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Lesson17SavetheTigers1.Wherecanyouusuallyseeatiger?2.Doyouthinktigersneedourhelp?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Wordsandexpressionsbalancereasondisappearkillcutdecreasen.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,aswelltheBengaltigertheSiberiantiger[sai'biəriən][beŋ'ɡɔ:l]Therearecurrentlysixtypesoftigers:['kʌrəntlɪ]西伯利亚虎孟加拉虎theSumatrantigertheMalayantiger[su'mɑ:trən][mə'leiən]苏门答腊虎马来亚虎theIndochinesetigertheSouthChinatiger印度支那虎华南虎Howmanytigerswasthereatthebeginningof20thcentury？ReadandAnswer:ReadandAnswer:Wheredotigerslivein?foodchainReadandAnswer:Whydosomepeoplehuntandkilltigers?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。我们班有50人；这本书有60页；许多学生在山上植树。Thenumberofstudentsinourclassis50.Thenumberofpagesinthisbookis60.Anumberofstudentsareplantingtreesonthehill.合作探究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。……对……来说是重要的。对于……来说做……是重要的。Timeisimportanttome.Itisimportantforyoutogetthereearly.beimportanttosb./sth.beimportantforsb./sth.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.aswell位于句首或句末，在局末尾时，不用逗号分开。用于肯定句。too位于句末，前面用逗号分开。用于肯定句。either位于句尾，其前有无逗号均可。用于否定句。also位于be动词和助动词之后，行为动词之前，用于肯定句。表示“也”的短语和单词Fillintheblanks.1._____________studentsisabouttwenty.(……的数量)2.It’s____________yourhealth.(对……是重要的)3.Theriverispollutedand___________goingdry.(处于……危险中)Thenumberofimportanttoindangerof当堂检测4.____timewentby,shebecamemoreandmorebeautiful.(随着)5._________________theparty,hegavemeagift.(在……之初)6.Thetemperaturehas__________belowzero.(下降到)7.Itisatthebottomofthe_________.(食物链)8.Youknow,computersbringtroubles_______.(也)AsAtthebeginningofdroppedtofoodchainaswell1.Inourschoollibrarythere___anumberofbooksonscience,andintheseyearsthenumberofthem___growinglargerandlarger.A.are,isB.is,areC.have,areD.has,is2.--IsyourfriendMichaelstillinAustralia?--Idon’tknow,Ihave___informationabouthimbecausewehaven’tseeneachotherfor___years.A.alittle,afewB.little,afewC.afew,alittleD.few,alittle3.___yournameonthepaperandyoucangetamagazine.A.CutdownB.LookdownC.TurndownD.Putdown4.Sheaswellasherclassmates____Englishverymuch.A.likeB.likesC.havelikeD.liked.5Theteacher,YangXingmingshowedgreat___(勇气)tojumpintotherivertosavetheboy.6.Rubthisoilintoyourskinandyourheadachewillsoon____(appear)!Haveatry!Homework1.ReviewLesson17.2.Writeashortpassageabouthowtoprotectanimals.