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Foreign military aid was {{U}}prolonging{{/U}} the war.
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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?
HeartAttack IntheUnitedStatesandespeciallyinbigcitiesandruralareastensofthousandsofpeoplewithheartsthatshouldbegood【51】tokeepthemalivedieeachyearforlackofadequatefirstaid.InNewYorkCityforexampleanewstudyhasshownthatonlyonepersonin100outsideofhospitals【52】aftertheheartsuddenlystopspumping.IncontrastinSeattlethesurvival【53】aftersuchheartattacksisoneinfive. Thedifferencecanbetraced【54】theeffectivenessofthechainofsurvivalDr.JosephP.Ornatosaid.Eachlinkinthe【55】mustbestrongenoughformanylivestobe【56】. Thechainbeginswithanimmediatetelephone【57】foremergencyhelpandthestartwithinfourminutesoftheprocessneededforrestartingthe【58】workingbyafamilymemberorbystander旁观者. Itcontinueswiththepromptarrival-------withineight【59】tenminutesofarescuerequippedwithaspecialinstrumentthatcanshocktheheartbacktoanormalrhythm.Anditendswiththeadministration给予实施ofadvanced先进emergencycarebynursestomaintaintheheart’’sabilitytosurviveuntilthedoctorsatthehospitalscantake【60】Whenoneormorelinksinthischainfailorfunctiontooslowlythe【61】ofavictimsurvivingheartattackfallsrapidly.Becauseofwidespreadweaknessesinthechainof【62】expertsinemergencyheartcareestimatethat20000to80000people【63】needlesslyofheartattackeachyearanumbercomparabletothe55000killedannuallyinautomobile【64】. OneexpertsaysSendinganemergencyvehicletoaheartattackvictim【65】thespecialequipmentislikehavingpolicemenwithgunsbutnobullets.Theymayputonagoodshowbuttheylacktheweaponneededtogetthejobdone.
UnitedNations AmajorsegmentoftheUntiedNationsistheGeneralAssemblywhichconsistsofrepresentativesfromallgovernmentsthathaveratifiedtheUNCharter.Asof1995185stateshadmembershipinthegeneralAssembly.AdditionallytheVaticanSwitzerlandandthePalestineLiberationOrganizationhavenonvotingobserverstatusintheGeneralAssembly.TheGeneralAssemblyapprovestheUN’’sbudgetactswiththeSecurityCounciltoselecttheSecretary-generalandjudgesoftheInternationalCourtofJusticeandpassesresolutionsonissuesrangingfromself-determinationandcolonialismtowomen’’srightsandtheglobaldistributionofwealth. TheGeneralAssemblycanmeetandvoteonanysubjectunlesstheSecurityCouncilisdealingwithitoratleastpretendingto.Howeveritsdecisionsonlycarrymoralforce—unliketheCouncil’’s.They’’renotbindingininternationallaws.ButtheAssemblyvotesareanimportantopinionpollonhowandwhatthemajorityoftheworldthinksaboutissues.Importantquestionsneedatwo-thirdsvoteoftheAssemblytopass. Thequestionofwhatisanimportantquestionisn’’timportant.Itsdecidedbythedelegatesthemselves—byasimplemajority. AlthoughtheGeneralAssemblyhasnotrecognizedauthoritytoenforceitsconclusionsonanythingotherthaninternalUNmattersitmakesitsviewpointsonissuesthatarebroughtbeforeitisknowninoneofthethreeways.AGeneralAssemblydeclarationisabroadstatementofgeneralprinciplesuchastheUniversalDeclarationofHumanRightspassedin1948.Declarationsareoftenputforwardasanexpressionofanidealinpracticetheyareregularlyignored.AGeneralAssemblyresolutionisessentiallyadocumentthatrecommendsthatmemberstatestakeaparticularpolicyaction.StatesclaimsovereigntyandmaketheirowndecisionsastowhethertheywillfollowaGeneralAssemblyresolution.Insomecaseshoweverifmanystatesimplementaparticularresolutionotherstatesthatmaynotwishtoactontheresolutionmayfeelthemselvespressuredtodosoanyway.Attheveryleastaresolutionhastheeffectoflegitimizingthepoliciesofthosestatesthatwishtocomplywiththeresolution.FinallyaGeneralAssemblyconventionortreatyhastwomeanings.ThemorecomprehensiveconventionreferstomultilateraltreatiesvotedonbytheGeneralAssemblythatuponpassagebytheGeneralAssemblyarecarriedbacktothecapitalsofmemberstatesforratificationbywhatevermeanseachstateusesdomestically.InothercasesaGeneralAssemblyconventionrefersspecificallytoatreatysignedbetweentheUnitedNationsandthegovernmentofanation-stateaswhenin1956EgyptagreedtoallowUnitedNationspeacekeepingforcestoenterEgyptianterritory. TheGeneralAssemblymakesitsviewpointsintheGeneralAssemblyratification.
Interferon Forseveralyearsscientistshavebeentestingasubstancecalledinterferon干扰素apotentialwonderdrugthatisprovingtobeeffectiveintreatingavarietyofailmentsincludingvirusinfectionsbacteriainfectionsandtumors.Todatethenewdrughasprovokednonegativereactionofsufficientsignificancetodiscourageitsuse.Butinspiteofitssuccesslastyearonlyonegramwasproducedintheentireworld. Thereasonforthescarcityliesinthestructureofinterferon.Aspeciesspecificproteintheinterferonproducedfromoneanimalspeciescannotbeusedintreatinganotheranimalspecies.Inotherwordstotreathumanbeingsonlyinterferonproducedbyhumanbeingsmaybeused.Thedrugisproducedbyinfectingwhitebloodcellswithavirus.Fortunatelyitissopotentthattheamountgiveneachpatientperinjectionisverysmall. Unlikeantibiotics抗菌素interferondoesnotattackgermsdirectly.Insteaditmakesunaffectedcellsresistanttoinfectionandpreventsthemultiplicationofviruseswithincells. Asyoumightconcludeoneofthemostdramaticusesofinterferonhasbeeninthetreatmentofcancer.Dr.HansStranderresearchphysicianatSweden’’sfamousKarolinskaInstitutehastreatedmorethanonehundredcancerpatientswiththenewdrug.Amongagroupofselectedpatientswhohadundergonesurgicalproceduresforadvancedcancerhalfweregivenconventionaltreatmentsandtheotherhalfweregiveninterferon.Thesurvivalrateoverathree-yearperiodwas70percentamongthosewhoweretreatedwithinterferonascomparedwithonly10to30percentamongthosewhohadreceivedtheconventionaltreatments. IntheUnitedStatesalarge-scaleprojectsupportedbytheAmericanCancerSocietyisnowunderway.Iftheexperimentissuccessfulinterferoncouldbecomeoneofthegreatestmedicaldiscoveriesofourtime. 21Interferoncauseshealthycellstogrow.
HeartAttack IntheUnitedStatesandespeciallyinbigcitiesandruralareastensofthousandsofpeoplewithheartsthatshouldbegood【51】tokeepthemalivedieeachyearforlackofadequatefirstaid.InNewYorkCityforexampleanewstudyhasshownthatonlyonepersonin100outsideofhospitals【52】aftertheheartsuddenlystopspumping.IncontrastinSeattlethesurvival【53】aftersuchheartattacksisoneinfive. Thedifferencecanbetraced【54】theeffectivenessofthechainofsurvivalDr.JosephP.Ornatosaid.Eachlinkinthe【55】mustbestrongenoughformanylivestobe【56】. Thechainbeginswithanimmediatetelephone【57】foremergencyhelpandthestartwithinfourminutesoftheprocessneededforrestartingthe【58】workingbyafamilymemberorbystander旁观者. Itcontinueswiththepromptarrival-------withineight【59】tenminutesofarescuerequippedwithaspecialinstrumentthatcanshocktheheartbacktoanormalrhythm.Anditendswiththeadministration给予实施ofadvanced先进emergencycarebynursestomaintaintheheart’’sabilitytosurviveuntilthedoctorsatthehospitalscantake【60】Whenoneormorelinksinthischainfailorfunctiontooslowlythe【61】ofavictimsurvivingheartattackfallsrapidly.Becauseofwidespreadweaknessesinthechainof【62】expertsinemergencyheartcareestimatethat20000to80000people【63】needlesslyofheartattackeachyearanumbercomparabletothe55000killedannuallyinautomobile【64】. OneexpertsaysSendinganemergencyvehicletoaheartattackvictim【65】thespecialequipmentislikehavingpolicemenwithgunsbutnobullets.Theymayputonagoodshowbuttheylacktheweaponneededtogetthejobdone.
MaleandFemalepilotscauseaccidentsdifferently MalepilotsflyinggeneralaviationprivateaircraftintheUnitedStatesaremorelikelytocrashduetoinattentionorflaweddecisionmakingwhilefemalepilotsaremorelikelytocrashfrommishandlingtheaircraft.ThesearetheresultsofastudybyresearchersattheJohnsHopkinsUniversityBloombergSchoolofPublicHealth. Thestudyidentifiesthedifferencesbetweenmaleandfemalepilotsintermsofcircumstancesofthecrashandthetypeofpilotserrorinvolved.Crashesofgeneralaviationaircraftaccountfor85percentofallaviationdeathsintheUnitedStates.ThecrashrateformalepilotsasformotorvehicledriversexceedsthatofcrashesoffemalepilotsexplainsSusanP.BakerMPHprofessorofhealthpolicyandmanagementattheBloombergSchoolofPublicHealth.Becausepilotyouthandinexperienceareestablishedcontributorstoaviationcrasheswefocusedononlymaturepilotstodeterminethegenderdifferencesinthereasonsforthecrash. Theresearchersextracteddataforthisstudyfromalargeresearchprojectonpilotagingandflightsafety.Thedataweregatheredfromgeneralaviationcrashesofairplanesandhelicoptersbetween1983and1997involving144femalepilotsand267malepilotsaged40-63.Femalepilotswerematchedwithmalepilotsina1:2ratiobyageclassesofmedicalandpilotcertificatesstateorareaofcrashandyearofcrash.Thenthecircumstancesofthecrashesandthepiloterrorinvolvedwerecategorizedandcodedwithoutknowledgeofpilotgender. Theresearchersfoundthatlossofcontrolonlandingortakeoffwasthemostcommoncircumstanceforbothsexesleadingto59percentoffemalepilots’crashesand36percentofmales’’.Experiencingmechanicalfailurerunningoutoffuelandlandingtheplanewiththelandinggearupwereamongthefactorsmorelikelywithmaleswhilestallingwasmorelikelywithfemales. Themajorityofthecrashes—95percentforfemalesand88percentformales—involvedatleastonetypeofpiloterror.Mishandlingaircraftkineticswasthemostcommonerrorforbothsexesbutwasmorecommonamongfemalesaccountingfor81percentofthecrashesthanmalesaccountingfor48percent.Maleshoweverappearedmorelikelytobeguiltyofpoordecision-makingrisk-takingandinattentivenessexamplesofwhichincludemisjudgingweatherandvisibilityorflyinganaircraftwithaknowndefect.Femalesthoughmorelikelytomishandleorlosecontroloftheaircraftweregenerallymorecarefulthantheirmalecounterparts. inattention/n.疏忽 aviation/n.航空 flawed/adj.有缺陷的 mishandle/v.瞎弄乱处理 MPHMasterofPublicHealth公共卫生硕士 gender/n.性性别 runout耗尽用完 stallv.飞机失速发动机熄火 kinetics/n.动力学 Howdidtheresearcherscarryouttheirstudy?
PrematureSmoking:ASeriousProblem ThethirdreportonsmokingandhealthfromtheRoyalCollegeofPhysicianswhichwaspublishedthismonthcontainsimportantnewsectionsonthesmokinghabitsofchildrenandthepossibleeffectontheirfuturehealth. Theseincludeatwentyfoldintheincreaseintheriskoflungcancerinheavysmokersandanincreaseofaboutthreeandahalftimesintheriskofdyingfromcoronary冠状的heartdisease;chronic慢性的oronchitis支气管炎andemphysema肺气肿arealsomuchcommoner.Teachersplayanimportantpartindeterminingtheattitudeofchildrentosmokingwhetherornotthechildrenstarttosmokeandinprovidingknowledgeabouttheconsequencesofsmoking. WheneverIseechildrenofschoolageopenlysmokinginpublicIwonderwhethertheyreallyunderstandwhattheyaredoing.Probablymostdonot.Iatleastknowthatmyclinicalpracticeinlungdiseasewillnotbeshortofpatientsfortherestofmyworkinglife.About34percentofboysaged15smokeandtwothirdsofthisnumberofgirls.Overthepasttenyearstherehasbeenasmallbutwelcomereductioninthenumberofboyswhosmokeatthisagebutanincreaseinthenumberofgirls. Onelargestudyhasshownthatofthosechildrenwhosmokemorethanonecigaretteasmanyas85percentbecomehabitual习惯的smokers.Thisispartlybecausenicotineisoneofthemostdependent—producingdrugsknownonaparwithheroinandotherharddrugsinthisrespect.Oneinthreesmokersstartbeforetheageofninesomeevenasyoungasfive. Thecausesofprematuredeathwhichone-thirdofsmokerswillsufferandoftheprolongedillnesseswhichaffectsomanyofthemaredescribedinthereport;itsenoughtosaythattheyoungerachildstartstosmokethegreaterarehischancesofdyingearly. Ithasbeenshownthatchildrenwhosmokehavecertaincharacteristics.Comparedwithnonsmokerstheyaremorerebellious__的theirworkdeteriorates使变坏astheymoveupschooltheyaremorelikelytoleaveschoolearlyandaremoreoftendelinquent违法的andsexually性的precocious早熟.Manyofthesefeaturescanbesummarizedasanticipationofadulthood. Thereareanumberoffactorswhichdeterminetheonset开始ofsmokingandthesearelargelypsychologicalandsocial.Theyincludeavailabilityofcigarettescuriosityrebelliousnessappearingtoughanticipationofadulthoodsocialconfidenceexampleofparentsandteachersandsmokingbyfriendsandolderbrothersandsisters. Itshouldbemucheasiertopreventchildrenfromstartingtosmokethantopersuadesadultstogiveupthehabitonceestablishedbutinfactthishasprovedverydifficult.Theexamplesetbypeopleinauthorityespeciallyparentshealthcareworkersandteachersisofprimeimportance.Schoolrulesshouldforbidsmokingbychildrenonthepremises场所.ThisrulehasevenbeenintroducedatSummerhillSchoolwhereIspentmyschooldays. Thereishoweverariskofchildrensmokingjusttorebelagainsttherulesandeveninthoseschoolswhichhavetriedtoenforcenosmokingbycorporeal肉体的punishmentthereismuchsmokingasinotherschoolsNeverthelessbanningsmokingisprobablyonbalancebeneficial.Teacherstooshouldnotsmokeonschoolpremisesatleastnotinfrontofchildren. Peoplewhosmokeheavily______.
Hehadbeenforcedtogiveupmuchofhistimetohousework.
MaleandFemalepilotscauseaccidentsdifferently MalepilotsflyinggeneralaviationprivateaircraftintheUnitedStatesaremorelikelytocrashduetoinattentionorflaweddecisionmakingwhilefemalepilotsaremorelikelytocrashfrommishandlingtheaircraft.ThesearetheresultsofastudybyresearchersattheJohnsHopkinsUniversityBloombergSchoolofPublicHealth. Thestudyidentifiesthedifferencesbetweenmaleandfemalepilotsintermsofcircumstancesofthecrashandthetypeofpilotserrorinvolved.Crashesofgeneralaviationaircraftaccountfor85percentofallaviationdeathsintheUnitedStates.ThecrashrateformalepilotsasformotorvehicledriversexceedsthatofcrashesoffemalepilotsexplainsSusanP.BakerMPHprofessorofhealthpolicyandmanagementattheBloombergSchoolofPublicHealth.Becausepilotyouthandinexperienceareestablishedcontributorstoaviationcrasheswefocusedononlymaturepilotstodeterminethegenderdifferencesinthereasonsforthecrash. Theresearchersextracteddataforthisstudyfromalargeresearchprojectonpilotagingandflightsafety.Thedataweregatheredfromgeneralaviationcrashesofairplanesandhelicoptersbetween1983and1997involving144femalepilotsand267malepilotsaged40-63.Femalepilotswerematchedwithmalepilotsina1:2ratiobyageclassesofmedicalandpilotcertificatesstateorareaofcrashandyearofcrash.Thenthecircumstancesofthecrashesandthepiloterrorinvolvedwerecategorizedandcodedwithoutknowledgeofpilotgender. Theresearchersfoundthatlossofcontrolonlandingortakeoffwasthemostcommoncircumstanceforbothsexesleadingto59percentoffemalepilots’crashesand36percentofmales’’.Experiencingmechanicalfailurerunningoutoffuelandlandingtheplanewiththelandinggearupwereamongthefactorsmorelikelywithmaleswhilestallingwasmorelikelywithfemales. Themajorityofthecrashes—95percentforfemalesand88percentformales—involvedatleastonetypeofpiloterror.Mishandlingaircraftkineticswasthemostcommonerrorforbothsexesbutwasmorecommonamongfemalesaccountingfor81percentofthecrashesthanmalesaccountingfor48percent.Maleshoweverappearedmorelikelytobeguiltyofpoordecision-makingrisk-takingandinattentivenessexamplesofwhichincludemisjudgingweatherandvisibilityorflyinganaircraftwithaknowndefect.Femalesthoughmorelikelytomishandleorlosecontroloftheaircraftweregenerallymorecarefulthantheirmalecounterparts. inattention/n.疏忽 aviation/n.航空 flawed/adj.有缺陷的 mishandle/v.瞎弄乱处理 MPHMasterofPublicHealth公共卫生硕士 gender/n.性性别 runout耗尽用完 stallv.飞机失速发动机熄火 kinetics/n.动力学 Inthecomparisonoffemaleandmalepilots______.
MaleandFemalepilotscauseaccidentsdifferently MalepilotsflyinggeneralaviationprivateaircraftintheUnitedStatesaremorelikelytocrashduetoinattentionorflaweddecisionmakingwhilefemalepilotsaremorelikelytocrashfrommishandlingtheaircraft.ThesearetheresultsofastudybyresearchersattheJohnsHopkinsUniversityBloombergSchoolofPublicHealth. Thestudyidentifiesthedifferencesbetweenmaleandfemalepilotsintermsofcircumstancesofthecrashandthetypeofpilotserrorinvolved.Crashesofgeneralaviationaircraftaccountfor85percentofallaviationdeathsintheUnitedStates.ThecrashrateformalepilotsasformotorvehicledriversexceedsthatofcrashesoffemalepilotsexplainsSusanP.BakerMPHprofessorofhealthpolicyandmanagementattheBloombergSchoolofPublicHealth.Becausepilotyouthandinexperienceareestablishedcontributorstoaviationcrasheswefocusedononlymaturepilotstodeterminethegenderdifferencesinthereasonsforthecrash. Theresearchersextracteddataforthisstudyfromalargeresearchprojectonpilotagingandflightsafety.Thedataweregatheredfromgeneralaviationcrashesofairplanesandhelicoptersbetween1983and1997involving144femalepilotsand267malepilotsaged40-63.Femalepilotswerematchedwithmalepilotsina1:2ratiobyageclassesofmedicalandpilotcertificatesstateorareaofcrashandyearofcrash.Thenthecircumstancesofthecrashesandthepiloterrorinvolvedwerecategorizedandcodedwithoutknowledgeofpilotgender. Theresearchersfoundthatlossofcontrolonlandingortakeoffwasthemostcommoncircumstanceforbothsexesleadingto59percentoffemalepilots’crashesand36percentofmales’’.Experiencingmechanicalfailurerunningoutoffuelandlandingtheplanewiththelandinggearupwereamongthefactorsmorelikelywithmaleswhilestallingwasmorelikelywithfemales. Themajorityofthecrashes—95percentforfemalesand88percentformales—involvedatleastonetypeofpiloterror.Mishandlingaircraftkineticswasthemostcommonerrorforbothsexesbutwasmorecommonamongfemalesaccountingfor81percentofthecrashesthanmalesaccountingfor48percent.Maleshoweverappearedmorelikelytobeguiltyofpoordecision-makingrisk-takingandinattentivenessexamplesofwhichincludemisjudgingweatherandvisibilityorflyinganaircraftwithaknowndefect.Femalesthoughmorelikelytomishandleorlosecontroloftheaircraftweregenerallymorecarefulthantheirmalecounterparts. inattention/n.疏忽 aviation/n.航空 flawed/adj.有缺陷的 mishandle/v.瞎弄乱处理 MPHMasterofPublicHealth公共卫生硕士 gender/n.性性别 runout耗尽用完 stallv.飞机失速发动机熄火 kinetics/n.动力学 WhatistheresearchatJohnsHopkinsUniversityabout?
UnitedNations AmajorsegmentoftheUntiedNationsistheGeneralAssemblywhichconsistsofrepresentativesfromallgovernmentsthathaveratifiedtheUNCharter.Asof1995185stateshadmembershipinthegeneralAssembly.AdditionallytheVaticanSwitzerlandandthePalestineLiberationOrganizationhavenonvotingobserverstatusintheGeneralAssembly.TheGeneralAssemblyapprovestheUN’’sbudgetactswiththeSecurityCounciltoselecttheSecretary-generalandjudgesoftheInternationalCourtofJusticeandpassesresolutionsonissuesrangingfromself-determinationandcolonialismtowomen’’srightsandtheglobaldistributionofwealth. TheGeneralAssemblycanmeetandvoteonanysubjectunlesstheSecurityCouncilisdealingwithitoratleastpretendingto.Howeveritsdecisionsonlycarrymoralforce—unliketheCouncil’’s.They’’renotbindingininternationallaws.ButtheAssemblyvotesareanimportantopinionpollonhowandwhatthemajorityoftheworldthinksaboutissues.Importantquestionsneedatwo-thirdsvoteoftheAssemblytopass. Thequestionofwhatisanimportantquestionisn’’timportant.Itsdecidedbythedelegatesthemselves—byasimplemajority. AlthoughtheGeneralAssemblyhasnotrecognizedauthoritytoenforceitsconclusionsonanythingotherthaninternalUNmattersitmakesitsviewpointsonissuesthatarebroughtbeforeitisknowninoneofthethreeways.AGeneralAssemblydeclarationisabroadstatementofgeneralprinciplesuchastheUniversalDeclarationofHumanRightspassedin1948.Declarationsareoftenputforwardasanexpressionofanidealinpracticetheyareregularlyignored.AGeneralAssemblyresolutionisessentiallyadocumentthatrecommendsthatmemberstatestakeaparticularpolicyaction.StatesclaimsovereigntyandmaketheirowndecisionsastowhethertheywillfollowaGeneralAssemblyresolution.Insomecaseshoweverifmanystatesimplementaparticularresolutionotherstatesthatmaynotwishtoactontheresolutionmayfeelthemselvespressuredtodosoanyway.Attheveryleastaresolutionhastheeffectoflegitimizingthepoliciesofthosestatesthatwishtocomplywiththeresolution.FinallyaGeneralAssemblyconventionortreatyhastwomeanings.ThemorecomprehensiveconventionreferstomultilateraltreatiesvotedonbytheGeneralAssemblythatuponpassagebytheGeneralAssemblyarecarriedbacktothecapitalsofmemberstatesforratificationbywhatevermeanseachstateusesdomestically.InothercasesaGeneralAssemblyconventionrefersspecificallytoatreatysignedbetweentheUnitedNationsandthegovernmentofanation-stateaswhenin1956EgyptagreedtoallowUnitedNationspeacekeepingforcestoenterEgyptianterritory. ThePassageofimportantissuesisdecidedbyatwo-thirdsvoteoftheAssembly.
HeartAttack IntheUnitedStatesandespeciallyinbigcitiesandruralareastensofthousandsofpeoplewithheartsthatshouldbegood【51】tokeepthemalivedieeachyearforlackofadequatefirstaid.InNewYorkCityforexampleanewstudyhasshownthatonlyonepersonin100outsideofhospitals【52】aftertheheartsuddenlystopspumping.IncontrastinSeattlethesurvival【53】aftersuchheartattacksisoneinfive. Thedifferencecanbetraced【54】theeffectivenessofthechainofsurvivalDr.JosephP.Ornatosaid.Eachlinkinthe【55】mustbestrongenoughformanylivestobe【56】. Thechainbeginswithanimmediatetelephone【57】foremergencyhelpandthestartwithinfourminutesoftheprocessneededforrestartingthe【58】workingbyafamilymemberorbystander旁观者. Itcontinueswiththepromptarrival-------withineight【59】tenminutesofarescuerequippedwithaspecialinstrumentthatcanshocktheheartbacktoanormalrhythm.Anditendswiththeadministration给予实施ofadvanced先进emergencycarebynursestomaintaintheheart’’sabilitytosurviveuntilthedoctorsatthehospitalscantake【60】Whenoneormorelinksinthischainfailorfunctiontooslowlythe【61】ofavictimsurvivingheartattackfallsrapidly.Becauseofwidespreadweaknessesinthechainof【62】expertsinemergencyheartcareestimatethat20000to80000people【63】needlesslyofheartattackeachyearanumbercomparabletothe55000killedannuallyinautomobile【64】. OneexpertsaysSendinganemergencyvehicletoaheartattackvictim【65】thespecialequipmentislikehavingpolicemenwithgunsbutnobullets.Theymayputonagoodshowbuttheylacktheweaponneededtogetthejobdone.
PrematureSmoking:ASeriousProblem ThethirdreportonsmokingandhealthfromtheRoyalCollegeofPhysicianswhichwaspublishedthismonthcontainsimportantnewsectionsonthesmokinghabitsofchildrenandthepossibleeffectontheirfuturehealth. Theseincludeatwentyfoldintheincreaseintheriskoflungcancerinheavysmokersandanincreaseofaboutthreeandahalftimesintheriskofdyingfromcoronary冠状的heartdisease;chronic慢性的oronchitis支气管炎andemphysema肺气肿arealsomuchcommoner.Teachersplayanimportantpartindeterminingtheattitudeofchildrentosmokingwhetherornotthechildrenstarttosmokeandinprovidingknowledgeabouttheconsequencesofsmoking. WheneverIseechildrenofschoolageopenlysmokinginpublicIwonderwhethertheyreallyunderstandwhattheyaredoing.Probablymostdonot.Iatleastknowthatmyclinicalpracticeinlungdiseasewillnotbeshortofpatientsfortherestofmyworkinglife.About34percentofboysaged15smokeandtwothirdsofthisnumberofgirls.Overthepasttenyearstherehasbeenasmallbutwelcomereductioninthenumberofboyswhosmokeatthisagebutanincreaseinthenumberofgirls. Onelargestudyhasshownthatofthosechildrenwhosmokemorethanonecigaretteasmanyas85percentbecomehabitual习惯的smokers.Thisispartlybecausenicotineisoneofthemostdependent—producingdrugsknownonaparwithheroinandotherharddrugsinthisrespect.Oneinthreesmokersstartbeforetheageofninesomeevenasyoungasfive. Thecausesofprematuredeathwhichone-thirdofsmokerswillsufferandoftheprolongedillnesseswhichaffectsomanyofthemaredescribedinthereport;itsenoughtosaythattheyoungerachildstartstosmokethegreaterarehischancesofdyingearly. Ithasbeenshownthatchildrenwhosmokehavecertaincharacteristics.Comparedwithnonsmokerstheyaremorerebellious__的theirworkdeteriorates使变坏astheymoveupschooltheyaremorelikelytoleaveschoolearlyandaremoreoftendelinquent违法的andsexually性的precocious早熟.Manyofthesefeaturescanbesummarizedasanticipationofadulthood. Thereareanumberoffactorswhichdeterminetheonset开始ofsmokingandthesearelargelypsychologicalandsocial.Theyincludeavailabilityofcigarettescuriosityrebelliousnessappearingtoughanticipationofadulthoodsocialconfidenceexampleofparentsandteachersandsmokingbyfriendsandolderbrothersandsisters. Itshouldbemucheasiertopreventchildrenfromstartingtosmokethantopersuadesadultstogiveupthehabitonceestablishedbutinfactthishasprovedverydifficult.Theexamplesetbypeopleinauthorityespeciallyparentshealthcareworkersandteachersisofprimeimportance.Schoolrulesshouldforbidsmokingbychildrenonthepremises场所.ThisrulehasevenbeenintroducedatSummerhillSchoolwhereIspentmyschooldays. Thereishoweverariskofchildrensmokingjusttorebelagainsttherulesandeveninthoseschoolswhichhavetriedtoenforcenosmokingbycorporeal肉体的punishmentthereismuchsmokingasinotherschoolsNeverthelessbanningsmokingisprobablyonbalancebeneficial.Teacherstooshouldnotsmokeonschoolpremisesatleastnotinfrontofchildren. Accordingtothepassageacommoncharacteristicofyoungsmokersisthat______.
HeartAttack IntheUnitedStatesandespeciallyinbigcitiesandruralareastensofthousandsofpeoplewithheartsthatshouldbegood【51】tokeepthemalivedieeachyearforlackofadequatefirstaid.InNewYorkCityforexampleanewstudyhasshownthatonlyonepersonin100outsideofhospitals【52】aftertheheartsuddenlystopspumping.IncontrastinSeattlethesurvival【53】aftersuchheartattacksisoneinfive. Thedifferencecanbetraced【54】theeffectivenessofthechainofsurvivalDr.JosephP.Ornatosaid.Eachlinkinthe【55】mustbestrongenoughformanylivestobe【56】. Thechainbeginswithanimmediatetelephone【57】foremergencyhelpandthestartwithinfourminutesoftheprocessneededforrestartingthe【58】workingbyafamilymemberorbystander旁观者. Itcontinueswiththepromptarrival-------withineight【59】tenminutesofarescuerequippedwithaspecialinstrumentthatcanshocktheheartbacktoanormalrhythm.Anditendswiththeadministration给予实施ofadvanced先进emergencycarebynursestomaintaintheheart’’sabilitytosurviveuntilthedoctorsatthehospitalscantake【60】Whenoneormorelinksinthischainfailorfunctiontooslowlythe【61】ofavictimsurvivingheartattackfallsrapidly.Becauseofwidespreadweaknessesinthechainof【62】expertsinemergencyheartcareestimatethat20000to80000people【63】needlesslyofheartattackeachyearanumbercomparabletothe55000killedannuallyinautomobile【64】. OneexpertsaysSendinganemergencyvehicletoaheartattackvictim【65】thespecialequipmentislikehavingpolicemenwithgunsbutnobullets.Theymayputonagoodshowbuttheylacktheweaponneededtogetthejobdone.
UnitedNations AmajorsegmentoftheUntiedNationsistheGeneralAssemblywhichconsistsofrepresentativesfromallgovernmentsthathaveratifiedtheUNCharter.Asof1995185stateshadmembershipinthegeneralAssembly.AdditionallytheVaticanSwitzerlandandthePalestineLiberationOrganizationhavenonvotingobserverstatusintheGeneralAssembly.TheGeneralAssemblyapprovestheUN’’sbudgetactswiththeSecurityCounciltoselecttheSecretary-generalandjudgesoftheInternationalCourtofJusticeandpassesresolutionsonissuesrangingfromself-determinationandcolonialismtowomen’’srightsandtheglobaldistributionofwealth. TheGeneralAssemblycanmeetandvoteonanysubjectunlesstheSecurityCouncilisdealingwithitoratleastpretendingto.Howeveritsdecisionsonlycarrymoralforce—unliketheCouncil’’s.They’’renotbindingininternationallaws.ButtheAssemblyvotesareanimportantopinionpollonhowandwhatthemajorityoftheworldthinksaboutissues.Importantquestionsneedatwo-thirdsvoteoftheAssemblytopass. Thequestionofwhatisanimportantquestionisn’’timportant.Itsdecidedbythedelegatesthemselves—byasimplemajority. AlthoughtheGeneralAssemblyhasnotrecognizedauthoritytoenforceitsconclusionsonanythingotherthaninternalUNmattersitmakesitsviewpointsonissuesthatarebroughtbeforeitisknowninoneofthethreeways.AGeneralAssemblydeclarationisabroadstatementofgeneralprinciplesuchastheUniversalDeclarationofHumanRightspassedin1948.Declarationsareoftenputforwardasanexpressionofanidealinpracticetheyareregularlyignored.AGeneralAssemblyresolutionisessentiallyadocumentthatrecommendsthatmemberstatestakeaparticularpolicyaction.StatesclaimsovereigntyandmaketheirowndecisionsastowhethertheywillfollowaGeneralAssemblyresolution.Insomecaseshoweverifmanystatesimplementaparticularresolutionotherstatesthatmaynotwishtoactontheresolutionmayfeelthemselvespressuredtodosoanyway.Attheveryleastaresolutionhastheeffectoflegitimizingthepoliciesofthosestatesthatwishtocomplywiththeresolution.FinallyaGeneralAssemblyconventionortreatyhastwomeanings.ThemorecomprehensiveconventionreferstomultilateraltreatiesvotedonbytheGeneralAssemblythatuponpassagebytheGeneralAssemblyarecarriedbacktothecapitalsofmemberstatesforratificationbywhatevermeanseachstateusesdomestically.InothercasesaGeneralAssemblyconventionrefersspecificallytoatreatysignedbetweentheUnitedNationsandthegovernmentofanation-stateaswhenin1956EgyptagreedtoallowUnitedNationspeacekeepingforcestoenterEgyptianterritory. AnanwaschosenasUNSecretary-generalontheGeneralAssembly.
DonthesitatetoletmeknowifthereisanythingIcandoforyou.
WeweresogreatlyattractedbythebeautyoftheWestLakethatwedecidedtovisitHangzhouagainthenextyear.
Interferon Forseveralyearsscientistshavebeentestingasubstancecalledinterferon干扰素apotentialwonderdrugthatisprovingtobeeffectiveintreatingavarietyofailmentsincludingvirusinfectionsbacteriainfectionsandtumors.Todatethenewdrughasprovokednonegativereactionofsufficientsignificancetodiscourageitsuse.Butinspiteofitssuccesslastyearonlyonegramwasproducedintheentireworld. Thereasonforthescarcityliesinthestructureofinterferon.Aspeciesspecificproteintheinterferonproducedfromoneanimalspeciescannotbeusedintreatinganotheranimalspecies.Inotherwordstotreathumanbeingsonlyinterferonproducedbyhumanbeingsmaybeused.Thedrugisproducedbyinfectingwhitebloodcellswithavirus.Fortunatelyitissopotentthattheamountgiveneachpatientperinjectionisverysmall. Unlikeantibiotics抗菌素interferondoesnotattackgermsdirectly.Insteaditmakesunaffectedcellsresistanttoinfectionandpreventsthemultiplicationofviruseswithincells. Asyoumightconcludeoneofthemostdramaticusesofinterferonhasbeeninthetreatmentofcancer.Dr.HansStranderresearchphysicianatSweden’’sfamousKarolinskaInstitutehastreatedmorethanonehundredcancerpatientswiththenewdrug.Amongagroupofselectedpatientswhohadundergonesurgicalproceduresforadvancedcancerhalfweregivenconventionaltreatmentsandtheotherhalfweregiveninterferon.Thesurvivalrateoverathree-yearperiodwas70percentamongthosewhoweretreatedwithinterferonascomparedwithonly10to30percentamongthosewhohadreceivedtheconventionaltreatments. IntheUnitedStatesalarge-scaleprojectsupportedbytheAmericanCancerSocietyisnowunderway.Iftheexperimentissuccessfulinterferoncouldbecomeoneofthegreatestmedicaldiscoveriesofourtime. Interferonhasnotbeenwidelyusedbecauseitisstillverydangerous.
PrematureSmoking:ASeriousProblem ThethirdreportonsmokingandhealthfromtheRoyalCollegeofPhysicianswhichwaspublishedthismonthcontainsimportantnewsectionsonthesmokinghabitsofchildrenandthepossibleeffectontheirfuturehealth. Theseincludeatwentyfoldintheincreaseintheriskoflungcancerinheavysmokersandanincreaseofaboutthreeandahalftimesintheriskofdyingfromcoronary冠状的heartdisease;chronic慢性的oronchitis支气管炎andemphysema肺气肿arealsomuchcommoner.Teachersplayanimportantpartindeterminingtheattitudeofchildrentosmokingwhetherornotthechildrenstarttosmokeandinprovidingknowledgeabouttheconsequencesofsmoking. WheneverIseechildrenofschoolageopenlysmokinginpublicIwonderwhethertheyreallyunderstandwhattheyaredoing.Probablymostdonot.Iatleastknowthatmyclinicalpracticeinlungdiseasewillnotbeshortofpatientsfortherestofmyworkinglife.About34percentofboysaged15smokeandtwothirdsofthisnumberofgirls.Overthepasttenyearstherehasbeenasmallbutwelcomereductioninthenumberofboyswhosmokeatthisagebutanincreaseinthenumberofgirls. Onelargestudyhasshownthatofthosechildrenwhosmokemorethanonecigaretteasmanyas85percentbecomehabitual习惯的smokers.Thisispartlybecausenicotineisoneofthemostdependent—producingdrugsknownonaparwithheroinandotherharddrugsinthisrespect.Oneinthreesmokersstartbeforetheageofninesomeevenasyoungasfive. Thecausesofprematuredeathwhichone-thirdofsmokerswillsufferandoftheprolongedillnesseswhichaffectsomanyofthemaredescribedinthereport;itsenoughtosaythattheyoungerachildstartstosmokethegreaterarehischancesofdyingearly. Ithasbeenshownthatchildrenwhosmokehavecertaincharacteristics.Comparedwithnonsmokerstheyaremorerebellious__的theirworkdeteriorates使变坏astheymoveupschooltheyaremorelikelytoleaveschoolearlyandaremoreoftendelinquent违法的andsexually性的precocious早熟.Manyofthesefeaturescanbesummarizedasanticipationofadulthood. Thereareanumberoffactorswhichdeterminetheonset开始ofsmokingandthesearelargelypsychologicalandsocial.Theyincludeavailabilityofcigarettescuriosityrebelliousnessappearingtoughanticipationofadulthoodsocialconfidenceexampleofparentsandteachersandsmokingbyfriendsandolderbrothersandsisters. Itshouldbemucheasiertopreventchildrenfromstartingtosmokethantopersuadesadultstogiveupthehabitonceestablishedbutinfactthishasprovedverydifficult.Theexamplesetbypeopleinauthorityespeciallyparentshealthcareworkersandteachersisofprimeimportance.Schoolrulesshouldforbidsmokingbychildrenonthepremises场所.ThisrulehasevenbeenintroducedatSummerhillSchoolwhereIspentmyschooldays. Thereishoweverariskofchildrensmokingjusttorebelagainsttherulesandeveninthoseschoolswhichhavetriedtoenforcenosmokingbycorporeal肉体的punishmentthereismuchsmokingasinotherschoolsNeverthelessbanningsmokingisprobablyonbalancebeneficial.Teacherstooshouldnotsmokeonschoolpremisesatleastnotinfrontofchildren. Accordingtothepassageoneriskofbanningsmokingisthat______.
Suburb Ifsuburbismeantanurbanmarginthatgrowsmorerapidlythanitsalreadydevelopedinteriortheprocessofsuburbanizationbeganduringtheemergenceoftheindustrialcityinthesecondquarterofthenineteenthcentury.Beforethatperiodthecitywasasmallhighlycompactclusterinwhichpeoplemovedaboutonfootandgoodswereconveyedbyhorseandcart.Buttheearlyfactoriesbuiltinthe1830’’sand1840’’swerelocatedalongwaterwaysandnearrailheadsattheedgesofcitiesandhousingwasneededforthethousandsofpeopledrawnbytheprospectofemployment.Intimethefactoriesweresurroundedbyproliferatingmilltownsofapartmentsandrowhousesaroundtheoldermaincities.Asadefenceagainstthisencroachmentandtoenlargetheirtaxbasesthecitiesappropriatedtheirindustrialneighbors.In1854forexamplethecityofPhiladelphiaannexedmostofPhiladelphiaCounty.SimilarmunicipalmaneuverstookplaceinChicagoandinNewYork.IndeedmostgreatcitiesoftheUnitedStatesachievedsuchstatusonlybyincorporatingthecommunitiesalongtheirborders. Withtheaccelerationofindustrialgrowthcomeacuteurbancrowdingandaccompanyingsocialstress-conditionsbegantoapproachdisastrousproportionswhenin1888thefirstcommerciallysuccessfulelectrictractionlinewasdeveloped.Withinafewyearsthehorse-drawntrolleyswereretiredandelectricstreetcarnetworkscrisscrossedandconnectedeverymajorurbanareafosteringawaveofsuburbanizationthattransformedthecompactindustrialcityintoadispersedmetropolis.Thisfirstphaseofmass-scalesuburbanizationwasreinforcedbythesimultaneousemergenceoftheurbanmiddleclasswhosedesiresforhomeownershipinneighborhoodsfarfromtheaginginnercityweresatisfiedbythedevelopingofsingle-familyhousingtracts. Itcanbeinferredfromthetextthatafter1890mostpeopletraveledaroundcitiesby______.
HeartAttack IntheUnitedStatesandespeciallyinbigcitiesandruralareastensofthousandsofpeoplewithheartsthatshouldbegood【51】tokeepthemalivedieeachyearforlackofadequatefirstaid.InNewYorkCityforexampleanewstudyhasshownthatonlyonepersonin100outsideofhospitals【52】aftertheheartsuddenlystopspumping.IncontrastinSeattlethesurvival【53】aftersuchheartattacksisoneinfive. Thedifferencecanbetraced【54】theeffectivenessofthechainofsurvivalDr.JosephP.Ornatosaid.Eachlinkinthe【55】mustbestrongenoughformanylivestobe【56】. Thechainbeginswithanimmediatetelephone【57】foremergencyhelpandthestartwithinfourminutesoftheprocessneededforrestartingthe【58】workingbyafamilymemberorbystander旁观者. Itcontinueswiththepromptarrival-------withineight【59】tenminutesofarescuerequippedwithaspecialinstrumentthatcanshocktheheartbacktoanormalrhythm.Anditendswiththeadministration给予实施ofadvanced先进emergencycarebynursestomaintaintheheart’’sabilitytosurviveuntilthedoctorsatthehospitalscantake【60】Whenoneormorelinksinthischainfailorfunctiontooslowlythe【61】ofavictimsurvivingheartattackfallsrapidly.Becauseofwidespreadweaknessesinthechainof【62】expertsinemergencyheartcareestimatethat20000to80000people【63】needlesslyofheartattackeachyearanumbercomparabletothe55000killedannuallyinautomobile【64】. OneexpertsaysSendinganemergencyvehicletoaheartattackvictim【65】thespecialequipmentislikehavingpolicemenwithgunsbutnobullets.Theymayputonagoodshowbuttheylacktheweaponneededtogetthejobdone.
HeartAttack IntheUnitedStatesandespeciallyinbigcitiesandruralareastensofthousandsofpeoplewithheartsthatshouldbegood【51】tokeepthemalivedieeachyearforlackofadequatefirstaid.InNewYorkCityforexampleanewstudyhasshownthatonlyonepersonin100outsideofhospitals【52】aftertheheartsuddenlystopspumping.IncontrastinSeattlethesurvival【53】aftersuchheartattacksisoneinfive. Thedifferencecanbetraced【54】theeffectivenessofthechainofsurvivalDr.JosephP.Ornatosaid.Eachlinkinthe【55】mustbestrongenoughformanylivestobe【56】. Thechainbeginswithanimmediatetelephone【57】foremergencyhelpandthestartwithinfourminutesoftheprocessneededforrestartingthe【58】workingbyafamilymemberorbystander旁观者. Itcontinueswiththepromptarrival-------withineight【59】tenminutesofarescuerequippedwithaspecialinstrumentthatcanshocktheheartbacktoanormalrhythm.Anditendswiththeadministration给予实施ofadvanced先进emergencycarebynursestomaintaintheheart’’sabilitytosurviveuntilthedoctorsatthehospitalscantake【60】Whenoneormorelinksinthischainfailorfunctiontooslowlythe【61】ofavictimsurvivingheartattackfallsrapidly.Becauseofwidespreadweaknessesinthechainof【62】expertsinemergencyheartcareestimatethat20000to80000people【63】needlesslyofheartattackeachyearanumbercomparabletothe55000killedannuallyinautomobile【64】. OneexpertsaysSendinganemergencyvehicletoaheartattackvictim【65】thespecialequipmentislikehavingpolicemenwithgunsbutnobullets.Theymayputonagoodshowbuttheylacktheweaponneededtogetthejobdone.
Afterthewholeday’’smarchtheyaretoofatiguetowalkanymore.
HeartAttack IntheUnitedStatesandespeciallyinbigcitiesandruralareastensofthousandsofpeoplewithheartsthatshouldbegood【51】tokeepthemalivedieeachyearforlackofadequatefirstaid.InNewYorkCityforexampleanewstudyhasshownthatonlyonepersonin100outsideofhospitals【52】aftertheheartsuddenlystopspumping.IncontrastinSeattlethesurvival【53】aftersuchheartattacksisoneinfive. Thedifferencecanbetraced【54】theeffectivenessofthechainofsurvivalDr.JosephP.Ornatosaid.Eachlinkinthe【55】mustbestrongenoughformanylivestobe【56】. Thechainbeginswithanimmediatetelephone【57】foremergencyhelpandthestartwithinfourminutesoftheprocessneededforrestartingthe【58】workingbyafamilymemberorbystander旁观者. Itcontinueswiththepromptarrival-------withineight【59】tenminutesofarescuerequippedwithaspecialinstrumentthatcanshocktheheartbacktoanormalrhythm.Anditendswiththeadministration给予实施ofadvanced先进emergencycarebynursestomaintaintheheart’’sabilitytosurviveuntilthedoctorsatthehospitalscantake【60】Whenoneormorelinksinthischainfailorfunctiontooslowlythe【61】ofavictimsurvivingheartattackfallsrapidly.Becauseofwidespreadweaknessesinthechainof【62】expertsinemergencyheartcareestimatethat20000to80000people【63】needlesslyofheartattackeachyearanumbercomparabletothe55000killedannuallyinautomobile【64】. OneexpertsaysSendinganemergencyvehicletoaheartattackvictim【65】thespecialequipmentislikehavingpolicemenwithgunsbutnobullets.Theymayputonagoodshowbuttheylacktheweaponneededtogetthejobdone.
Suburb Ifsuburbismeantanurbanmarginthatgrowsmorerapidlythanitsalreadydevelopedinteriortheprocessofsuburbanizationbeganduringtheemergenceoftheindustrialcityinthesecondquarterofthenineteenthcentury.Beforethatperiodthecitywasasmallhighlycompactclusterinwhichpeoplemovedaboutonfootandgoodswereconveyedbyhorseandcart.Buttheearlyfactoriesbuiltinthe1830’’sand1840’’swerelocatedalongwaterwaysandnearrailheadsattheedgesofcitiesandhousingwasneededforthethousandsofpeopledrawnbytheprospectofemployment.Intimethefactoriesweresurroundedbyproliferatingmilltownsofapartmentsandrowhousesaroundtheoldermaincities.Asadefenceagainstthisencroachmentandtoenlargetheirtaxbasesthecitiesappropriatedtheirindustrialneighbors.In1854forexamplethecityofPhiladelphiaannexedmostofPhiladelphiaCounty.SimilarmunicipalmaneuverstookplaceinChicagoandinNewYork.IndeedmostgreatcitiesoftheUnitedStatesachievedsuchstatusonlybyincorporatingthecommunitiesalongtheirborders. Withtheaccelerationofindustrialgrowthcomeacuteurbancrowdingandaccompanyingsocialstress-conditionsbegantoapproachdisastrousproportionswhenin1888thefirstcommerciallysuccessfulelectrictractionlinewasdeveloped.Withinafewyearsthehorse-drawntrolleyswereretiredandelectricstreetcarnetworkscrisscrossedandconnectedeverymajorurbanareafosteringawaveofsuburbanizationthattransformedthecompactindustrialcityintoadispersedmetropolis.Thisfirstphaseofmass-scalesuburbanizationwasreinforcedbythesimultaneousemergenceoftheurbanmiddleclasswhosedesiresforhomeownershipinneighborhoodsfarfromtheaginginnercityweresatisfiedbythedevelopingofsingle-familyhousingtracts. Theauthormentionsthatareasborderingthecitieshavegrownduringtheperiodof______.
ThepriceissomewhathigherthanIexpected.
Itshardtoalteroneshabits.
Theplannedgeneralstrikerepresentsavitaleconomicchallengetothegovernment.
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?
Whiletheywereawayonvocationtheyallowedtheirmailtobeaccumulatedatthepostoffice.
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