第四课时Section B (1a1d)Unit 7Whats the highest mountain in the world?weigh的用法作及物动词，表示“称的重量”。eg：Cao Chong thought of a way to weigh the elephant.曹冲想出了一个称大象的办法。作不及物动词，表示“重”，后接数字。eg：She weighs 50 kilos.她的体重是50千克。【拓展】weight名词，意为“体重；重量”。倍数表达法1用形容词表示甲是乙的几倍时，有以下三个句型：倍数形容词/副词比较级thaneg：This hall is four times bigger than my classroom.这个大厅比我们的教室大四倍。倍数as形容词/副词aseg：Asia is four times as large as Europe.亚洲的面积是欧洲的四倍。倍数the size (height，length.)ofeg：The hill is four times the height of that small one.这座山的高度是那座小山的四倍。2用名词表示“量”的倍数时，有以下两个句型：倍数more名词thaneg：There are four times more books in our library than in yours.我们图书馆的藏书(数量)是你们图书馆的四倍。倍数as many/much名词其他aseg：There is three times as much water in this cup as in that one.这个杯子里的水(量)是那个杯子里的三倍。 重点短语归纳at birth出生时live up to活到一、单项选择。( )1.Linda，you look thinner.How much do you _ now?About 50 kilos.AdevelopBriseCdropDweigh( )2.Becoming a father means that he is a(n) _ now.Aadult Bgentleman Cforce DnatureDA( )3.John Smith is _ of the two young men.Astrong Bstronger Cthe stronger Dthe strongest( )4.The Sahara is about 210 _ the Taklamakan，the largest desert in China.Atimes as large as Btimes as larger asCtime as larger as Dtimes larger( )5.I know _ about this city than you，so tell me some please.Alittle Bmore Cless DmuchCAC( )6.The worlds population is growing _ and there is _ land and water for growing rice.Alarger；less Blarger；fewerCmore；less Dmore；fewer( )7.Tom is six and he is _ his sister Jane.How old is Jane?Three.Atwice as old as Bas twice old asCas old as twice Das old twice asAA二、根据汉语意思完成句子。8他爸爸的体重是他的三倍。His father weighs him.9将来人们可以活到200岁。People will 200 years.10这棵树比那棵高两米。The tree is than that one.11它每天吃掉两公斤食物。It eats two kilos of food 12熊猫可以两条腿站立。Pandas can stand 13婴儿出生时通常闭着眼睛。A baby usually closes his eyes three times as much aslive up totwo meters tallera dayon two legsat birth三、根据对话内容，从方框中选择恰当的选项补全对话，其中有两项多余。A：Hi，friends！Welcome to my town.Im your guide，Miss Lin.You can ask me anything.B：OK.14._A：Its over 45，000.B：15._A：Its over 1，000 years old.Its an old town.B：Wow，its so old.16._A：Qin River.Its more than 800 meters.B：17._AHow old is it?FACDBWhats the matter?CWhich is the longest river here?DWhere is it?EWhy dont we take a bus there?FWhats the population of your town?GHow far is it from here?A：Its in the southwest (西南) of our town.B：18._A：Its about 3 kilometers.Ill take you there later.B：I see.Thank you.G