冀教版八下Unit 3 Animals Are Our Friends lesson 17 Save the Tigers课件

Unit3SavetheTigersLesson17 Thinkaboutit!•Wherecanyouusuallyseeatiger?•Doyouthinktigersneedourhelp?Whyorwhynot? Therearecurrentlysixtypesoftigers:theBengaltiger,theSiberiantiger,theSumatrantiger,theMalayantiger,theIndochinesetigertheSouthChinatiger. theBengaltiger theSiberiantiger theSumatrantiger theMalayantiger theIndochinesetiger theSouthChinatiger centuryfursymbolcouragebravechainn.世纪n.（兽类的）毛n.标志，象征n.勇气，胆量adj.勇敢的，无畏的n.链子；链条Wordsandexpressions balancereasondisappearkillcutdecreasen.平衡，平稳n.原因，动机，理由v.消失，失踪v.杀死v.砍，切，剪，割v.使……变小；减少Wordsandexpressions Tousethefollowingwordsandexpressionscorrectly:century,courage,brave,reason,kill,cut,atthebeginningof…,dropto,foodchain,inbalance,indanger,cutdown,aswellobjectives Readthelessonandanswerthequestions.1.Howmanytigerswerethereatthebeginningofthe20thcentury?Around100000.2.Howmanytigersarethereinthewildtoday?Thenumberhasdroppedtoafewthousand.3.Wheredotigerslive?TheyliveintheforestsofAsia. 4.Whatdotigerslooklike?Theyusuallyhaveorangefuranddarkstripes.5.Whatdotigerssymbolize?Theyaresymbolsofstrengthandcourage.6.Howaretigersdescribedinmanystories?Theyarebrave. 7.Whatdoes“atthetopofthefoodchain”mean?Tigersarethekingofallthewildanimals.8.Whatisthereasontigersareimportanttotheenvironment?Becausetigershelpkeepthenumberofotherwildanimalsinbalance.9.Whydopeoplehuntandkilltigers?Theyareformoney. 10.Asidefromtheirbeinghuntedandkilled,whatisanotherreasontigersaredisappearing?Peoplehavecutdownalotoftreesaswell.Asforestsdisappear,tigerslosethehomes. Languagepoints 1.Atthebeginningofthe20thcentury,thenumberoftigersinthewildwasaround100000.在二十世纪初期，野生老虎的数量大约是十万只。thenumberof意为“……的数量”，跟复数名词连用作主语时，中心词是number，谓语动词要用单数。 anumberof表示“许多”，相当于many，修饰可数名词复数。作主语时，谓语动词用复数。number前可用large，small等修饰，表示程度。例如：Thenumberofstudentsinourclassis50.Thenumberofpagesinthisbookis60.Anumberofstudentsareplantingtreesonthehill. 2.Buttodaythatnumberhasdroppedtoafewthousand.但是现在，数量已经下降到几千只。afewthousand表示“几千”。当hundred,thousand前面是基数词one,two,three…afew,many时，其后不加s。当hundred和thousand后面加s时，需要跟of修饰可数名词复数。例如：Therearethreethousandstudentsinourschool.Thousandsofstudentsareonthesquare. 3.Forthisreason,tigersareimportanttotheenvironment.因为这个原因，老虎对环境很重要。beimportanttosb./sth.……对……来说是重要的。beimportantforsb./sth.对于……来说做……是重要的。例如:Timeisimportanttome.Itisimportantforyoutogetthereearly. 4.Inrecentyears,tigershavebeenindangerofdisappearing.在近几年，老虎处于濒临灭绝的危险中。indanger(of)意为“处于（……）危险之中”。例如You’reindangerofcatchingacold.Thesickmanisindangerofdeath.Thepassengersareindanger!Let’sgoandhelp! 5.Asforestsdisappear,tigerslosetheirhomes.随着森林的消失，老虎失去了它们的家园。as在句中作连词，引导状语从句，意为“随着，当……的时候”。Asthesunrose,thefogdisappeared.Asshelefttheroom,sherememberedthatbook. Let’sDoIt!Readthelessonandmatcheachparagraphwithitsmainidea.1A.Tigersareindangerofgoingextinct.“SavetheTigers”isavolunteergroupthathopestostopthetigersfromdisappearing.C.Tigersareimportanttotheenvironment.BCA TimeforReflection在……之初下降到；跌至食物链保持平衡处于危险状态把……砍到，减少（除某事或某人外）还，也atthebeginningof…,dropto,foodchain,inbalance,indanger,cutdown,aswell Exercise Fillintheblanks.1._____________studentsisabouttwenty.(……的数量)2.It’s____________yourhealth.(对……是重要的)3.Theriverispollutedand___________goingdry.(处于……危险中)4.____timewentby,shebecamemoreandmorebeautiful.(随着)ThenumberofimportanttoindangerofAs 5._________________theparty,hegavemeagift.(在……之初)6.Thetemperaturehas__________belowzero.(下降到)7.Itisatthebottomofthe_________. (食物链)8.Youknow,computersbringtroubles_______.(也)Atthebeginningofdroppedtofood chainaswell Workingroupsanddiscussomewayswecanprotectanimals.Writedownyourideas.Homework