Unit5Lesson29DNATheStoryofYou学案初中英语冀教版九年级全一册

Unit5Lesson29DNA—TheStoryofYou【学习目标】1.通过基础练习,能记住并正确使用本课时的重点单词和重点短语。2.通过有效地呈现本课时内容,能够理解课文内容并回答课后的问题。3.通过小组合作活动,能够用英语向他人介绍自己所知道的有关DNA的知识。【预习导学】一、单词速记1.脱氧核糖核酸

2.蓝图

3.一般的;普遍的

4.复杂的

5.双胞胎之一

6.重复;复述;背诵

7.模式;形式

8.确认;鉴别

9.有关的;相关的

10.孙子;外孙

11.孙女;外孙女

12.指示;说明

二、短语速记1.ingeneral 2.exceptfor 3.beesick 4.beableto 5.例如 6.和……相同的…… 7.与……相关 8.数十亿计的;大量 三、想一想1.文中介绍了什么是DNA?______________________________________________________________2.科学家们可以通过你的DNA鉴别什么?______________________________________________________________【答案】一、1.DNA2.blueprint3.general4plex5.twin6.repeat7.pattern8.identify9.related10.grandson11.granddaughter12.instruction二、1.一般而言;通常2.除……之外3.生病4.会;能5.forexample6.thesame...as7.berelatedto8.billionsof三、1.DNAistheblueprintoflife.2.FromyourDNA,scientistscanidentifynotonlyyou,butalsopeoplewhoarerelatedtoyou.【合作探究】任务驱动一单词、短语大闯关1.齐读本课重点单词和短语。2.用方框内所给单词的适当形式填空。instructiontwinrepeatgrandsongeneral(1)LucyandLilyare.Theylookthesame.

(2)Readthebeforeusingthenewphone.

(3)Thesedifficultiesareamongpeopleofhisage.

(4)Ican'tfollowyou,Tony.Pleasethesentence.

(5)ThelittleboyisMr.King's.

3.ShowLet'sDoIt!2.Fillintheblankswiththephrasesinthebox.ingeneralexceptfornotonly...butalsorelatedtoevenifthesame...as(1)Yourhomeworkisquitegoodafewspellingmistakes.

(2)theyoungtheoldlikepopmusic.

(3)Kate'shairiscolourhersister's.

(4),womenlivelongerthanmen.

(5)manydifficultiesremain,wecanoverethem.

(6)Iswealthhappiness?

任务驱动二听力训练1.Listentothelessonandfillintheblanks.(1)forsometwins,everylivingthinghasitsownuniqueDNA.

(2)SomeproblemscanbecausedbyproblemsinyourDNA.

(3)YourfingerhastheDNAasyourhair.

(4)FromyourDNA,canidentifynotonlyyou,butalsopeoplewhoarerelatedtoyou.

(5)DNAisoneoftheamazingthingsontheearth!

2.ShowLet'sDoIt!1.Readthelessonandanswerthequestions.3.反复听录音并跟读。熟记课文,掌握文章各段的大意,并借此来复述课文,训练口语表达。任务驱动三小组活动1.ShowLet'sDoIt!3.pletethelessonwiththesentencesinthebox.2.Discussion.IsitagoodideatochangetheDNAofthefoodweeat?Dividethestudentsintotwogroups.OnegroupsupportitisagoodideatochangetheDNAofthefoodweeat.TheothergroupsaysomethingaboutthedisadvantagesofchangingtheDNAofthefood.【答案】任务驱动一2.(1)twins(2)instructions(3)general(4)repeat(5)grandson3.(1)exceptfor(2)Notonlybutalso(3)thesame(4)InGeneral(5)Evenif(6)relatedto任务驱动二1.(1)Except(2)health(3)same(4)scientists(5)most【知识超市】[命题点]Exceptforsometwins,everylivingthinghasitsownuniqueDNA。除了同卵双胞胎之外,每个生物都有自己独特的DNA.

短语exceptfor意为“除……之外”。如:Thecityisgoodexceptfortheweather.除天气外,这座城市还不错。辨析:exceptfor、except、besides和butexcept意为“除了”,强调不在其中,指从同类事物的总体中除去一部分exceptfor意为“除了”,表示对主要部分的肯定以及对局部的否定besides意为“除了……之外(还有)”,后面接名词、代词、或动名词,但不能接从句but意为“除……外”,强调不在其中,与except可互换,多与no、nobody、who、where、all等连用对点自测根据汉语意思完成句子。1.他是个好人,除了有点脾气坏。Heisagoodman