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1、Lesson17 SavetheTigerscenturyfursymbolcouragebravechainn.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WordsandexpressionsTimeforReflection在……之初下降到；跌至食物链保持平衡处于危险状
2、态把……砍到，减少（除某事或某人外）还，也atthebeginningof…,dropto,foodchain,inbalance,indanger,cutdown,aswellTousethefollowingwordsandexpressionscorrectly:century,courage,brave,reason,kill,cut,atthebeginningof…,dropto,foodchain,inbalance,indanger,cutdown,aswellobjectivesWherecanyo
3、u usuallyseeatiger?ThinkAboutIt2.Doyouthinktigers needourhelp?Seethevideoofareport.Therearecurrentlysixtypesoftigers:theBengaltiger,theSiberiantiger,theSumatrantiger,theMalayantiger,theIndochinesetigerandtheSouthChinatiger.theBengaltigertheSiberiantigertheSumat
4、rantigertheMalayantigertheIndochinesetigertheSouthChinatigerHowmanytigerswasthereatthebeginningof20thcentury？ReadandAnswer:ReadandAnswer:Wheredotigerslivein?foodchainReadandAnswer:Whydosomepeoplehuntandkilltigers?LanguagePoints1.Atthebeginningofthe20thcentury,t
5、henumberoftigersinthewildwasaround100000.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.An
6、umberofstudentsareplantingtreesonthehill.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.Thous
7、andsofstudentsareonthesquare.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,tigershavebeenindanger
8、ofdisappearing.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.Asforestsdi
