外研版 (2019)选择性必修 第一册Unit 5 Revealing nature教案

这是一份外研版 (2019)选择性必修 第一册Unit 5 Revealing nature教案，共9页。教案主要包含了设计意图等内容，欢迎下载使用。

本课时涉及的是语言知识运用，包括 Past perfect和Bidiversity两部分：Past perfect讲解过去完成时的用法，帮助分类总结过去完成时的用法特点以及常见的时间状语。Bidiversity部分通过听力和阅读材料引导学生了解物种的多样性。
课时目标
1.掌握本课时的重点单词 characteristic、decline、blame、primitive和短语 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，并能在真实语境中灵活运用。
2.掌握过去完成时的用法。
3.帮助学生了解与物种多样性、自然界相关的话题内容，并能够恰当地运用功能表达询问信息、补充信息。
4.通过学习了解生物的多样性，激发学生探索大自然奥秘的热情，进而更加热爱自然、保护自然。
重点难点：
重点：
过去完成时的用法。
难点：
1.过去完成时的用法。
2.学会该部分重点单词、短语和句型的用法。
教学准备：
教师准备：
1.做好该部分内容的PPT和音频材料。
2.准备好一些关于物种多样性的图片或视频资料，让学生进一步了解自然界中生物的多样性。
学生准备：
1.课前总结和概括自己掌握的过去完成时的用法。
2.上网查找关于物种多样性的资料，获取更多以生物多样性著称的加拉帕戈斯群岛的信息。
3.预习课本内容，找出该部分的新词汇，并根据上下文猜测其含义。
教学过程：
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.
【备注】语法知识点讲解详见第二教案“重点语法精讲”。
【设计意图】这几个活动的设置，既紧扣单元话题，又在具体语境中练习了语法知识，锻炼了学生分析问题、解决问题的能力，同时也提升了学生探究问题的能力。
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 ?
【设计意图】通过活动5和活动6，引导学生进一步了解生物的多样性。通过交际用语的使用，锻炼学生的口语表达能力，提升语言交际能力。
5.D Activities 9&10 n Page 55.
（1）Cmplete the paragraphs with the crrect frm f the wrds and expressins in the bx.
【设计意图】熟读文章，在合适的位置选用词汇的正确形式填空，既巩固学生对词汇的理解与认知，锻炼了学生对篇章的理解能力，又提升了学生的语言运用能力。同时，进一步巩固了所学语法知识。
（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.
【设计意图】通过具体的练习，引导学生学会利用时间轴分析语境，理清动作的先后关系，选用正确的时态。
Step IV Summing up
总结过去完成时的用法，并注意该部分新学词汇的运用。
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.
板书设计：
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__________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