英语外研版 (2019)Unit 5 A delicate world背景图ppt课件

这是一份英语外研版 (2019)Unit 5 A delicate world背景图ppt课件，共23页。PPT课件主要包含了die out，main cause等内容，欢迎下载使用。

Unit 5A delicate wrld
Listen t the cnversatin and find ut what the speakers talk abut;Listen and get the detail infrmatin abut what makes bee habitats dangerus;Listen and think hw animals and human beings rely n each ther t live n the earth.
Bees are familiar t us. But d yu really knw abut them?
Yu must hear abut the famus bee dance.
One f the ldest species in the ecsystem, the hney bee has been in existence fr millins f years.A hney bee can fly as fast as 24 kilmetres per hur and its wings can beat 200 times per secnd.In just ne jurney t cllect pllen and nectar, ne single hney bee can pllinate as many as 50 t 100 flwers.
Listening tips
Read the given sentences and guess what yu may listen t in the cnversatin;Underline the key wrds in each sentence and pay attentin t the wrds while listening;Write dwn the wrds in blanks while listening, check yur spelling
Listen t the cnversatin and chse the true statements.
1. Bees are very imprtant t ur fd supply because they prvide hney.2. The bee ppulatin is declining.3. Withut bees, humans wuld die ut.4. All human crps depend n bees fr pllinatin.
5. If bees became extinct, ther insects culd pllinate enugh crps.6. Humans are respnsible fr the decline in the bee ppulatin.
Listen again and cmplete the flw chart.
A cmbinatin f things damages bee habitats, mainly 1__________________________.
The bee ppulatin is 2____________________. Accrding t statistics, bee numbers in the US 3___________________ in just ne year.
pesticides and climate change
declining very quickly
have fallen by 17%
Animals that live n the crps 7____________.
Humans have nthing t eat and die ut.
Withut bees, crps wuld 4____________________________. 5_______________ wuld nt be able t cmpensate fr the lss f bees, because 6_________________________________________ f the species f crps.
be unable t reprduce
Other insects
bees are respnsible fr pllinating abut 70%
wuld die ut
Meg: Hey Ollie, have yu heard that the bee ppulatin is declining?Ollie: N, I haven’t. But, thinking abut it, I hardly ever see bees these days. When I was little, they seemed t be everywhere!Meg: If bees __________, humans will die ut t.Ollie: What? __________________! I dn’t believe it!Meg: It's a fact!! I watched a nature dcumentary all abut it the ther evening. Bees are very imprtant t ur fd supply.Ollie: ______________________? Humans wn't die ut just because there's n hney!
Listen t the cnversatin and fill in the blanks.
Yu must be kidding
Hw can that be pssible
Meg: Bees dn't just make hney. Dn't frget that bees are als respnsible fr _______________. Withut them, crps wuld be unable t reprduce.Ollie: But surely there are ther ways f getting these crps t reprduce. Des it have t be bees?Meg: Well, there are ther insects that pllinate plants, but it's unlikely that they wuld be able t fully cmpensate fr the lss f bees. Bees __________________ pllinating abut 70% f the species f crps.Ollie: _________________________? It sunds rather exaggerated.
pllinating plants
are respnsible fr
Are yu sure abut that data
Meg: Watch the dcumentary and _____________________ if yu dn't believe me. Withut bees, numerus plant species wuld die ut. Animals that live n the crps wuld die ut, and we wuldn't have enugh t eat.Ollie: Seriusly? That's scary! But lking n the bright side, there are millins and millins f bees. They're nt ging t die ut any time sn.Meg: I'm afraid yu're wrng. The bee ppulatin is declining very quickly. ____________________, bee numbers in the US have fallen by 17% in just ne year.Ollie: Gsh! What caused that?
check it ut fr yurself
Accrding t statistics
Meg: A cmbinatin f things, really, but it's mainly due t damage t their habitats caused by pesticides and climate change.Ollie: S human activity is the ____________?Meg: That's right.Ollie: Well, in that case, we'd better d smething befre it's t late.
Cmplete the bxes with the expressins frm the cnversatin.
Yu must be kidding!I dn't believe it!It's a fact!Dn't frget yu sure it ut fr t statistics...
Expressing dubt
Respnding t dubt
Yu must be kidding!I dn't believe it!Are yu sure
It's a fact!Dn't frget it ut fr t statistics...
Talk abut what wuld happen t the ecsystem if anther species died ut. Use the wrds and expressins in this sectin.
Nw think abut hw yur knwledge helped yu cntribute t the discussin.
Nw use the wrds and expressins t shw yur ideas.
On the grassland, wlves eat sheep and hrses, being the enemy f humans and dmestic animals. At the same time, sheep and hrses eat grass. That's a fd chain by which all the animals depend n each ther. That's hw they live tgether in a balanced way fr thusands f years. But humans' hunting t many wlves break the peace and the ecsystem is destryed. Less wlves, mre sheep and hrses and mre buildings fr humans makes smaller grassland and mre desert. Humans taste the evil fruit f their damage f envirnment.