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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?1.At the beginning of the 20th century,the number of tigers in the wild was around 100 000.在二十世紀(jì)初期，野生老在二十世紀(jì)初期，野生老虎的數(shù)量大約是十萬?；⒌臄?shù)量大約是十萬。the number of是固定短語，意為“的數(shù)量”，后接可數(shù)名詞復(fù)數(shù)，但中心詞是number，所以謂

3、語動(dòng)詞要用單數(shù)。如：The number of students in our school has grown from 1,000 to more than 1,500.a number of為量詞短語，意為“許多；大量”，相當(dāng)于a lot of或lots of，中心詞是該短語所修飾的可數(shù)名詞復(fù)數(shù)，所以作主語時(shí)，謂語動(dòng)詞用復(fù)數(shù)形式。如：A number of students like playing computer games.2.It helps keep the number of other wild animals in balance.它可以幫助保持其他野生它可以幫助保持其他

4、野生動(dòng)物的數(shù)量平衡。動(dòng)物的數(shù)量平衡。balance 在句中用作名詞，意為“平衡；均衡”，常用短語be out of balance，意為“不平衡”；keep in balance意為“保持平衡”；balance還作動(dòng)詞，表示“（使）平衡；（使）均衡”。如：You must learn to keep your balance in skating.在滑冰時(shí)你必須要學(xué)會(huì)保持平衡。3.In recent years,tigers have been in danger of disappearing.近年來，老虎近年來，老虎已經(jīng)面臨消失的危險(xiǎn)。已經(jīng)面臨消失的危險(xiǎn)。danger意為意為“危險(xiǎn)危險(xiǎn)”，

5、通常是不可，通常是不可數(shù)名詞，表示做某事的危險(xiǎn)或發(fā)生某數(shù)名詞，表示做某事的危險(xiǎn)或發(fā)生某情況的危險(xiǎn)等，常用短語情況的危險(xiǎn)等，常用短語 be in danger(of)，意為，意為“在危險(xiǎn)中在危險(xiǎn)中”。如：如：Is there any danger of fire?有發(fā)生有發(fā)生火災(zāi)的的危險(xiǎn)嗎？火災(zāi)的的危險(xiǎn)嗎？1._(長(zhǎng)頸鹿)are the tallest animals on land.2.What beautiful _(婚禮)clothes they are!3.Uncle Yan visited many _(亞洲的)countries last year.4.He is intereste

6、d in _(歷史).history I.根據(jù)句意及所給漢語提示，完成下列句子。根據(jù)句意及所給漢語提示，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(貓科動(dòng)物)in the world.biggest II.用所給單

7、詞的適當(dāng)形式填空。用所給單詞的適當(dāng)形式填空。isdiedBarsmarried1.Nobody else wants to go to the village.(改為同義句)_ _ _ want to go to the village.2.Liu Yang kept two dogs.(改為否定句)Liu Yang _ _ two dogs.3.Those zoos have ten pandas.(改為同義句)_ _ ten pandas in those zoos.There are III.句型轉(zhuǎn)換，每空一詞。句型轉(zhuǎn)換，每空一詞。No other peopledidnt keepWork in groups and discuss some ways we can protect animals.Write down your ideas.