资源描述：
《高中英语 unit 3《science versus nature》welcome to the unit教案4 译林版必修5》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、Unit3ScienceversusnaturePeriodoneWelcometothisUnitTeachingAims:Enablethestudentstoknowsomethingaboutcloning,andgivetheirownopinionsaboutcloning.Helpthestudentslearnhowtodescribetheadvantagesanddisadvantagesofhumancloningwiththetargetlanguage.Teachingimportantanddifficultpoints:T
2、alkaboutcloningandhumancloning.Howtodescribetheadvantagesanddisadvantagesofhumancloning.TeachingProceduresStep1.Lead-inInthelastunit,welearnedsomethingabouttheenvironment.Nowourearthisfacedwithalotofproblems.Q1:whataretheproblems?(复习一下第二单元所学的知识，为下文做铺垫)Waterpollution,airpollution
3、,rubbish,deforestation,desertification,andsandstormQ2:Let’shaveacompetition.Pleasethinkthatwhatweshoulddotoprotectourenvironment.Themorethebetter.Onemeasureisworth10points.(通过竞赛的形式激发学生的兴趣。为了使在这一轮竞赛中失利的同学继续保持信心，这轮比赛的分数要累计到下一轮竞赛中。)Fromthesemeasures,weknowthatprotectingtheenvironme
4、ntiseveryone’searth,includingplants,animals,humanbeings.But,somerareanimalsaredyingout,suchasrhinoceros,northeasttiger,white-flagdolphinandgiantpanda.Q3:whatshouldwedotoprotectthem?buildnaturereservemakelawstoprohibitthemfrombeinghuntedcloningInrecentyears,scienceisdevelopingsof
5、astthatitisbeyondourimagination.Cloningisoneofthemoreadvancedtechnologies.（通过设计一系列的问题来导入到本单元的主题“克隆技术”）Step2Describingpictures.Today,wearegoingtolearnsomeinformationaboutcloning,nowlet’senjoysomepictures.Picture1Q1:Areyoufamiliarwiththesepictures?Q2:WhatdoyouknowaboutDolly?Thewor
6、ld’sfirstclonedmammal.Q3:Whocreatedit?Scottishscientists.Q4:Whenwasitcreated?On22ndFebruary1996Q5:Isshestillalive?No,shediedin2003becauseoflungdisease.（设计这些问题是为了引起学生的兴趣，把这些知识都设计成问题形式是为了下文的一个竞赛做铺垫，加深学生对这些知识的印象）Dollywasworldfamousbecauseshewasexactlythesameashermother,inappearance
7、andingenes.Nowlet’slookattheprocessofherbirth.First,weneedthreefemalesheepandtakeakindofcellfromthefirstsheep,thentakeoutthecenterofthecell.Andthentakeanotherkindofcellfromthesecondsheep,andalsotakeoutthecenterofthecell,andthenputthecenterofthecelltakenfromthefirstsheepintothisk
8、indofcell.Andputthisnewcellintothethirdsheep,an
