外研版 (2019)選擇性必修第一冊Unit 5 Revealing nature教案-教案下載-教習(xí)網(wǎng)

本課時涉及的是語言知識運用，包括 Past perfect和Bidiversity兩部分：Past perfect講解過去完成時的用法，幫助分類總結(jié)過去完成時的用法特點以及常見的時間狀語。Bidiversity部分通過聽力和閱讀材料引導(dǎo)學(xué)生了解物種的多樣性。
課時目標(biāo)
1.掌握本課時的重點單詞 characteristic、decline、blame、primitive和短語 be native t、make imprtant discveries、in particular、be harmful t、be hme t、by cntrast、grw up t、carry ut、serve as的用法，并能在真實語境中靈活運用。
2.掌握過去完成時的用法。
3.幫助學(xué)生了解與物種多樣性、自然界相關(guān)的話題內(nèi)容，并能夠恰當(dāng)?shù)剡\用功能表達(dá)詢問信息、補充信息。
4.通過學(xué)習(xí)了解生物的多樣性，激發(fā)學(xué)生探索大自然奧秘的熱情，進(jìn)而更加熱愛自然、保護自然。
重點難點：
重點：
過去完成時的用法。
難點：
1.過去完成時的用法。
2.學(xué)會該部分重點單詞、短語和句型的用法。
教學(xué)準(zhǔn)備：
教師準(zhǔn)備：
1.做好該部分內(nèi)容的PPT和音頻材料。
2.準(zhǔn)備好一些關(guān)于物種多樣性的圖片或視頻資料，讓學(xué)生進(jìn)一步了解自然界中生物的多樣性。
學(xué)生準(zhǔn)備：
1.課前總結(jié)和概括自己掌握的過去完成時的用法。
2.上網(wǎng)查找關(guān)于物種多樣性的資料，獲取更多以生物多樣性著稱的加拉帕戈斯群島的信息。
3.預(yù)習(xí)課本內(nèi)容，找出該部分的新詞匯，并根據(jù)上下文猜測其含義。
教學(xué)過程：
Step Ⅰ Grammar—Past perfect
1. D Activity 1 n Page 53.
Lk at the sentences frm the reading passage and answer the questins.
·In sentence (a), which actin happened first,“suspected”r“evlved frm a cmmn ancestr”?
·In sentence(b), which actin happened first,“refused t believe”r“evlved frm lwer frms f life”?
·What des the structure had dne indicate?
2. Give mre examples with the past perfect tense. Guide students t summarise its use in their wn wrds. Then ask them t give examples.
3. D Activity 2 n Page 53.
Cmplete the paragraphs with the infrmatin frm the given sentences. The sentences are in the rder in which they happened. They can help yu t decide the use f tenses.
4. D Activities 3&4 n Page 53.
(1) Cmplete the nline encyclpaedia entry with the crrect frm f the wrds in the bx.
（2）Wrk in pairs.
Act ut a rle-play using the infrmatin in Activity 3.One f yu will play the keeper f Lnesme Gerge，and the ther will play the reprter asking abut Gerge. Use the past perfect tense where apprpriate.
【備注】語法知識點講解詳見第二教案“重點語法精講”。
【設(shè)計意圖】這幾個活動的設(shè)置，既緊扣單元話題，又在具體語境中練習(xí)了語法知識，鍛煉了學(xué)生分析問題、解決問題的能力，同時也提升了學(xué)生探究問題的能力。
Step Ⅱ Bidiversity
1. D Activity 5 n Page 54.
Listen t the pdcast and chse the statements that are made.
①Bidiversity is imprtant.
②Bacteria are always harmful t humans.
③Sme species f bacteria are used in fd prductin.
④Many species f bacteria recycle dead rganic matter.
⑤Our immune systems are able t fight ff all germs.
2. D Activity 6 n Page 54.
Listen again and cmplete the fact sheet.
3.D Activities 7 n Page 54.
Cmplete the bxes with the expressins frm the pdcast.
Checking backgrund knwledge
Adding infrmatin
4. D Activity 8 n Page 54.
Read the passage and answer the questins.
·What species are mentined and what is special abut them?
·What ther unusual life frms d yu knw f ?
【設(shè)計意圖】通過活動5和活動6，引導(dǎo)學(xué)生進(jìn)一步了解生物的多樣性。通過交際用語的使用，鍛煉學(xué)生的口語表達(dá)能力，提升語言交際能力。
5.D Activities 9&10 n Page 55.
（1）Cmplete the paragraphs with the crrect frm f the wrds and expressins in the bx.
【設(shè)計意圖】熟讀文章，在合適的位置選用詞匯的正確形式填空，既鞏固學(xué)生對詞匯的理解與認(rèn)知，鍛煉了學(xué)生對篇章的理解能力，又提升了學(xué)生的語言運用能力。同時，進(jìn)一步鞏固了所學(xué)語法知識。
（2）Wrk in pairs.
Lk at the pictures f the species native t different regins f China. Talk abut bidiversity in China using the wrds and expressins in this sectin. D nline research t find mre infrmatin.
Step Ⅲ Exercises
Fill in the blanks with the crrect frms f the wrds in the brackets.
【設(shè)計意圖】通過具體的練習(xí)，引導(dǎo)學(xué)生學(xué)會利用時間軸分析語境，理清動作的先后關(guān)系，選用正確的時態(tài)。
Step IV Summing up
總結(jié)過去完成時的用法，并注意該部分新學(xué)詞匯的運用。
Step V Hmewrk
1. Give students sme examples t fill in the blanks with the past perfect tense.
2. Master the usages f the new vcabulary.
板書設(shè)計：
Suggested answers：
·In sentence (a),“evlved frm a cmmn ancestr”happened first.
·In sentence(b), “evlved frm lwer frms f life”happened first.
·It indicates the actin happened befre a certain past actin.
(1)a Natural disasters led t fd shrtages in the 1960s.
b Yuan Lngping began t d research n hybrid rice.
c Yuan Lngping develped a better type f rice.
Yuan Lngping①____________t d research n hybrid rice because natural disasters②____________fd shrtages in the 1960s. In the end, he③____________ a better type f rice.
(2)a Gregr Mendel chse t study pea plants because their characteristics were easy t cntrl.
b Gregr Mendel made imprtant discveries abut genetics.
c Gregr Mendel died in 1884.
Gregr Mendel④____________study pea plants because their characteristics were easy t cntrl. By the time f his death in 1884, he⑤____________ imprtant discveries abut genetics.
Suggested answers：
① began ② had led t ③ develped ④ chse t ⑤ had made
cmpete decline eat live intrduce arrive
Lnesme Gerge
Lnesme Gerge was the last Pinta Island trtise. He died in 2012. After Gerge’s death, the Pinta Island trtise was declared extinct.
The extinctin f the Pinta Island trtise is blamed n humans. Befre
humans①____________n the island. the species②____________in islatin and③____________the plants that naturally grew there. Gerge was discvered many years after their arrival，and by then humans④____________new species that⑤____________fr the fd the trtises ate. After gats in particular had been brught t the island，the Pinta Island trtise ppulatin⑥____________.Eventually，nly Gerge remained.
Suggested answers：
① arrived ② had lived ③ eaten ④ had intrduced ⑤ cmpeted
⑥ declined
Suggested answers：
③④
Cells
·Every living thing is①____________.They are like②____________.
·In the human bdy there are abut③____________human cells and arund ④____________bacteria cells.
Bacteria
·Mst bacteria in the human bdy can⑤____________.
·In the fd prductin prcess, bacteria can ⑥____________dead rganic matter.
Suggested answers：
①made up f cells
②bricks that are used t build huses
③thirty trillin
④thirty-nine trillin
⑤help with digestin
⑥break dwn
D yu knw
Have yu heard
By the way,...
In fact,…
Actually,…
Speaking f which,…
Suggested answers：
·Checking backgrund knwledge
D yu knw abut…?
Have yu heard
·Adding infrmatin
by the way,…
Actually,…
In fact,…
Speaking f which,…
Suggested answers：
·Tw species are mentined：the blue whale and the water bear. The blue whale is the largest animal species n Earth，which can grw up t almst 30 metres in length and weigh ver 130，000 kils. The water bear is prbably the tughest species，which can survive temperatures frm 150℃ t a belw freezing-272℃.
·（略）
ancestr scientific be native t primitive
habitat appearance be hme t ecsystem
The Galápags Islands are renwned wrldwide fr their unique bidiversity. The Giant Trtise Reserve n Santa Cruz①__________several species f giant trtise that②__________the Galápags Islands. The island is als hme t the Charles Darwin Research Statin, where③__________studies are carried ut.
Mangrves are ne f the castal plants that grw n Isabela. They serve as the ④__________fr varius birds and fish, and are very imprtant t the ⑤__________.
Iguanas can be fund n San Cristóbal. They have a very special⑥______,with cmb-like spines n their back. There is evidence that all the different iguanas have develped frm mre ⑦_(dá)_________nes and share a cmmn⑧__________.
Suggested answers：
① is hme t ② are native t ③ scientific ④ habitats
⑤ ecsystem ⑥ appearance ⑦ primitive ⑧ ancestr
①By nine ’clck last night, we__________(get)200 pictures frm the spaceship.
②I__________ (be) at the bus stp fr 20 minutes when a bus finally came.
③He said he__________ (wrk) in that factry since 1949.
④I didn’t knw these wrds, fr I __________(nt study) my lessn.
⑤We __________(learn) ver tw thusand English wrds by the end f last term.
Suggested answers：
① had gt ② had been ③ had wrked ④ had nt studied ⑤ had learnt
Unit 5 Revealing nature
Perid II Using language
I Grammar—Past perfect
1. D Activity 1 n Page 53.
2. Give mre examples with the past perfect tense and summarise its use.
3. D Activity 2 n Page 53.
4. D Activities 3 &4 n Page 53.
Ⅱ. Bidiversity
1. D Activity 5 n Page 54.
2. D Activity 6 n Page 54.
3. D activity 7 n Page 54.
4. D Activity 8 n Page 54.
5. D Activities 9&10 n Page 55.
Ⅲ. Exercises
IV. Summing up
V. Hmewrk

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