitedStates.Thereasonforthebirds【55】populationwaspollutionespeciallypollutionofriversbypesticides.Pesticidesarechemicals【56】tokillinsectsandotheranimalsthatattackanddestroycrops. 【57】rainoftenwashespesticidesintorivers.Pesticidespollutetheriversandpoisonthefish.Eagleseat【58】andthepoison【59】theireggs.Theeggshaveverythinshellsanddonothatch. Eagles【60】onlytwoorthreeeggsayear.Becausemanyoftheeggsdidnot【61】andproducemoreeagles【62】eaglesquickly【63】smaller. TodaytheAmericanGovernmentandtheAmericanpeoplearetryingtoprotectthebaldeagle.Thenumberofbaldeagles【64】Itnowappears【65】theAmericannationalbirdwillsurviveandremainasymbolofstrengthandcourage.
ViceVaccines Atfirstglancevicevaccineslookjustgreat.Theseinjectionspromisetoinactivatedrugssuchascocaineheroinandnicotineinthebloodstreambeforetheyreachthebrain.Withoutthehitpeoplejustwon’’tcomebackformore. It’’struethatthesevaccinesarestillbeingdevelopedsotheirfullrisksandbenefitsarenotyetclear.Butallthesignsarethatforpeoplewhoareindangerofoverdosingorforaddictswhowanttogetthemselvescleanbutneedsomehelptoovercometheircravingthevaccineswillbeimmenselyvaluable. Butlikemanynewtechnologiestheyalsobringdifficultchoices.Willconvictedcriminalswhostealtofeedtheirdrughabitbeallowedbackontothestreetiftheyagreetobevaccinatedforexample?Couldajudgeevencompelthesepeopletobevaccinated? Perhapsthemostcontroversialdebatethatvicevaccineshaveraisediswhethertheyshouldbegivenroutinelytochildrenlikepolioormeaslesvaccines.Thisis.notadistantworry.Nosoonertheyhavefoundthemselvessubmergedwithrequestsfromworriedparentswhowanttheirchildrenvaccinated.Isthisreallywhatwewantforfuturegenerations? Foranysocietythatvaluespersonalfreedomtheanswerhastobeno.Peoplehavetherighttochoosehowtobehavewhetherit’’sgoodorbadlegalornot.Letnotignorethefactthatmillionsofpeopletakeillegaldrugsforpleasurewithoutbecomingaddicted.Administeringvicevaccineswillmeanthatyoungstersarenolongerfreetomakesuchchoicesforthemselves.ItwouldbelikeareturntoPleasantvile. Andrememberwe’’rejusttalkingaboutillegaldrugshere.Onevaccineunderdevelopmentactsagainstnicotineandifitsnicotinetodaywhynotcaffeinetomorrow?Society’’sattitudestodrugschange.Fortyyearsagosmokingwasfine.AcenturyagoAmericanshipoperatorsweregivingstevedores码头工人cocainetospeeduptheirwork. Likeitornotpeoplehavebeentakingmind-alteringchemicalssincebeforerecordedhistory.Eachvaccineactsonlyagainstaspecificdrugandstoppingpeoplegettinghighononedrugwillsimplypushthemtotakeothers—asaddictionresearchershavealreadyfound.Sodrugusewon’’tgoawaythedrugswilljustchange. Opposingthewidespreaduseofvicevaccinesforyoungstersisnottoadvocatedruguse.Byallmeansletvicevaccinessparkarevolutionindetox解毒clinics.Butwhenitcomestohelpingchildrendealwithdrugsthewaytohelpthemisthrougheducationensuringthattheycanfollowlifestylesthatareincompatiblewithdrugtakingandgivingthemthetoolstospotrisksandmakeinformedchoices. Theproblemofdrugabuseisboundupwithmodernsocietyincomplexways.Simplechemicalsolutionsareunlikelytoprovidethewholeanswer. Thispassageimpliesthat______.
Manyproblemsthatbotheredpeoplethencontinuetoexisttoday.
ViceVaccines Atfirstglancevicevaccineslookjustgreat.Theseinjectionspromisetoinactivatedrugssuchascocaineheroinandnicotineinthebloodstreambeforetheyreachthebrain.Withoutthehitpeoplejustwon’’tcomebackformore. It’’struethatthesevaccinesarestillbeingdevelopedsotheirfullrisksandbenefitsarenotyetclear.Butallthesignsarethatforpeoplewhoareindangerofoverdosingorforaddictswhowanttogetthemselvescleanbutneedsomehelptoovercometheircravingthevaccineswillbeimmenselyvaluable. Butlikemanynewtechnologiestheyalsobringdifficultchoices.Willconvictedcriminalswhostealtofeedtheirdrughabitbeallowedbackontothestreetiftheyagreetobevaccinatedforexample?Couldajudgeevencompelthesepeopletobevaccinated? Perhapsthemostcontroversialdebatethatvicevaccineshaveraisediswhethertheyshouldbegivenroutinelytochildrenlikepolioormeaslesvaccines.Thisis.notadistantworry.Nosoonertheyhavefoundthemselvessubmergedwithrequestsfromworriedparentswhowanttheirchildrenvaccinated.Isthisreallywhatwewantforfuturegenerations? Foranysocietythatvaluespersonalfreedomtheanswerhastobeno.Peoplehavetherighttochoosehowtobehavewhetherit’’sgoodorbadlegalornot.Letnotignorethefactthatmillionsofpeopletakeillegaldrugsforpleasurewithoutbecomingaddicted.Administeringvicevaccineswillmeanthatyoungstersarenolongerfreetomakesuchchoicesforthemselves.ItwouldbelikeareturntoPleasantvile. Andrememberwe’’rejusttalkingaboutillegaldrugshere.Onevaccineunderdevelopmentactsagainstnicotineandifitsnicotinetodaywhynotcaffeinetomorrow?Society’’sattitudestodrugschange.Fortyyearsagosmokingwasfine.AcenturyagoAmericanshipoperatorsweregivingstevedores码头工人cocainetospeeduptheirwork. Likeitornotpeoplehavebeentakingmind-alteringchemicalssincebeforerecordedhistory.Eachvaccineactsonlyagainstaspecificdrugandstoppingpeoplegettinghighononedrugwillsimplypushthemtotakeothers—asaddictionresearchershavealreadyfound.Sodrugusewon’’tgoawaythedrugswilljustchange. Opposingthewidespreaduseofvicevaccinesforyoungstersisnottoadvocatedruguse.Byallmeansletvicevaccinessparkarevolutionindetox解毒clinics.Butwhenitcomestohelpingchildrendealwithdrugsthewaytohelpthemisthrougheducationensuringthattheycanfollowlifestylesthatareincompatiblewithdrugtakingandgivingthemthetoolstospotrisksandmakeinformedchoices. Theproblemofdrugabuseisboundupwithmodernsocietyincomplexways.Simplechemicalsolutionsareunlikelytoprovidethewholeanswer. Accordingtothewriteroneofthedisadvantagesofvicevaccineisthat______.
Nurses Thephysiciansinahospitalformthecoreofthemedicalstaff.Buttheycouldnotprovideeffectivemedicalcaretotheirpatientswithoutthehelpofnumerousothermedicalworkers.Fromtheangleofthepatientsthenursingstaffisparticularlyimportant.Nursesareusuallyinclosecontactwithpatientsaslongastheyareinthehospital. Anursedoesnotstudyforasmanyyearsasadoctor.Howevereachmustbeequallytrained.Caringforsickpersonsrequiresagreatdealofpatienceandconcern.Mostnursesworklongdaysandtheyoftenmustworkatoddhoursorduringthenight. Thenursingstaffinahospitalisusuallyquitelargeandvarious.Nursingservicesafterallmustbeprovidedona24-hourbasis.Thereareprofessional专业的nursespracticalnursesnursesaidsandorderlies勤杂工.Thegeneraltermnursereferstoapersontrainedtoofferbedsidecaretosickpersons. Underthesupervision管理oftheheadnursethenursingstaffinahospitalwardmustattendtopatients’’needs.Thisresponsibilitycontinuesaroundtheclockandsonursesmustworkinshifts.Ashiftisaperiodofdutyusuallyeighthoursinlength.Thenursesonthewardrotate轮换theirshifts.Sometaketurnsworkingnightduty;othersworkoddshifts.Allofthemworkoutofacentralareaonthewardcalledthenursesstation. Anursemustalwaysbeonherguard.Shecanneveraffordtobecareless.Thisistrueinallnursingsituationsbutitisespeciallytrueintheintensivecareunit.Patientsunderintensivecarearecriticallyillandtheymustbemonitoredatalltimes.Thenurseswhodointensivecaredutyhaveoneofthemostdemandingjobsinthehospital. Thenursesinahospitalusuallyspendmoretimewiththepatientsthanthephysicians.
Thechairmanproposedthatweshouldstopthemeeting.
ModernDrugs Doctorssixtyyearsagocoulddolittletohelpvictimsofpolio.Seriouscasesusuallyendedindeath.In1955avaccinewasdevelopedthatpreventedthedisease.Todaypolioisnolongeramajorhealthproblem. Manyofthemostimportantdrugsthatdoctorsprescribetodayhavebeendevelopedinthelast30years.Moderndrugsarecomplexspecificandpowerful.Peopleneedtoknowmoreaboutdrugsinordertousethemsafely. Earlypeoplediscoveredbyaccidentthatsomeoftheplantsgrowingaroundthemseemedusefultohealsoresrelievepainorevencurediseases.Theseplantswerethefirstdrugs.Nowplantsarestillthesourceofsomedrugs.Quinineforexampleisabitter-tastingdrugusedtotreatthechillsandfeverofmalariaandtoreduceattacksofthedisease.ItismadefromthebarkofthecinchonatreewhichgrowsintheAndesMountains.TheIndiansofthatregionwerethefirsttousethebarkasamedicine.TheSpanishpeopleprobablybroughtittoEuropeintheearly1600s.Chemistslearnedhowtogetthepuredrugfromthebarkandin1944;itwasmadeartificiallyinthelaboratory. Otherimportantdrugssuchashormonesandvaccinesareobtainedfromanimals.Butmostofthemoderndrugscomefromchemicalcombinationsworkedoutbyresearchscientists.Mostpeopleneverseedrugsintheirsimpleformaschemicals.Insteadtheyareseenastabletscapsulesorliquidsthatcontainthedrugandotheringredients. Peopleusedrugstogetdifferentresults.Somedrugsattacktheorganismthatcausesadisease.Theycurebykillingtheorganism.Otherdrugsrelievewhatwecallthesymptomsofthedisease:theheadachepainfeverorchillsandmakethepatientmorecomfortable.Theseconstitutemostover-the-counterdrugs.Peoplecangetthemindrugstores. Theover-the-counterdrugsarethosethat______.
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