本課時包括 Starting ut和 Understanding ideas兩部分。
Starting ut是導人部分，包括觀看視頻回答問題和觀察圖片回答問題兩個環(huán)節(jié)。通過問答部分將學生的思路引人生態(tài)系統(tǒng)遭到破壞的話題，緊扣單元主題。通過對比1990年到2010年這20年間位于中亞的咸海在衛(wèi)星地圖下的變化，讓學生觀察到咸海在短短的20年里，由原來的水源豐富變成幾近干涸的狀況。
Understanding ideas部分講述了麥夸里島由于外來物種的入侵，島上的生態(tài)系統(tǒng)遭到破壞，人們又想方設法維持生態(tài)平衡。后來，生態(tài)系統(tǒng)逐漸恢復。警醒人們維持生態(tài)平衡的重要性。
課時目標：
1.認知并靈活運用本課時的重點單詞 halfway dramatically、heritage、inhabitant、penguin、habitat、rat、subsequently、appetite、multiply、vegetatin、ersin、chas、cnservatin、ⅵrus、decrease、trap、departure、Immunity、explde、cllapse、substantial、incident、interventin、we、eclgy和短語 take place、in harmny with、take ver、develp an appetite fr、sil ersin、the number f、in turn、lead t、die ut、ut f cntrl、cme up with、remve…frm…、in cnsequence、be used t d sth、turn ut、nce again、nce and fr all，participate in、we…t…、n the rad t、save frm、infrm sb f sth、entertain sb with sth、by accident、apply…t…等。
2.通過速讀精讀等方式，引導學生由淺入深，逐層推進，加深對文章的理解，并掌握不同的閱讀技巧和方法。通過對所設置題目的解答，讓學生學會根據(jù)關鍵詞提取重要信息，理清文章線索，并學會深層次分析問題，進行語言加工，提高歸納概括、推理判斷的能力。
3.通過閱讀文章，了解保持生態(tài)平衡的重要性，每個人都要懷有環(huán)保理念，保護環(huán)境，保護大自然。
重點難點：
重點：
學習、掌握本課的重點單詞 halfway、dramatically、heritage、inhabitant、habitat、appetite、multiply、vegetatin、ersin、cnservatin、decrease、trap、departure、explde、substantial、incident、interventin、we和短語 in harmny with、take ver、develp an appetite fr、die ut、ut f cntrl、cme up with、remve…frm…In cnsequence、be used t d sth、turn ut、participate in、we…t…、infrm sb f sth、entertain sb with sth、by accident、apply…t…及句型，并能在具體語境中選用合適的形式進行靈活運用。
難點：
1.通過解決閱讀階段所設置的題目，學會分析問題、解決問題，理清文章脈絡，提高閱讀水平
2.通過閱讀文章，了解外來物種對本地生態(tài)系統(tǒng)的破壞，明白引進外來物種要慎重。
教學準備：
教師準備：
1.準備好該部分內(nèi)容的視頻材料、PPT以及音頻素材。
2.設計好閱讀理解題目，利用不同方式拓展語言點激發(fā)學生學習的興趣。
學生準備：
1.在網(wǎng)上搜索了解麥夸里島從喧囂到被保護的變遷，了解保護麥夸里島以及整個生態(tài)系統(tǒng)的重要性。
2.思考為了維持生態(tài)平衡，我們應該怎樣做，我們應該怎樣過綠色、環(huán)保的生活。
3.預習 Starting ut和 Understanding ideas兩部分的內(nèi)容，通過查字典等方式提前解決詞匯問題。
教學過程：
Step I Starting ut
1.Watch the vide and answer the questins
·Are humans part f Earths ecsystems? Why?
·In what ways can humans affect ecsystems?
2. Lk at the satellite images and answer the questins.
·What is happening t the area accrding t the satellite images?
·What d yu think a later satellite image wuld shw?
·What d yu think caused these changes?
【設計意圖】通過這兩個活動，將學生們迅速帶入維持生態(tài)平衡、保護自然的話題當中，為后面的學習熱身，做好準備。
Step II Reading
1. Pre-reading.
Lk at the picture belw 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?
2. Fast reading.
(1) Read the passage and find ut what happened Macquarie Island.
(2) Match the main ideas with the paragraphs.
Para. 1: _____________________________________
Para. 2: _____________________________________
Para.3: __________________________________________
Para.4: __________________________________________
(3) Read the passage quickly and answer the fllwing questins.
【設計意圖】通過圖片將學生帶入到小丑的話題，引導學生積極、認真地準備，與全班分享自已對小丑的認知，對學生主動投入課堂活動具有積極的意義。另外，也營造了樂分享、樂溝通的課堂氛圍。
【設計意圖】通過快速閱讀回答問題，引導學生做這類題要抓住關鍵信息，確定具體的段落，然后再找到問題的答案，即原文定位法。此題的設置對學生閱讀理解能力、概括歸納能力都是一種很好的鍛煉，有助于提高學生分析問題、解決問題的能力。
3.Careful reading.
(1)Language pints.
Master the wrds and phrases:
halfway，dramatically，heritage，inhabitant，habitat，appetite，multiply，vegetatin，ersin，cnservatin，decrease，trap，departure，explde，substantial，incident，interventin，we，in harmny with，take ver，develp an appetite fr，die ut，ut f cntrl，cme up with remve…frm…，in cnsequence，be used t d sth，turn ut，participate in，，infrm sb f sth，entertain sb with sth，by accident，apply…t…
【備注】詞匯知識點講解詳見第二教案“新知探究”。
(2)Read the passage again and retell it.
【設計意圖】通過設置該題，進一步歸納、概括文章，理清文章脈絡，有助于學生更好地加深對文章的理解，同時，在讀懂語篇的基礎上，將英語詞匯、句法知識融合在一起，更科學地反映學生的口頭表達能力和英語綜合能力。
4. pst-reading.
(1) D Activity 3 n Page 52.
Chse the authrs purpse in writing the passage and give yur reasns.
①T analyse hw Macquarie Island was saved frm destructin
②T infrm readers f the chas caused n Macquarie Island by humans
③T entertain readers with a funny stry abut what happened n Macquarie Island.
④T suggest ways in which an ecsystem can be prtected
【設計意圖】該活動是寫作意圖題。此類題型要求學生根據(jù)文章的論述，推測作者的寫作意圖及應用某種寫作手法的目的。作者一般不直接陳述自己的意圖，而是通過文章所提供的客觀事實使讀者信服某種想法或觀點。這類題型要求考生不僅能理解文章的內(nèi)容，還要具備對作者所闡述的問題及使用的寫作手法進行分析和總結的能力。
(2) D Activity 4 n Page 52.
① Organise infrmatin frm the passage and cmplete the flw chart.
②Talk abut hw human interference led t such severe cnsequences fr Macquarie Island.
【設計意圖】該活動以思維導圖的形式，將麥夸里島的生態(tài)平衡遭到破壞的原因和過程清晰地呈現(xiàn)出來，有助于學生理清文章主線、獲取關鍵信息，引導學生抓住題目中的關鍵詞，回扣原文，通過原文定位法，找到問題的答案。
Step Ⅲ Summing up
1.總結本節(jié)課的重點單詞 halfway、dramatically heritage、inhabitant、habitat、appetite、multiply、vegetatin ersin、cnservatin、decrease、trap、departure、explde、substantial、incident、Interventin、we和短語 in harmny with、take ver、develp an appetite fr、die ut、ut f cntrl、cme up with、remve…frm…、In cnsequence、be used t d sth、turn ut、participate in、we…t…、infrm sb f sth、entertain sb with sth、by accident、apply…t…及句型，采用表格、思維導圖等形式使學生更清晰地了解它們的用法，形成知識脈絡。
2.讓學生簡短介紹麥夸里島生態(tài)平衡遭到破壞和恢復的過程，進一步鍛煉學生概括、歸納的能力。
3.通過閱讀關于麥夸里島的生態(tài)系統(tǒng)的內(nèi)容，引導學生理解隨著經(jīng)濟的發(fā)展、科學的進步及生產(chǎn)力的提高，對資源的過度利用，使人類付出了巨大的環(huán)境代價。大氣污染、水源污染、水土流失、各種資源的逐漸貧乏等都對人類提出了各種警示，讓人類認識到生態(tài)平衡的重要性，認識到保護環(huán)境對生態(tài)系統(tǒng)的重要性。因此，近年來，隨著社會文明的發(fā)展，人們越來越重視環(huán)境保護，也越來越注重
維護生態(tài)系統(tǒng)的平衡。
Step IV Hmewrk
1. Sum up what we learnt in class and take ntes.
2. Preview the next perid.
板書設計
Suggested answers：
·Yes. Humans are part f Earths ecsystems Because all the living things live in ecsystems and peple are living things.
·Humans can affect ecsystems in psitive and negative ways. Fr example, t have a psitive influence n ecsystems, peple can plant trees, feed and prtect animals, recycle things, etc. Hwever defrestatin, air and water pllutin and excessive waste affect ecsystems in a negative way.
Suggested answers：
Aral Sea is becming smaller and smaller/shrinking
·（略）
Suggested answer：
·（略）
·They wuld hunt the birds and eat the native vegetatin, thus upsetting the lcal eclgical balance.
Suggested answer:
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 islands eclgy is n the rad t recvery with human effrts.
A. T prtect native animals, invading animals species had t be remved.
B. Fr bilgical chain, the island’s recent stry is really a tragic stry.
C. Fr sme reasns, there were n cats in 2000.
D. Macquarie Island is a UNESCO Wrld heritage Site.
E. Because f bilgical chain, parakeets, the native t the island died ut.
F. The rat, muse and rabbit prblem shuld be slved nce and fr all.
Suggested answers:
Para. 1-D; Para 2-B; Para 3-E; Para 4-C; Para, 5-F: Para. 6-A
1.Why is Macquarie Island a UNESCO Wrld Heritage Site?
Because it is halfway between Australia and Antarctica.
B. Because it is in the Suth-west Pacific Ocean.
C. Because many visitrs like t g there.
D. Because there are many precius native inhabitants.
2.What is the purpse f the island s intrductin f cat?
T kill rats and mice.
B T take ver the island.
C. T be fd fr the birds.
D. T bring the island clurful.
3.What was the cause f the parakeets, dying ut?
A. Their number was t large.
B. The rabbits liked t eat them.
C. T many cats hunted the parakeets.
D. The parakeets were eaten up by visitrs.
4.When did the island have n cats?
A. in the 1970s.
B. In the 1980s.
C. in2000.
D. In20066.
5.Where des this passage prbably cme frm?
A. ATV interview.
B. a bilgic reprt.
C. a fd advertisement.
D. a bk review.
Suggested answers:
1~5 DACCB
Suggested answers：
·①
·Reasns:（略）
Suggested answers：
ACTION(S)
PURPOSE(S)
RESULT(S)
Humans arrived n
Macquarie Island.
T live there.
Rats and mice were brught there by accident, and they tk ver the island, eating the birds’ eggs and attacking baby birds.
Cats were
brught t
the island.
T cntrl the
rats and mice
The cats develped an appetite fr the birds.
Rabbits were
intrduced t
the island.
T prvide
fd fr humans.
Rabbits multiplied and caused sil ersin, and 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.
A virus was
released nt
the island.
T remve all the rabbits frm the
Island
Substantial reductin f rabbit ppulatin led tcats killing mre native birds.
Traps and dgs were used.
T catch the cats.
The departure f the cats resulted in an increasing ppulatin f rats and mice. And the rabbit ppulatin explded nce again.
Pisn and dgs were used.
T remve all the remaining invadings pecies.
The island was pest-free and Its eclgy is n the rad t recvery.
Unit 51 A delicate wrld
Perid I Starting ut & Understanding ideas
I. Starting ut
1. Watch the vide and answer the questins.
2. Lk at the satellite images and answer the questins.
Ⅱ. Reading
1.Pre-reading.
Lk at the picture belw and answer the questins.
2. Fast reading
(1) Read the passage and find ut what happened t Macquarie Island.
(2) Match the main ideas with the paragraphs.
(3) Read the passage quickly and answer the fllwing questins.
3. Careful reading.
(1) Language pints.
Master the wrds and phrases:
halfway, dramatically, heritage, inhabitant, habitat appetite, multiply, vegetatin, ersin, cnservatin, decrease, trap, departure, explde, substantial, incident, interventin, we, in harmny with, take ver, develp an appetite fr, die ut, ut f cntrl, cme up with, remve…frm…, in cnsequence, be used t d sth, turn ut, participate in, we... t …, infrm sb f sth, entertain sb with sth, by accident apply… t…
(2) Read the passage again and retell it.
4. Pst-reading.
(1) D Activity 3 n Page 52.
(2) D Activity4 n Page 52.
Ⅲ. Summing up
Ⅳ. Hmewrk

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