高中英语 unit 3 a healthy life导学案（必修6）

《高中英语 unit 3 a healthy life导学案（必修6）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、必修6Unit3AHealthyLife导学案阅读欣赏WhatWeStillDon'tKnowAboutAIDS？Inthe20yearssincethefirstcasesofAIDSaredetected，scientistssaytheyhavelearnedmoreaboutthisviraldiseasethananyother.YetPeterPiot，whodirectstheUnitedNationsAIDSprogram，andStefanoVellaofRome，presidentofth

2、eInternationalAIDSSociety，andotherexpertssayreviewingunansweredquestionscouldproveusefulasameasureofprogressforAIDSandotherdiseases.Amongtheimportantbroaderscientificquestionsthatremain：1．WhatroutedoesHIVtakeafteritentersthebodytodestroytheimmunesystem?When

3、HIVistransmittedsexually，thevirusmustcrossatissuebarriertoenterthebody.Howthathappensisstillunclear.Thevirusmightinvadedirectlyorbecarriedbyaseriesofdifferentkindsofcells.2．HowdoesHIVdestroytheimmunesystem?AlthoughHIVkillstheimmunecellssenttokillthevirus，th

4、ereiswidespreadvariationintherateatwhichHIVinfectedpeoplebecomeillwithAIDS.Soscientistsask：Cantheelementsoftheimmunesystemresponsibleforthatvariabilitybeidentified？Ifso，cantheybeusedtostopprogressiontoAIDSinfectedindividualsandpossiblypreventinfectioninthef

5、irstplace?3．Whatisthemosteffectiveanti-HIVtreatment?Intheory，earlytreatmentshouldofferthebestchanceofpreservingimmunefunction.Butthenewdrugsdonotcompletelyeliminate(消除)HIVfromthebodysothemedicines，whichcanhavedangeroussideeffects，willhavetobetakenforalifeti

6、meandperhapschangedtocombatresistance.Thenewpolicyisexpectedtorecommendthattreatmentbedeferred(推迟)untiltherearesignstheimmunesystemisweakening.4．Isavaccinepossible?Thereislittlequestionthataneffectivevaccineiscrucialtocontrollingthedisease.Yetonlyonehasreac

7、hedthestageoffulltesting，andthereiswidecontroversyoverthedegreeofprotectionitwillprovide.HIVstrainsthataretransmittedinvariousareasoftheworlddiffergenetically.ItisnotknownwhetheravaccinederivedfromonetypeofHIVwillprovideprotectionagainstothertypes.5．Intheab

8、senceofavaccine，howcanHIVbestopped?Withoutmoreincisive，focusedbehavioralresearch，preventionmessagesalonewillnotstoptheglobaldisease.科学家说，在第一批艾滋病例被发现以后的20年里，他们对这种病毒性疾病的了解，已超过其他任何一种病毒性疾病。　　但是，联合国艾滋病规划署的负