八年级英语下册 Unit 3 lesson 17 Save the Tigers名师课件 (新版)冀教版.ppt
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1、 Lesson 17:Save the Tigers1)the number of2)balance的用法的用法3)danger的用法的用法I.Learning aims:Master the new words:century,fur,symbol,courage,brave,chain,balance,reason,disappear,kill,cut,decreaseII.Learning important and difficult points:New Wordscentury fursymbol couragebrave chainbalance reason disappear
2、 killcut decreaseThink About ItlWhere can you usually see a tiger?lDo you think tigers need our help?Why or why not?Language Points1.At the beginning of the 20th century,the number of tigers in the wild was around 100 000.在二十世纪初期,野生老在二十世纪初期,野生老虎的数量大约是十万。虎的数量大约是十万。the number of是固定短语,意为“的数量”,后接可数名词复数,
3、但中心词是number,所以谓语动词要用单数。如:The number of students in our school has grown from 1,000 to more than 1,500.a number of为量词短语,意为“许多;大量”,相当于a lot of或lots of,中心词是该短语所修饰的可数名词复数,所以作主语时,谓语动词用复数形式。如:A number of students like playing computer games.2.It helps keep the number of other wild animals in balance.它可以帮助
4、保持其他野生它可以帮助保持其他野生动物的数量平衡。动物的数量平衡。balance 在句中用作名词,意为“平衡;均衡”,常用短语be out of balance,意为“不平衡”;keep in balance意为“保持平衡”;balance还作动词,表示“(使)平衡;(使)均衡”。如:You must learn to keep your balance in skating.在滑冰时你必须要学会保持平衡。3.In recent years,tigers have been in danger of disappearing.近年来,老虎近年来,老虎已经面临消失的危险。已经面临消失的危险。da
5、nger意为意为“危险危险”,通常是不可数,通常是不可数名词,表示做某事的危险或发生某情名词,表示做某事的危险或发生某情况的危险等,常用短语况的危险等,常用短语 be in danger(of),意为,意为“在危险中在危险中”。如:。如:Is there any danger of fire?有发生有发生火灾的的危险吗?火灾的的危险吗?Exercises1._(长颈鹿)are the tallest animals on land.2.What beautiful _(婚礼)clothes they are!3.Uncle Yan visited many _(亚洲的)countries la
6、st year.4.He is interested in _(历史).history I.根据句意及所给汉语提示,完成下列句子。根据句意及所给汉语提示,完成下列句子。GiraffesweddingAsian1.One of the worlds biggest zoos _(be)in Egypt.2.My pet dog _(die)two weeks ago.3._(bar)keep the animals inside.4.They got _(marry)on August,8th 2008.5.The Siberian tiger is the _(big)cat(猫科动物)in
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