高中英语外研版 (2019)选择性必修 第二册Unit 5 A delicate world教学演示ppt课件

这是一份高中英语外研版 (2019)选择性必修 第二册Unit 5 A delicate world教学演示ppt课件，共46页。PPT课件主要包含了Australia，Antarctica，South-west，long，thin，strong，bare rock，royal，king，eat等内容，欢迎下载使用。

Starting Out
Starting ut
1. Watch the vide and answer the questins.
1) Are humans part f Earth’s ecsystems? Why?
2) In what ways can humans affect ecsystems?
2. Lk at the satellite images and answer the questins.
1) What is happening t the area accrding t the satellite images?2) What d yu think a later satellite image wuld shw?3) What d yu think caused these changes?
The water area is shrinking.
The water area will be smaller.
Perhaps because f human ver-explitatin.
The Aral Sea
The Aral Sea lies between Uzbekistan (t the suth) and Kazakhstan (t the nrth). Once the furth largest lake in the wrld, the Aral Sea is nw less than half f its riginal size. The Aral Sea is a terminal, r endrheic, sea (meaning n water flws ut f it). It is fed by the Syr Darya and the Amu Darya Rivers, but Sviet river diversins fr irrigatin made ver 40 years ag have starved the Aral Sea f water.In 2001, the Wrld Bank funded the cnstructin f an 8-mile dam t separate the Nrth and Suth Aral, and thereby save the smaller and less plluted Nrth Aral Sea. The Nrth Aral has been grwing since cmpletin f the Kk-Aral Dam in the summer f 2005. Repairs and updates t the inefficient Sviet-era canals have als played a rle in the rejuvenatin f the Nrth Aral.
Understanding Ideas
Macquarie Island lies in the Suth- west Pacific Ocean, halfway between Australia and Antarctica. Its native inhabitants encuntered challenges. Human interventin led t the ersin f the riginal habitat, cased chas and destryed the eclgy dramatically.
What animals can yu see in the picture?What kind f changes wuld take place if cats, rats and rabbits were intrduced t an envirnment like this?
Match the main idea with its crrespnding paragraph.
ADD YOUR TITLE HERE
in the ____________Pacific Ocean between ________
_______ and _______ shape caused by _______ wind and ___________
___________ and ________ cntrast ___________
a _________ and ________ beauty
________ and _______ penguins, _________
and _________
Pacific Ocean
green grass
dramatically
UNESCO Wrld Heritage Site
elephant seals
______ n the island and __________ brught
develp an _______
What were intrduced then?
Read para 2 and cmpletethe mindmap.
A tragic stry
Cats were brught t the island.
they tk ver the island, eating the birds’ eggs and attacking baby birds
The cats develped an appetite fr the birds.
Rabbits were intrduced t the island.
T prvide fd fr humans.
the explding rabbit ppulatin prvided plentiful fd fr the cats. This led t mre cats hunting the birds. As a result, parakeets died ut in 1891.
Read paragraph 4~ 5 and draw a mindmap t shw their cnnectins
While the cat’s away, the mice will play
What cnclusin did humans draw frm the incident?
This incident made it clear that the rat, muse and rabbit prblem needed slving nce and fr all
A virus was released nt the island.
Traps and dgs were used.
Pisn and dgs were used.
T remve all the rabbits frm the island.
T catch the cats.
T remve all the remaining invading species.
Substantial reductin f rabbit ppulatin led t cats killing mre native birds.
The departure f the cats resulted in an increasing ppulatin f rats and mice. And the rabbit ppulatin explded nce again.
The island is pest-free and its eclgy is n the rad t recvery.
单击此处可编辑内容，根据您的需要自由拉伸文本框大小
Read paragraph 6 and answer these questins
What’s the writer’s missin n the island?What did humans d n the island?
S I am here n Macquarie Island t participate in the prgramme t tackle this very prblem. The first step invlved pisn being drpped frm helicpters. The next step is t remve the last remaining invading species, and that’s where I cme in—with my dgs. They have been trained t find every last ne, withut harming the native animals
It is _________ that have damaged the __________ f the Macquarie island and it is humans’ _________ t help it return t ________.
This interventin is a lng, much-delayed ending t a sad stry, but we humans we it t the island t give it a happy ending.
Pstscript: In 2014, Macquarie Island was declared pest-free and the island’s eclgy is finally n the rad t recvery.
Humans brke the _______ f the ________
Humans tried t _________ the _______
T analyse hw Macquarie Island was saved frm destructin.T infrm readers f the chas caused n Macquarie Island by humans.T entertain readers with a funny stry abut what happened n Macquarie Island.T suggest ways in which an ecsystem can be prtected.
Chse the authr’s purpse in writing the passage and give yur reasns.
Nw talk abut hw human interference led t such severe cnsequence fr Macquarie Island.
Pst-reading: Think and share
What is yur understanding f “... we humans we it t the island t give it a happy ending” ?
Share yur wn answers.
2. D yu think it was right t eradicate the “pests” frm Macquarie Island? Give yur reasns.
3. Hw culd similar situatins be avided in the future?
T avid similar situatins in the future, we shuld prtect the natural ecsystem and be aware f the ptential impact that human activities can have n ecsystems.
Language pints
1）设陷阱捕捉；夹住；卡住 Eg: It’s cruel t trap birds. 捕鸟是残忍的。2）把……困住；使陷入困境 Eg: Having been trapped in traffic, he was late fr wrk. 因为交通堵塞，他上班迟到了。
Language pints: Imprtant wrds
1. trap v. （trapped, trapped）
trap n. 1) 陷阱；夹子；罗网 set a trap fr mice 设夹子捉老鼠 2) （陷害人的）圈套；诡计 fall int a trap 落入圈套 3) 牢笼；困境 Sme peple feel that marriage is a trap. 有人认为婚姻是牢笼。
adj. dramatic
[C]（一出）戏；戏剧性事件[U] 戏剧；戏剧艺术；戏剧文学
1. 戏剧的；戏剧性的the dramatic arts 戏剧艺术2. 突然的a dramatic increase 剧增3. 给人印象深刻的a dramatic victry 激动人心的胜利
adv. 显著地；戏剧地；引人注目地
3. harmny n. 和谐；和睦；融洽
Language pints: Imprtant wrds and expressins
In this heavenly wrld, peple live in perfect harmny with nature.在这天堂般的世界里，人与自然和谐相处。
harmnius adj. 和谐的；和睦的； harmnius sciety 和谐社会
The “Chinese Dream” is a dream t imprve peple’s well-being and a dream f harmny, peace and develpment.中国梦是提高人民幸福感的梦，是和谐、和平与发展的梦。
4. explde v.
The firewrk explded in his hand.那个爆竹在他手里响了。
2) （感情、暴力事件）爆发；激增 explde with anger 勃然大怒
Flrida’s ppulatin explded after Wrld War Ⅱ.二战后，佛罗里达州的人口迅速增加。
1) 使爆炸 explde a bmb 引爆炸弹
1. fail t d sth2. in harmny with3. develp an appetite fr4. be intrduced t 5. sil ersin6. ut f cntrl
7. remve ... frm8. decrease frm ... t9. in cnsequence10. turn ut11. a substantial number f12. nce and fr all13. every last14. we it t sb t d sth
Language pints: Imprtant phrases
原来是；结果是，证明是
(认为)应该为某人做某事
1. Nr wuld they fail t imagine hw its native inhabitants, including ryal penguins, king penguins, and elephant seals, existed in perfect harmny with their natural habitat fr thusands f years.
Language pints: Imprtant sentences
Paraphrase: They culdn’t help but imagine hw its native inhabitants, including ryal penguins, king penguins, and elephant seals, existed in cmplete unity with their natural habitat fr thusands f years.
例：1) He didn’t quit his jb, nr was he fired. 他没有辞职，也没有被解雇。 2) They culdn’t understand it at the time, and nr culd we. 他们那时无法理解这件事，我们也理解不了。
具有否定意义的副词放在句首时，句子要用部分倒装结构。
本句中nr 为否定词，它所引导的句子要用倒装语序，常见结构为：Nr + 助动词 / be 动词 / 情态动词 + 主语 + 谓语 + 其它成分
1) Never befre have I seen such a mving film.2) By n means will we give up.3) Hardly had I entered the classrm when the bell rang.
类似副词和短语还有：never, seldm, little, few, rarely, nwhere, nt until, hardly…when, n sner… than, nt nly … but als, in n way, by n means, under n circumstances etc.
fail 的其它固定搭配：fail in ding sth例：He failed in persuading Mary t g there with him. 他没能说服玛丽和他一起去。
fail t d sth 未能做成某事
例: The great bridge cannt fail t stp yu in yur tracks. 这座宏伟的大桥一定会让你止步观赏。
2. Unfrtunately, the cats subsequently develped an appetite fr the birds, t.
Paraphrase: Unfrtunately, the cats subsequently began t eat the birds, t.
develp an appetite fr ... develp a taste fr ... 对……产生兴趣develp an interest in ... develp a clse friendship with ... 与……产生亲密的友谊develp the habit f ... 养成……的习惯develp (an) immunity t ... 对……产生免疫力
例: 1）Suzy develped an interest in vilin when she was just a child. Suzy 还是小孩子的时候，就对小提琴产生了兴趣。 2） He has develped the habit f reading befre ging t bed. 他已经养成了睡前阅读的习惯。 3）They have develped (an) immunity t the virus. 他们已经对病毒产生了免疫力。
3. Lse n the island, they did what rabbits d best – they multiplied rapidly and began eating the native vegetatin and digging hles, which caused sil ersin.
Paraphrase: Rabbits were free n the island and they did what rabbits d best – they increased their numbers rapidly and began eating the lcal plants, flwers, etc and digging hles, which caused sil ersin.
1）We reached the tp f the muntain. We were tired and hungry.
形容词（短语）作状语的用法：其逻辑主语为句子的主语，是由主语相同的两个句子改写而成的。
= We reached the tp f the muntain, tired and hungry. 我们到达山顶。感觉又累又饿。
= Satisfied with it, Jane bught the bk immediately. Jane对这本书很满意，立刻就买了下来。
2）Jane was satisfied with it. She bught the bk immediately.
4. This in turn led t mre cats hunting the birds.
Paraphrase: As a result, this led t mre cats hunting the birds.
in turn 依次；轮流。还可以表示结果，相当于as a result，和下文中的 in cnsequence 同义。
例：1）The grape prductin declined greatly this year which in turn brught a rise in its price. 今年的葡萄产量大幅度下降，因此价格上涨了。 2）He was ver the age limit and in cnsequence, his applicatin was rejected. 他已超过了年龄限制，因此他的申请被拒绝了。
5. They have been trained t find every last ne, withut harming the native animals.
Paraphrase: They have been trained t find all the remaining invading species, and at the same time, they are required nt t harm the native animals.
every last 与 every single 同义，比 every 语气更强，相当于all。ne 在此代替前一句话中所说的 the last remaining invading species。
例：1) My sister ate every last biscuit. 我妹妹吃掉了所有的饼干。 2) He captured every last detail. 他抓住了每一个细节。
6.This interventin is a lng, much-delayed ending t a sad stry, but we humans we it t the island t give it a happy ending.
Paraphrase: This interventin is an ending t a sad stry which takes a lng time and is delayed much, but it’s ur respnsibility t give the island a happy ending.