英语八年级下册（2024）Section B教学ppt课件

这是一份英语八年级下册（2024）Section B教学ppt课件，共59页。
Unit4: The Wnders f Nature
Why d we explre nature?
第4-6课时: Sectin B (1a-reading plus)
What is the highest muntain in the wrld?
Munt Qmlangma
Pre-reading
What d yu knw abut Munt Qmlangma? Tell a partner.
View and predict
Tw grups f Chinese team climbed the Munt Qmlangma.
Munt Qmlangma is the highest muntain in the wrld. It is 8,848.86 metres high. It’s lcated n the China-Nepal brder. It’s part f the Himalayas. It is famus fr its extreme cnditins.
The first peple t reach the tp were Tenzing Nrgay and Edmund Hillary n 29 May 1953. The first Chinese team did s in 1960, while the first wman t succeed was Junk Tabei frm Japan in 1975.
While-reading
Scan the article t find the infrmatin belw.
Scanning Yu can read a text quickly t find specific infrmatin(特定信息), such as numbers, years, names, and places. Numbers and years are usually in Arabic numerals, while names and places usually start with capital letters.
1._________________ : what climbers(登山者) called the way up the nrthern side f the muntain2._________________ : the distance between the Secnd Step and sea level3._________________ : the year the first Chinese team reached the tp f Qmlangma4._________________ : the height f Qmlangma in 2020
The “Death Rad”
8,600 metres
8,848.86 metres
the distance between... and...……和……之间的距离
Text analysis
Reaching New Heights
T mst peple, Munt Qmlangma is ne f the greatest wnders f the wrld. On the highest place n earth, yu will feel like yu are able t tuch the sky. But nly the best climbers reach the tp, and that is nly if they survive the terrible cnditins first. On the muntain, temperatures can fall t -30 degrees. Climbers must als deal with thin air, high cliffs, and changeable weather.Befre 1960, n ne was able t reach the tp f Qmlangma frm the nrthern side. Muntain climbers even called that way the “Death Rad”, but a Chinese climbing team was determined t make the climb.On 24 May 1960, climbers Liu Lianman, Wang Fuzhu, Qu Yinhua, and Gngbu arrived at the Secnd Step. It was 8,600 metres abve sea level. Peple said it was s high that even birds culd nt reach it. Liu allwed his teammates t step n his shulders. Bit by bit, the climbers pulled themselves up, and they made it past the Secnd Step. At 4:20 a.m. n 25 May, the Chinese natinal flag flew abve the wrld’s highest muntain fr the first time.
ne f the+形容词最高级+可数名词复数 最……的……之一
感觉像；给……的感觉；感受到； 其后可接名词、动词-ing形式或从句
be able t d sth 能够做某事
“ 只有……才 ”，引导条件状语从句
在这里说明主语that（reach the tp）成立的前提条件
be determined t d sth 决心做某事
s... that 如此……以至于
allw sb t d sth 允许某人做某事
n ne’s shulders 在某人的肩膀上
①获得成功②（尤指在困难情况下）准时到达
In 1975, anther Chinese team climbed t the tp f Qmlangma t d research. This time, they brught a ladder t the Secnd Step. Until 2007, almst all climbers frm the nrthern side used this “Chinese Ladder” t reach the tp much faster. In 2020, a Chinese research team went t Qmlangma t measure its height—8,848.86 metres.Climbing Qmlangma is dangerus. Sme climbers reach the tp successfully, but many fail. Why d peple still risk their lives t climb the highest muntain in the wrld? It is because human curisity and ambitin cannt be stpped. Or, as the English explrer Gerge Mallry put it, it is simply “because it’s there”!
use sth t d sth 使用/利用某物做某事
risk ne’s life t d sth 冒着生命危险做某事
as sb puts it 正如某人所言put simply 简单地说put it anther way 换个说法
(1) What climbers called the way up the nrthern side f the muntain 登山者对珠峰北坡登山路线的称呼
nrthern adj. 北部的；向北的
表示方位的名词，在词尾加-ern 可构成形容词。如east+-ern→eastern （东部的；向东的） west+-ern→western （西部的；向西的）suth+-ern→suthern （南部的；向南的）
Tm lives in the nrthern part f America. 汤姆住在美国的北部。
suth n.南，南方
nrth n.北，北方
west n.西，西方
east n.东，东方
sutheast n.东南
suthwest n.西南
nrthwest n.西北
nrtheast n.东北
living/husing/wrking cnditins 生活/住房/工作条件
(2)But nly the best climbers reach the tp, and that is nly if they survive the terrible cnditins first. 但只有最优秀的登山者才能登顶，而前提是他们要在恶劣的环境中存活下来。
cnditin n. ①环境；条件 常用复数形式。
The climbers suffered frm bad wrking cnditins.登山队员们饱受恶劣工作条件之苦。
in bad/gd/excellent cnditin 处于糟糕的/良好的/极佳的状态 ut f cnditin 健康状况不佳
②[不可数名词] 状态；状况；健康状况
The car is in excellent cnditin. 这辆汽车的车况好极了。He is verweight and ut f cnditin. 他体重超重，健康状况不佳。
(3)Muntain climbers even called that way the “Death Rad”, but a Chinese climbing team was determined t make the climb. 登山者甚至称那条路线为“死亡之路”，但一支中国登山队决心完成这次攀登。
death n. 死亡；毁灭；破灭
death, die, dead与dying
非延续性动词，不能与表示一段时间的状语连用，其过去式、过去分词均为died，动词-ing 形式为dying
强调状态，可以与表示一段时间的状语连用
The vet tried t save the dying dg, but it finally died. Nw the dead dg lies quietly, and its death makes the little girl very sad. 兽医努力拯救那只垂死的狗，但它最终还是死了。现在那只死去的狗静静地躺着，它的死亡让这个小女孩非常伤心。
(4) Why d peple still risk their lives t climb the highest muntain in the wrld? 为什么人们仍然冒着生命危险去攀登这座世界最高峰？
risk ① v. 使……冒风险（或面临危险）其后可接名词（短语）、代词或动词-ing 形式作宾语.
risk ne’s life 冒着生命危险risk ding sth 冒险做某事
The fireman risked his life t save the child. 这个消防队员冒着生命危险去救那个孩子。We’d better nt risk travelling in these bad cnditins. 我们最好不要在这种糟糕的条件下冒险出行。
risk ② n.危险；风险
the risk f... ……的风险take risks/a risk 冒险
Smking can increase the risk f heart prblems.吸烟会增加患心脏病的风险。Dn’t take risks. And yu shuld think twice.不要冒险。你应该三思。
risky adj. 有危险（或风险）的
Dctrs say it’s t risky t d the peratin. 医生说动手术风险太大。
(5) It is because human curisity and ambitin cannt be stpped. 这是因为人类的好奇心和雄心壮志是无法被阻挡的。
curisity n. 好奇心；求知欲
ut f curisity 出于好奇
Children shw curisity abut everything. 儿童对一切事物都显露出好奇心。I pened the ld bx ut f curisity. 我出于好奇打开了那个旧盒子。
curius adj. 好奇的；求知欲强的 curiusly adv.好奇地be curius abut 对……好奇
ambitin n. 追求的目标；野心；雄心
ambitin t d sth/ambitin f ding sth 做某事的志向/抱负
His ambitin is t travel arund the wrld. 他的理想是环游世界。He finally achieved his ambitin f becming a prgrammer.他最终实现了当程序设计员的夙愿。
ambitius adj. 有野心的；有雄心的
He is an ambitius yung man full f enthusiasm and vitality.他是个充满热情与活力的有远大抱负的青年。
Read the article again. Match the paragraphs with the main ideas.
Paragraphs 1 and 2 Paragraphs 3 and 4 Paragraph 5
A. Achievements f Chinese teamsB. Reasns fr climbing QmlangmaC. Difficulties and dangers
Read the passage carefully and answer the questins.
1. What are the difficulties and dangers f Qmlangma?2. What’re the achievements Chinese team nce made?3. Why d peple risk their lives t climb the highest muntain in the wrld?
Temperatures can fall t -30 degrees. Climbers must als deal with thin air, high cliffs, and changeable weather. Befre 1960, n ne was able t reach the tp f Qmlangma frm the nrthern side. Muntain climbers even call that way the “Death Rad”.
①At 4:20 a.m. n 25 May 1960, the Chinese natinal flagflew abve the wrld’s highest muntain fr the first time.
②In 1975, anther Chinese team climbed t the tp f  Qmlangma t d research. They brught a ladder t the  Secnd Step. 
③In 2020, a Chinese research team returned t Qmlangma t measure its height—8,848.86 metres.
It is because human curisity and ambitin cannt be stpped and it is simply “because it’s there”!
Read again. Circle T fr true r F fr false. Then crrect the false statements.
1. A few climbers reached the tp f Qmlangma frm the nrthern side befre 1960.2. In 1960, Liu Lianman’s teammates used a ladder t get past the Secnd Step.3. The Chinese team brught a natinal flag t the tp f Qmlangma in 1960.4. The “Chinese Ladder” was placed at 8,600 metres abve sea level.5. Climbers first started t use the “Chinese Ladder” in 2007.
In 1960, Liu Lianman’s teammates stepped n his shulders t get past the Secnd Step.
N ne was able t reach the tp f Qmlangma frm the nrthern side befre 1960.
Climbers first started t use the “Chinese Ladder” in 1975.
T FT FT FT FT F
Pst-reading
Discuss the questins.
1. Hw d yu think the Chinese climbers felt when they placed(放置，安放) the natinal flag n tp f Qmlangma?2.What d yu think Gerge Mallry meant by “because it’s there”?3.What qualities d yu think a gd muntain climber needs t have?
I think they felt very prud and excited.
He desn’t have cmplicated(复杂的)reasns fr climbing it. The muntain is just there, and that’s enugh t make him want t reach its tp. Fr him, climbing Munt Qmlangma is a chice driven by curisity and ambitin, nt fr mney r fame(名望).
A gd muntain climber needs t have bth a strng bdy and a strng mind.A gd muntain climber needs t have team spirit.
Review and retell the text
Difficulties and dangers (Paras. 1~2)ne f the greatest wnders f the wrldthe highest place n earthtemperatures can fall t -30 degreesthin air, high cliffs, and changeable weatherbefre 1960, n ne reached the tp frm the nrthern side (the “Death Rad”)Reasns fr climbing Qmlangma (Para. 5)human curisity and ambitinBecause it’s there! —Gerge Mallry
Achievements f Chinese teams (Paras. 3~4)in 1960: the first Chinese teamclimbers: Liu Lianman, Wang Fuzhu, Qu Yinhua, Gngbukey step: Liu allwed his teammates t step n his shulders→ the climbers pulled themselves up→ made it past the Secnd Stepresult: the Chinese natinal flag flew n the tp (at 4:20 a.m. n 25 May)in 1975: the secnd Chinese teambrught a ladder t the Secnd StepUntil 2007, climbers frm the nrthern side used this “Chinese Ladder” t reach the tp much fasterin 2020: a Chinese research teammeasured its height—8,848.86 metres
Let’s learn
1. 死亡之路 2. 登顶 3. terrible cnditin 4. bit by bit 5. 做研究 6. 冒着生命危险 7. changeable weather
II. 用括号内所给单词的适当形式填空1. It ften snws in the (nrth) part f China in winter.2. Luckily, all the peple (survive) the terrible accident last weather here is (change) in spring — smetimes sunny, smetimes rainy.4. The (determine) by never gives up when he faces difficulties.5. The dctrs (success) saved the sick child's life last night.
I. 写出下列短语的中文或英文释义
reach the tp
risk ne's life
successfully
( )1. During the heavy rainstrm, the little bird by hiding under a big tree. A. live B. survived C. spent D. alive( )2. The weather in spring is always . It can be sunny in the mrning but rainy in the afternn. A. changeable B. cmfrtable C. dangerus D. beautiful( )3. He t save his daughter frm drwning. A. the risk f lsing his life B. take a risk f his life C. risked his life D. risk lsing his life( )4. The little girl her mind and decided t stay at hme with her mum. A. changed B. turned C. makes D. keeps( )5. After mnths f practice, she finally passing the driving test. A. succeeded in B. succeeded t C. achieved in D. achieved t
Master the new wrds and language pints.Listen, read and retell the stry.
Vcabulary in use
Match the wrds n the left with their ppsites n the right.
A. safe E. unusualB. bttm F. livingC. suthern G. highD. abve H. die
____ 1.belw ____ 2.cmmn____ 3.lw ____ 4.dead____ 5.tp ____ 6.nrthern____ 7.risky ____ 8.survive
Read the examples and make mre sentences using hw and the wrds in the bx.
Hw far is it frm yur hme t schl?  Hw heavy is a blue whale?Hw large is yur cuntry? Hw ften d yu exercise?
1 .  2 .  3 .  4 .  5 .  6 . 
lng high deep ld fast sn
Hw lng is the Yellw River?
Hw high is Munt Taishan in Shandng?
Hw ld is yur grandfather?
Hw fast can a giraffe run?
Hw sn will the rainy seasn start in this area? 
Hw deep is the Mariana Trench?
Cmplete the passage with the crrect frms f the wrds in the bx.
deep survive wnderful surface dive
Lcated in Siberia, Russia, Lake Baikal is ne f the wrld’s mst famus lakes. It is the________ freshwater lake in the wrld. T reach the bttm, yu must_______ 1,620 metres! It is als larger than mst ther lakes. Its_________ cvers 31,500 square kilmetres. That is bigger than the cuntry f Belgium! Lake Baikal is cld mst f the year. But ver 1,200 different types f animals can still ________ in this envirnment. Tday, the lake still attracts many curius travellers. After all, it is a great natural_________!
自然的；天然的；天生的
What’s the vide abut?
Read the advertisement. Circle the numbers and underline the adjectives used t describe the Great Barrier Reef.
D yu lve the cean? D yu want t visit ne f the natural wnders f the wrld? If s, visit the Great Barrier Reef!Lcated n the nrtheastern cast f Australia, the Great Barrier Reef is ne f the mst amazing places t visit. It is the biggest cral reef in the wrld. It takes up an area f 345,000 square kilmetres and includes many islands and white sand beaches.The Great Barrier Reef is als alive! If yu visit it, yu will see the largest living structure n earth. Here, yu can swim r dive in the clear water and see cral, plants, and clurful fish. If yu dive deeper, yu might even see large fish, turtles, and sharks. Fr peple wh lve the cean, visiting the Great Barrier Reef is the dream f a lifetime!
if s 如果是这样的话；要是这样 是“if it is s”的省略形式，表示肯定意义；如果表示否定意义，则用if nt。
占用（时间）；占据（空间)
persuasive(可信的) and impactful (有冲击力的)
mre vivid(生动的) and mre attractive
Read the text again and fill in the key infrmatin.
n the nrtheastern cast f Australia
the Great Barrier Reef
1. the biggest cral reef →an area f 345,000 km22. alive→the largest living structure n earth
1. swim r dive in the clear water2. see cral, plants, and clurful fish; dive deeper→even see large fish, turtles & sharks
What des an advertisement fr natural wnders cnsist f?
文章结构开头：用问句吸引读者，点明推荐地点。主体介绍位置、核心特点（面积、规模、生物多样性）推荐可做的事（swim, dive, see...）结尾：情感号召，强化吸引力。
Read a student’s ntes n Qinghai Lake. Rewrite them in full sentences.
Qinghai Lake What: a salt lake Where: Qinghai Prvince, China Special fact: the largest lake in China (4,340 km²) Things t d: phtgraph wildlife (fish and birds), visit islands, ride a bike r hrse
Qinghai  Prvince, China
the largest lake
4, 340 square kilmetres
phtgraph wildlife (fish and birds), visit islands, ride a bike r hrse
Write an advertisement(广告) fr Qinghai Lake r anther natural wnder. Try t make yur advertisement as persuasive(有说服力的) as pssible.
advertisementTitle: Place Name: A/An adj Wnder f : D yu want t If s, visit...!BdyLcated in..., it is the largest... It cvers an area can see... Yu can : Visiting... is the dream f a lifetime!
Write an advertisement fr Qinghai Lake r anther natural wnder. Try t make yur advertisement as persuasive as pssible.
Lking fr an amazing summer trip? Cme t Qinghai Lake in Qinghai Prvince—China’s largest salt lake, cvering 4,340 square kilmetres!Lcated at abut 3,200 metres abve sea level, it’s much higher than any lake yu’ve ever seen.The lake’s water is the clearest and bluest yu’ll ever see. It’s mre beautiful than a thusand painted pictures.Here, yu can get clse t amazing wildlife. There are hundreds f different kinds f fishes swimming in the lake and thusands f clurful birds flying abve. Yu’ll have the best chance t take amazing phts.Fr utdr fun, yu can ride bikes r hrses alng the lake. It’s a lnger and mre exciting ride than anywhere else nearby.This is the best place t relax and have fun. Dn’t miss it—Qinghai Lake is waiting fr yu!
( )1. --- is yur cuntry? --- It is abut 9.6 millin square kilmetres. A. Hw lng B. Hw large C. Hw deep D. Hw high( )2. The city is building a new airprt in its area t imprve transprtatin. A. nrtheastern B. nrth C. nrtheast D. east( )3. Little Tm is always the stars at night, he ften asks his dad why they shine s bright. A. curius abut B. afraid f C. gd at D. tired f( )4. After the fire was put ut, the firefighters were happy t find that the little dg was still . A. live B. alive C. lively D. living( )5. Our schl sprts meeting has many interesting activities， running, jumping and ball games. A. include B. including C. included D. includes
The cean is a very big and wnderful place. Its 1. is full f life. Yu can see many clurful fish swimming there, and sme small plants flat n the water. The sun shines brightly, making the surface warm and light. But if yu g 2. int the cean, things change a lt. It grws dark because the sun can't reach there, and the water becmes very cld, Even s, sme special animals can 3. in this harsh envirment. They have unique ways t live — like being able t find fd in the dark. The cean is an imprtant part f ur 4. . It helps keep the air clean and gives hmes t millins f creatures. Frm the bright surface t the dark deep, there's life everywhere. It's amazing t think abut hw all these animals survive in such different cnditins!
surface deep envirnment survive
While-writing
范畴: 人与自然主题群: 自然生态子主题内容: 不同地区的生态特征与自然景观
本单元的话题是“自然奇观”，与此相关的写作一般是描述某个奇特的自然景观。写作时，可以先谈这个景观的位置，然后描写该景观的主要特点，最后表达对该景观的感受。
中国西藏的雅鲁藏布大峡谷（The Yarlung Zangb Grand Canyn）不仅是世界上最长的峡谷，还是世界上最深的峡谷。请你根据下列内容提示，写一篇80词左右的英语短文，简要介绍一下雅鲁藏布大峡谷。
文体: ________________ 人称: ________________ 时态: ________________
要点：1. 介绍地理情况2. 描述其生态地位3. 说明最佳游览季节
The Yarlung Zangb Grand Canyn is ne f the greatest natural wnders, lcated in Xizang, China. The Yarlung Zangb Grand Canyn is nt nly the wrld’s lngest but als the wrld’s deepest canyn.It is 504.6 kilmetres lng, abut 57 kilmetres lnger than the Grand Canyn in the US. Its maximum depth reaches 6,009 metres. The Yarlung Zangb Grand Canyn is hme t s many plants and animals that it’s called the “plant museum” and the “animal kingdm”. The best time t visit the Yarlung Zangb Grand Canyn is in spring and summer. Fr peple wh lve the canyn, visiting the Yarlung Zangb Grand Canyn is the dream f a lifetime!
用“ne f the+形容词最高级+可数名词复数”表明雅鲁藏布大峡谷“世界级自然奇观”的属性
用“nt nly... but als...”介绍雅鲁藏布大峡谷的地理情况
用“s... That”描述雅鲁藏布大峡谷的生态地位
用wh 引导的定语从句及动名词短语作主语表明雅鲁藏布大峡谷对于峡谷爱好者的意义
阅读关于黄山的笔记，为黄山撰写一则广告。 (1)What：一座拥有独特景致的世界闻名的山脉；(2)Where：中国安徽省； (3)Special fact：以奇松，怪石，云海著称；(4)Things t d：登山赏景，游览古寺(ancient temples)，拍摄美丽的自然风光(natural landscapes).要求： 1. 描述黄山并阐释人们为何应去此地游览； 2. 尽量让你的广告具有说服力； 3. 字数在60~80; 4. 开头已给出，不算入总字数。
D yu want t visit ne f the natural wnders f Anhui? If s, visit the Munt Huang.
Lcated in Anhui Prvince, China, it's a wrld-famus muntain with unique and beautiful scenery. It's famus fr its strange pines, grtesque rcks, and the magnificent sea f cluds. When yu're there, yu can climb the muntain t enjy the beautiful views, visit ancient temples, and take lts f phts f the wnderful natural landscapes.Fr peple wh lve muntains, yu're sure t have an unfrgettable time at Munt Huang!
Listen and read the text in 3a.Chse ne natural wnder yu’re interested in and cllect infrmatin nline. Then, write an article t intrduce it.
What natural wnders are they? What special facts d yu knw abut these natural wnders? Chse ne and share with us.
the Yellw River
the Yangtze River
the Sahara Desert
the Mariana Trench
Design a pster abut a natural wnder
Wrk in a grup. Chse a natural wnder (a river, lake, muntain, frest, waterfall, etc.). Then d sme research and make ntes.小组合作。选择一处自然奇观（河流、湖泊、山脉、森林、瀑布等）。然后进行调研并做笔记。
namelcatin and sizeplants and animalsspecial facts
Make a pster abut the natural wnder yu chse. Refer t the example n the right.
What infrmatin can yu get frm the title and the pictures?
种类 a variety f 各种各样的
Read and answer the questins.
What’s the natural wnder?
What size is it?
What’s its lcatin(位置)?
Amazn Rainfrest.
In Brazil, Peru, Clmbia, and five ther cuntries.
It’s 6 millin square kilmetres in size.
What special facts d yu knw abut it?
It’s wrld’s biggest rainfrest.It’s called “the lungs f the earth”.It’s the largest variety f plants and animals in the wrld.
Sample pster
Huanggushu Waterfallthe largest waterfall in Chinalcated in Guizhu Prvince101 metres wide and 77.8 metres highraring（咆哮的）water rushes dwn every secndpeple can walk right behind the waterfall thrugh a natural cave
As a grup, give a reprt t the class. Pay attentin t the use f large numbers, cmparatives, and superlatives.
The Amazn Rainfrest is thewrld’s biggest rainfrest.It cvers 6 millin squarekilmetres. Yu can see mst fit in three cuntries, Brazil, Peru,and Clmbia …
Gd mrning, class! Tday we’d like t intrduce yu t Huanggushu Waterfall — the largest waterfall in China.Lcated in Guizhu Prvince, Huanggushu Waterfall is 101 metres wide and 77.8 metres high. The main waterfall alne is much wider than many small waterfalls nearby! Every secnd, raring water rushes dwn—it’s like a huge white curtain falling frm the sky.What makes Huanggushu Waterfall even mre special is that yu can walk right behind the waterfall thrugh a natural cave. This gives travellers a much mre exciting experience than watching frm a distance. Huanggushu Waterfall attracts millins f curius travellers each year.If yu want t experience the greatest pwer f nature, Huanggushu Waterfall is the best place t visit! Thank yu fr listening!
1. What new facts abut natural wnders have yu learnt?2. Can yu make cmparisns when talking abut natural wnders?3.Can yu use large numbers t give sme gegraphy facts?4.Can yu explain hw and why peple cnnect with nature?5. What are sme achievements that peple have made while explring nature?
Nature makes us wnder. That is why it is wnderful.
What d yu knw abut the Sahara Desert?
The Sahara Desert
Lcated in Africa, the Sahara Desert spreads acrss 30 per cent f the cntinent. This vast desert, als knwn as “the great desert” in Arabic, is abut 9 millin square kilmetres in size. It is als at least 4.6 millin years ld. This means that it is ne f the ldest places in the wrld.All deserts are dry, and the Sahara is bth dry and ht. It is the largest ht desert in the wrld. We may think that all deserts are ht, but in fact sme deserts are very cld! Many scientists believe that Antarctica, fr example, is a type f cld desert.Mst f the Sahara is rcky grund. But there are als places with grass, lakes, muntains, and even sand seas. A sand sea is just what it sunds like—it lks like a sea f sand! When the wind blws, the sand lks like waves.
what引导的表语从句，说明沙海是什么样的
Life in the Sahara is difficult. Abut tw millin peple live in the Sahara. They usually mve frm place t place. There is water in a few parts f the Sahara, and sme peple live in these places all year rund.Nt many animals can live in a place with such a dry and ht climate. They must adapt t survive. Camels, fr example, g fr a lng time withut drinking water. When they d find water, they can drink mre than 100 litres f it in 13 minutes! Fennec fxes live in the desert t. They have large ears t help their bdies stay cl.Tday, the wrld’s largest ht desert is getting even bigger. It is nw abut 10 per cent larger than what it was abut a century ag. But why is it grwing? Sme scientists believe that part f the reasn is climate change. As temperatures rise, summers in Africa grw htter and less rain falls. Water bdies get smaller and the grund gets drier and drier. If we d nt take effective measures, the desert will keep grwing!
到处；从一个地方到另一个地方
不定式作目的状语，说明大耳朵的作用
适应（新情况） adapt t 适应某物
此处的d是强调助动词，当句中无其他助动词时，用于加强语气
比较级+and+比较级 越来越……
Read the text and cmplete the mind map.
abut 9 millinsquare kilmetres
at least 4.6 millinyears ld
mst places are rcky; sme have grass, lakes，muntains and even sand seas
abut 10 per cent larger than what it was abut a century ag
1. Hw is life in the desert different frm ther places where peple live?
2. Wuld yu like t visit the Sahara Desert r even live there fr a while? Why r Why nt?
3. What d yu think will happen if the Sahara keeps getting bigger? What shuld we d abut it?
Life in the desert is much harder. First f all, it is hard t find water, and peple usually mve frm place t place. What’s mre, the weather in the desert is very dry and ht. In ther places, peple usually have stable hmes and enugh water. The weather is better than that in the desert.
I wuld like t visit the Sahara Desert. Because I want t see its amazing landscapes, like sand seas and the rcky grund. / I dn’t want t live there. Because it’s t ht and difficult t find water.
If the Sahara keeps getting bigger, I think mre land will dry up, and peple and animals there may lse their hmes. We shuld take effective measures, such as reducing pllutin, planting mre trees, and saving water.（答案不唯一，仅供参考）
Review the wrds and phrases in this unit.Plish yur pster and write an article t intrduce the natural wnder yu’re interested in.