初中英语沪教牛津版(六三制)七年级下册Unit 4 Save the trees.多媒体教学ppt课件

这是一份初中英语沪教牛津版(六三制)七年级下册Unit 4 Save the trees.多媒体教学ppt课件，共40页。PPT课件主要包含了课堂导入，课堂活动，课堂小结，课堂训练等内容，欢迎下载使用。

Trees are ur friends.
Trees are imprtant in ur daily life.
In Unit 3 we talked abut ur friend: animals , in this Unit we are ging t talk abut man’s anther friend: trees
Trees are s imprtant. But hw much d yu knw abut them?
Can yu say ut the parts f the tree?
leaves(leaf)
grwth rings
What d trees d fr us ?
Trees prvide us with fruit.=Trees prvide fruit fr us.=We can get fruit frm trees.
Fruit, furniture
We can als use trees t make many things such as: chpsticks, furniture, paper and s n.
Leaves prvide shade fr peple. They can keep us cl.
We can als get il and tea frm sme special trees.
They are majr fighters against air pllutin.
They help fight against air pllutin.
Mst imprtantly, they can make the air fresh and clean.
Hw d they fight against air pllutin?
Leaves can change harmful gas int xygen, s they can makethe air fresh and clean.
prduce xygen fr us t breathe
Trees can make the wrld mre beautiful and green.
Branches prvide hme fr animals such as birds.
Branches are hme t animals such as birds.
Trees make ur lives mre cnvenient.
A What d yu knw abut…
Hw much d yu knw abut trees? Try the shrt quiz belw.1 Write dwn the names f the parts f a tree. Use the wrds frm the bx t help yu.
a. They help fight against pllutin.b. They prvide us with wd, fruit, etc.c. They are hme t birds and animals.d. All f the abve.
2 What d trees d fr us?
B Befre yu read
Lk at the pictures and the title f the interview n page 45. Then answer the questins belw.1 What d yu think the interview is abut? a. The lives f trees. b. Why trees are imprtant in ur daily lives.2 What can we make frm trees? Write dwn three examples. ____________ ____________ ____________
Trees in ur daily livesRebecca wants t knw mre abut trees and hw they help us. She is interviewing Dr Jnes abut trees.Rebecca:Hw d trees help us, Dr Jnes?Dr Jnes: They help us in many ways. They keep the air cl and clean. They take in harmful gases frm the air and prduce xygen fr us t breathe. They’re majr fighters against air pllutin.Rebecca: I knw trees als make ur lives mre cnvenient. Many f the things in ur daily lives cme frm trees. Fr example, paper and pencils.
Read the first part f the cnversatin and answer the fllwing questin.
Why are trees majr fighters against air pllutin?
They keep the air cl and clean. They take in harmful gases frm the air. They prduce xygen fr us t breathe.
Dr Jnes:Yu’re right, Rebecca. In fact, we get a lt mre frm trees. We get fruit and il frm them. Tea als cmes frm the leaves f trees. Lk arund this rm. A lt f the furniture is made f wd. Trees are really imprtant in ur daily lives.Rebecca:I can’t imagine a wrld withut trees.Dr Jnes:But we cut dwn millins f trees every year. We shuld stp ding this if we dn’t want a wrld withut trees.
Read the secnd and third part f the cnversatin and answer the fllwing questin.
FruitOilTea and furniture
What can we get frm trees?
air pllutin
mre cnvenient
cutting dwn
fruit and il
papers and pencils
The table belw tells us sme facts abut trees. Read it and cmplete the table.
1. Harmful gases are ____ peple’s health. a. gd fr b. bad fr2. Trees prduce xygen. They ___ xygen. a. take b. make3. Air pllutin is a majr prblem in the city. This prblem is ____. a. big and imprtant b. nt very imprtant
C Vcabulary
The wrds in italics are frm the article n page 45. Circle the crrect answers t cmplete these sentences.
4. Washing machines make ur lives mre cnvenient. With the help f them, ur lives becme ____. a. easier b. richer5 When yu imagine a picture, yu have it ____. a. n paper b. in yur mind
Cmplete the pster belw with the wrds frm the bx.
All abut trees Did yu knw trees(1)________ xygen?Did yu knw trees help us fight (2)______ pllutin?Did yu knw the (3)_______ in ur classrm is made f wd?Did yu knw trees make ur lives very(4)__________?If yu want t knw mre abut trees, jin ur “All abut trees” talk at 4 p.m. n 26 Octber (Tuesday). We will interview Dr Jnes abut the lives f trees and their(5)_______ uses.
Trees in ur daily livesTrees are majr fighters against ____________. They: keep the air _______________. take in _______________ frm the air and prduce xygen.Trees make ur lives ____________________.Many f the things (e.g. paper and pencils) in ur daily lives ____________.We als get fruit, il and tea frm trees.A lt f furniture is _______________.
cl and clean
harmful gases
cme frm trees
D Cmprehensin Read the interview n page 45 and cmplete the ntes belw.
Lk at these tw sentences. D yu knw the meanings f useful and harmful?Trees give us a lt f useful things. (树带给我们许多有用的东西)Trees take in harmful gases frm the air. (树木吸收空气中的有害气体)Useful and harmful bth end in -ful. It is a suffix meaning “full f”. (有益的和有害的都以ful结束。这是一个后缀，意为“充满；装满”)
Can yu guess the meanings f the fllwing wrds?
Can yu give sme mre examples?
They prvide us with wd, fruit, etc.它为我们提供木材、果实等。 prvide sb. with sth. = prvide sth. fr sb.为某人提供某物 Sheep prvide us with wl.= Sheep prvide wl fr us. 绵羊为我们提供羊毛。
Language pints
根据中文意思完成句子。 政府为村民们提供法律服务。The gvernment _______ the villagers ______legal service.= The gvernment _______ legal service ______the villagers.
prvides with
prvides fr
3. They keep the air cl and clean. 它们（树木）保持空气凉爽和清洁。keep是动词，意为“保持；继续”。常用句型有：①keep sb / sth + adj.意为“使某人/某物保持某种状态”。如：别伤心了。Dn’t keep yurself sad.
②keep ding ... 意为“继续做……”。如：机器一直运转。 The machine kept wrking.③keep sb / sth ding ...意为“让某人/某物一直/继续做……”。 如：别让火一直烧着。 Dn’t keep the fire burning.
2. in many ways 在许多方面 way作可数名词，意为“方面，方式，道路”。It’s the best way t study English. 这是学习英语最好的方法。
4. They take in harmful gases frm the air and prduce xygen fr us t breathe. 它们从空气中吸收有害的气体，制造氧气供我们呼吸。①take in 吸收Trees take in carbn dixide. 树木吸收二氧化碳。
② harmful adj. 有害的 be harmful t 对……有危害Smking is harmful t yur health. 吸烟有害健康。形容词harmful 意为“有害的”，由名词 harm 加后缀.ful 构成。后缀.ful 表示“充满……的；有……性质的”，常加在一些名词或动词后面构成形容词。如：beautiful 漂亮的；thankful 感激的。
5. fr example 例如 fr example 与 such as 的区别1) fr example “例如” +句子、段落, 用来举例说明某一论点或情况,一般只举同类人或物中的“一个”为例, 可位于句首、句中或句末。2) such as “例如”+单词、词组或动词ing，用来列举事物时,一般列举同类人或事物中的几个例子。插在被列举的事物与前面的名词之间,as后面不可有逗号。
如：We gt a lt f things frm trees. Fr example, rubber is frm rubber trees.我们从树上得到了很多东西。例如，橡胶来自于橡胶树。 China has many big cities, such as Bejing, Shanghai, Guangzhu.中国有许多大城市，例如北京、上海、广州。
6. A lt f the furniture is made f wd. 很多家具是木制的。① furnituren.家具 为不可数名词，可用a piece f, an article f以及sme, much来修饰。 我们的家具不多。 We dn't have much furniture. 床、椅子、桌子和书桌都是家具。 Beds, chairs, tables and desks are furniture.
② be made f 意为“由……制成”。如：我的课桌是木制的。 My desk is made f wd.注意区别：be made f 从产品中能看出原材料 be made frm 从产品中看不出原材料这座小桥是石头砌成的。The small bridge is made f stnes.葡萄酒是由葡萄制成的。Wine is made frm grapes.
7. But we cut dwn millins f trees every year. 但是，我们每年都砍掉大量的树木。① cut dwn 砍伐，砍倒Dn’t cut dwn the tree that gives yu shade.遮阴之树不可砍。
②millin 意为“百万”，表示具体的数目时用单数形式；表示不具体的数目时用复数形式，且与f 连用，构成短语millins f，意为“大量的；数以百万计的”。如：这栋房子价值两百万元。 The huse csts tw millin yuan.每年，数以百万计的游客来游览北京。 Every year, millins f turists cme t visit Beijing.类似millin 用法的数词还有：hundred和thusand。
【辨析】stp ding sth 意为“停止做某事”，表示不做这件事了；stp t d sth意为“停下来去做某事”，表示停下手中正在做的事，去做另一件事。请对比：当陈老师进来时，学生们都停止了说话。 The students stpped talking when Mr. Chen came in.他累了，想停下来休息一会儿。 He is tired. He wants t stp t have a rest.
8. We shuld stp ding this if we dn’t want a wrld withut trees.如果不想让这个世界没有树木，我们就应该停止这样做。stp 在本句中作动词，意为“停止”，后面可以接动词的⁃ing 形式或动词不定式，构成stp ding sth 和stp t d sth，两者的意义和用法有所区别。
1.We have read an interview abut trees.2. We have grasped the new wrds and expressins in the reading.
1.根据句意及所给单词的首字母写出所缺单词，注意其形式。1. Yu are a great dctr. Thank yu fr s______ my life.2. Can yu i______ a wrld withut air?3. Dn’t g int the rm. There is bad g______ in it.4. Eating t much sweets is h______ t ur teeth.5. I will d______ the prblem with yu this afternn.6. If yu dn’t understand, I’ll give yu anther e______ .
2. 选择最佳答案填空。1. Yu are excellent ____ many ways.A. n B. at C. in D. fr2. I was watching TV at that time. When my mther came int the rm, I stpped ____ my bk. A. reading B. read C. t read D. t reading
3. I std up t ____ when a gentle hand tuched my shulder.A. lk up B. lk arundC. lk after D. lk fr4. If yu want t ____, yu had better take exercise every day.A. keep health B. keep healthilyC. keeping health D. keep healthy
( ) 5　If yu want t ___, yu had better take exercise every day.A. keep healthB. keep healthilyC. keep healthy( ) 6　Yu have wrked fr 3 hurs. Why nt stp ___ a rest?A. t haveB. havingC. have( ) 7　We shuld stp peple ___ trees.A. cut dwnB. cutting dwnC. t cut dwn
( ) 8　– They are ___ f peple here in ur city. 　　　– Actually, there are three ___ peple here in ur city.A. millins; millinB. millins; millinsC. millin; millin( ) 9　– What a nice dress! Is it ___ silk?　　　– Yes. It’s ____ Hangzhu.A. made f; made fB. made f; made inC. made in; made f