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1、Unit5LookintoScienceLesson29DNA-TheStoryofYou◆教材分析1.AnalysisoftheStudentsThestudentsofGrade9havemasteredcertainvocabularies，expressionsandstructures.Theyalsohavetheabilitiesofself-teachingandworkingingroups.MostofthemarewillingtoexpresstheiropinionsinEnglish.2.AnalysisofTeach
2、ingContentLesson28isthefifthlessoninUnit5,Book5.ThisunitfocusonthesubjectLookintoscience,alsoteachthestudentssomethingaboutscience.Studentscaresaboutthesubjectbecauseitisclosetoeveryone.Lesson28mainlytalksaboutDNA,ittellusthecharacterandfunctionofDNA,alsounderstandourbody.Wea
3、reuniqueintheworld.◆教学目标【知识目标】1.Tomasterthewords:blueprint,general,complex,twins,pattern,identify,berelatedto,exceptfor.2.Tomasterthephrases:notonly…butalso,exceptfor,berelatedto,billionsof.【能力目标】Improvethestudents’abilityofspeaking,listening,readingandwriting.Understandthear
4、ticlesaboutDNA.【情感目标】Knowmoreaboutthenature,knowmoreaboutourbody.Youareuniqueintheworld.【教学重点】Tomasterthecompoundsentences.【教学难点】TomastertheuseofDNA.◆课前准备◆Taperecorder,Multimedia◆教学过程Step1.Warm-upFreetalk:(showthepictureofDNA,tellstudentsDNAisshortfordeoxyribonucleicacid.)Thi
5、nkaboutit!1.WhatdoyouknowaboutDNA?2.WhatcanscientistsdowithDNA?Step2.Presentation1.Freetalk:(1)Whereisitinourbody?(ShowsomepicturesofDNA.)(2)What'sthefunctionofDNA?(Showsomepicturesoftwins.)2.Explainthenewwords.3.Readthelessonandanswerthequestions：(1)Whatisablueprint?(2)Which
6、ismorecomplex,buildingalivingthingorbuildingahouse?(3)DosometwinshavethesameDNA?(4)IsitpossibletochangeyourDNA?(5)WhoseDNAisrelatedtoyours?4.Checktheanswersandunderlinethekeywords.5.Listenandfollowtothetape.6.Explainthelanguagepoints:between与amongbetween用于两者之间，among一般指三者或三者以上
7、。JacksitsbetweenTimandBob.Jack坐在Tim和Bob之间。Shewasamongthecrowd.她处在人群中。use…todosth.用……做某事Sheisusingaknifetocutvegetables.她正用小刀切蔬菜。use的形容词是useful.Isthefridgeveryuseful?这台冰箱很有用吗？too与eithertoo与either都表示“也”，其区别是too用于肯定句，表示“也”；either用于否定句，表示“也不”。他们通常都位于句末，其前用逗号隔开。Hehasababybrother,t
8、oo.他也有个小弟弟。Hedoesn’thaveaneraser,either.他也没有橡皮。own的用法adj.自己的（用在所有格后面
