高中英语外研版 (2019)选择性必修 第二册Unit 5 A delicate world多媒体教学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多媒体教学ppt课件，共45页。PPT课件主要包含了Part 01，Part 02，Die out，Part 03等内容，欢迎下载使用。
Starting ut
What is an ecsystem? Hw many ecsystems d yu knw?
A wnderful serenity has taken pssess
tundra /'tʌndrə/ 冻原
glassland 温带草原（接近苔原）
steppe 温带草原（树少的）
taiga /'taɪɡə/ 北方针叶林
prairie /ˈpreəri/ 北美草原
intertidal zne /ɪntə'taɪdəl/潮间带
savannah /sə'vænə/ 热带草原
desert /ˈdezət/ 沙漠
subtidal zne /sʌb'taɪdl/ 潮下带
cntinental shelf 大陆架
trpical rain frests 热带雨林
wetlands 湿地
deep cean zne 深海区
Artic ice packs 北极浮冰
estuary /ˈestjuəri/ 港湾
temperate rain frests 温带雨林
marine mud flat 海洋泥滩
deciduus frests 落叶森林
? Watch the vide and answer the questins.
Are humans part f Earth’s ecsystems? Why?In what ways can humans affect ecsystems?
Are humans part f Earth’s ecsystems? Why?
It’s vital fr ur human beings t take actin t prtect ur Earth.
Yes! Humans are part f Earth’s ecsystem.
We shuld be in harmny with ur envirnment.
Because all the living things live in ecsystems and peple are living things.
In what ways can humans affect ecsystems?
Psitive: peple can plant trees, feed and prtect animals, recycle things and s n.Negative: The air and water pllutin and excessive waste.
Lk at the satellite images.
Aral SeaLcated in Central Asia, between Kazakhstam t the nrth and Uzbekistan t the suth
The furth largest lake (1960s)
Just fur smaller lakes (NOW)
Watch the change f Aral Sea, answer the questins.
What is happening t the area?
The water area is shrinking.
The water area will be smaller.
What d yu think a later satellite image wuld shw?
What d yu think caused these changes?
The irrigatin prjectClimate changeVegetatin Damage...
Understanding ideas
Lk at the picture and answer the questins.
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?
They wuld hunt the birds and eat the native vegetatin, thus upsetting the lcal eclgical balance.
Read the passage and find ut what happened t Macquarie Island.
Hw much d yu knw abut Macquarie Island?
Lk thrugh the passage with the fllwing questins.
Match the paragraph(s) with crrect main ideas.
Chas caused by humans.
The prcess f preservatin.
The intrductin f the island.
The authr’s missin.
Chse the authr’s purpse in writing the passage and give yur reasns.
1　T analyse hw Macquarie Island was saved frm destructin. 2　T infrm readers f the chas caused n Macquarie Island by humans. 3　T entertain readers with a funny stry abut what happened n Macquarie Island. 4　T suggest ways in which an ecsystem can be prtected.
In the Suth-west Pacific cean , halfway between Australia and Antarctic.
Lng and thin shape caused by strng winds and strmy seas.
Green grass; bare rck; a wild and natural beauty.
Ryal penguins ; king penguins; elephant seals.
Inhabitants
Frm what aspects des the writer intrduce the island in para. 1?
Careful reading
Macquarie Island
UNESCO Wrld Heritage Site
What happened t Macquarie Island befre 1970s accrding t para. 2-3?
A tragic stry
Humans arrived n the island.
unknwingly brught
develp an appetite
Meanwhile, rabbits were intrduced t the island as a surce f fd fr humans.
multiplied quicklyeat the native vegetatindigging hlescause sil ersinmre rabbits means mre cats
Fill in the fllwing blanks with infrmatin in para.4-5
The remaining 10,000 rabbits ?The large number f mice and rats ?
Caused sme land t cllapseKilled a substantial number f penguins
Remve all the invading species nce and fr all.
Became an fficial nature reserve; A virus was released t cntrl rabbits
Traps and dgs - catch the cats.
Rabbits were reduced t 10,000.The cats - native birds.
The last cat was caught in 2000.Rats started t increase.
Read para. 6 with the fllwing questins.
What’s the authr’s missin n the island?
Remve the last remaining invading species.
Hw d yu understand the sentence “ we human we it t the island t give it a happy ending.” at the end f the passage ?
It is humans that have caused great damage t the island and it is ur duty t help it return t nrmal.
What happened t Macquarie Island？
Nn-native species intrduced t Macquarie Island attacked native birds, and led t a substantial reductin f bird ppulatin and even the extinctin f parakeets. In additin, nn-native species ate and devastated the native vegetatin. All f this played a part in upsetting the natural harmny f the island. But nw the island’s eclgy is n the rad t recvery with human effrts.
Organise infrmatin frm the passage and cmplete the flw chart.
Talk abut hw human interference led t such severe cnsequences fr Macquarie Island.
D yu think it was right t eradicate the “pests” frm Macquarie Island? Give yur reasns. Hw culd similar situatins be avided in the future? What language can yu use t talk abut cause and effect? Hw wuld yu apply it t yur reading and writing?
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.
Humans brke the balancef the ecsystem.
Humans tried t cnserve the ecsystem.
With ur jint effrts, ur cuntry is sure t becme a mre hspitable place. We shuld live harmniusly with nature.
Language pints
in perfect harmny with their natural habitat fr thusands f years. 数千年来，……与其自然栖息地完美地和谐共存。in harmny with 与……和谐；与……一致【归纳拓展】live/wrk in harmny 融洽地生活/ 工作harmnius adj. 和睦的，融洽的；悦耳的；协调的
◆完成句子(1) Human life is regarded as part f nature and the nly way fr us t survive is t___________________________（与自然和谐相处）.(2)The clurs in the rm aren’t ___________________________（彼此不协调）.◆单句语法填空(3) The sky and the sea make a 　　　　 　（harmny） picture.
live in harmny with nature 　
in harmny with each ther 　
Meanwhile， rabbits were intrduced t the island as a surce f fd fr humans. 与此同时，人们把兔子引进岛上作为食物。 把……引入……【归纳拓展】intrduce neself （t sb.）（向某人作）自我介绍 intrduce sb. t sb. 把某人介绍给某人【误区警示】intrduce后不能接双宾语，即不可以说 intrduce sb. sth.。他给我们介绍了那个新来的人。He intrduced us the newcmer.（×）He intrduced the newcmer t us.（√）【单词积累】intrductin n. 介绍；引进；序言
◆单句语法填空(1) Many new methds f teaching have been intrduced ________ ur schl since last year.(2) He _______________（intrduce）t Mr Black at that party yesterday.(3) She searched fr the _____________ （intrduce）f yga n the website.◆完成句子(4)D yu knw when the ptates____________________________（被引入中国）?(5) He just walked ver and________________________（向我作自我介绍）.
was intrduced　
intrductin　
were intrduced t/int China　
intrduced himself t me
Lse n the island，they did what rabbits d best—they multiplied rapidly ...由于在岛上放任其生存，兔子做了自己最擅长的事——飞快地繁殖……multiply v. 繁殖；（使）大大增加，（使）倍增；乘，乘以
2+2=4Tw plus/added t tw is fur.4-2=2Fur minus tw is tw./Tw subtracted frm fur is tw.2×2=4 Tw times/multiplied by tw is fur.4÷2=2Fur divided by tw is tw.
◆完成句子(1) It is reprted that smking___________________（大大增加……的风险）heart attacks and ther health prblems.(2)During ht summers，the germs_____________________（繁殖得很快），and can prduce fd pisning.◆单句语法填空(3)Our prblems_______________（multiply） since last year.(4)Ten added________ five makes fifteen.(5)12 divided_________4 equals 3.(6)Five______________（multiply）by six is thirty.(7)If yu multiply three__________ six，yu’ll get eighteen.
multiplies the risk f　　
multiply quickly/rapidly
have multiplied　
multiplied　　
But althugh the virus caused the rabbit ppulatin t decrease frm 130，000 t arund 10，000...然而，虽然病毒使得兔子的数量从130 000 只降到约10 000 只……decrease v. & n.（1）v.（使）变小，（使）减少decrease（frm...）t（从……）减少到……（表示减少的结果）decrease by 减少了……（表示减少的幅度）decrease in 在……方面减少The number f new students decreased（frm 1，200） t 900 this year.今年新生人数（从 1 200）减少到了 900。The price f wheat has decreased by 5%. 小麦价格降低了 5%。This species f bird has decreased dramatically in number. 这种鸟的数量已经急剧减少。
But althugh the virus caused the rabbit ppulatin t decrease frm 130，000 t arund 10，000...然而，虽然病毒使得兔子的数量从130 000 只降到约10 000 只……decrease v. & n.（2） n. 减少，减少的量a decrease in...……的减少 n the decrease 在减少There has been a decrease in traffic accidents. 交通事故减少了。The charge fr transprtatin is n the decrease because f lwer fuel csts. 由于更低的燃料花费，运输费用在降低。【归纳拓展】increase v. & n. 增加，增长increase t 增加到……（表示增加的结果）increase by 增加了……（表示增加的幅度）increase in 在……方面增加 n the increase 在增加
◆单句语法填空(1) Traffic accidents _________________（decrease）in frequency ver recent years.(2) The number f independent firms decreased________ 296 ________ 198.(3) The prductin cst f this kind f car has decreased ________ ten percent.(4) The number f peple cmmenting n the matter is ________ the decrease.(5) The ppulatin f the regin is ________ the increase year by year. It has increased ______ three millin s far.◆完成句子(6) T be frank with yu，the ppulatin in ur cuntry is ________________（在减少）.(7)Accrding t the news agency，the number f peple injured in the traffic accident __________________（已经上升到）95.(9)We aim t ___________________________（将销售额提高 10%）.
have decreased　
　frm t　　　
n the decrease　
has increased t　　
increase sales by 10 percent　
In the 1980 s， traps and dgs were used t catch the cats. 20 世纪80 年代，人们利用捕猎夹和狗来抓猫。trap n. & v.（1）n. 夹子，陷阱；圈套；困境lay/set a trap（fr sb./sth.）（给某人 / 某物）设下圈套fall/walk int a trap 落入圈套（2）v.（trapped，trapped）困住；使陷入圈套be trapped in 困在……中；陷入……中trap sb. int（ding）sth. 诱使某人做某事
◆单句语法填空(1) Fire fficers used cutting equipment t free his legs，which______________ （trap） under a steel beam.(2)She had been trapped int _______（say）smething she did nt mean.(3)The car rlled nt its rf，　　　　　（trap）bth men.◆完成句子(4) At midnight we finally rescued the turists wh _________________ （被困在）the valley.(5)By clever questining they ________________________________ （诱使他说了实话）.
were trapped　　
were trapped in　　
trapped him int telling the truth　　
It turned ut that they develped an immunity t the virus ， and their numbers explded nce again. 结果它们对病毒产生了免疫力，它们的数量再次激增。turn ut 结果是，证明是；（大量）出席，参加；制造，生产【学法点拨】turn ut 作“结果是，证明是；（大量）出席，参加”讲时，是不及物动词词组，不用于被动语态；作“制造，生产”讲时，是及物动词词组。
◆完成句子(1) He gt his first bk published. It ____________（结果）t be a best-seller.(2)___________________（原来） she was the PE teacher f my sister.(3)The whle village_______________（出来）t welcme the her.(4) New technlgies have made it pssible t _____________（生产）new prducts faster and at a lwer cst.
turned ut　　
It turned ut that　　　
This incident made it clear that the rat， muse and rabbit prblem needed slving nce and fr all.这一事件清楚地表明，大鼠、小鼠和兔子泛滥的问题需要一次彻底的解决。incident n. 事件；冲突a small/minr incident 小事件a majr incident 重大事件a serius incident 严重事故a vilent incident 暴力事件【词语辨析】incident，accident 与 eventincident 可指小事件，也可指严重的、重要的或暴力的事件。accident 指偶然或意外发生的不幸的事故。event 尤指重要的事件或大事，也可指比赛项目。
◆选词填空（incident/accident/event）(1) The __________ made the listeners burst int laughter.(2)Neither yu nr the driver，I think，has tld the truth behind the _______.(3)The ________ has been put ff due t lack f interest.(4)I didn’t mean t break it—it was an __________.(5) A yuth was seriusly injured in a shting _________n Saturday night.
incident　 　
we humans we it t the island t give it a happy ending. ……但这是我们人类应该做的，我们亏欠这座岛屿一个美好的结局。we v. 应该做；对……负有……的义务；欠（债），欠（账）；归功于we it t sb. t d sth.（认为）应该为某人做某事we sb. sth. =we sth. t sb. 欠某人某物；将某事归功于某人we it t sb. that... 将……归功于某人we sb. a favur 欠某人一个人情【归纳拓展】wing t（=because f）意为“由于，因为”，引导原因状语，可位于句首、句中或句末。Owing t the rain，I bjected t ging ut.由于下雨，我不赞成外出。
◆单句语法填空(1) The jurnalist his success and happiness________ his wife and children.(2) I we ______ t yu that I made such great prgress in my spken English.(3) _________（we）t my lack f experience，I didn’t d the wrk well.(4) The cmpany wes mney 　　　　　 mre than ten banks.◆完成句子(5) He asked fr help frm a clleague wh _________________（欠他一个人情）.(6)The yung writer _____________________ （将他的成功归于）his teacher’s encuragement.
wed him a favur　
wed his success t 　
Review language pints.Please design a pster t call n the students in yur schl t prtect ur living cnditins . In the pster yu are required t list 10 practical ds and dn’ts.