高中英语外研版 (2019)选择性必修 第二册Unit 5 A delicate world教案配套ppt课件

这是一份高中英语外研版 (2019)选择性必修 第二册Unit 5 A delicate world教案配套ppt课件，共21页。PPT课件主要包含了absorb，rely on，fed on，prey on，break down，release，完成课后相关练习等内容，欢迎下载使用。
Lk at the sentences and answer the questins. Sentences (a) and (c) are frm the reading passage.
1 What des “it” refer t in sentences (a) and (c)?
“It”, in sentence (a) refers t“the island is a UNESCO Wrld Heritage Site”“It” in sentence (c) refers t “t cme up with a plan t remve all the rabbits frm the island”.
2 What is the difference between the sentences in each grup?
When the biect f a sentence is a that-clause (b) r an infinitive (d), we smetimes use “it” as an empty bject and put the real bject later t keep balance. Fr example, sentence (a) uses “it” as the empty bject f “think”, referring t the real bject: “the island is a UNESCO Wrld Heritage Site”. Sentence (b) uses that-clause as the bject f “think”.
Nw lk fr mre sentences with this structure in the reading passage, and summarise its use in yur wn wrds.
Rewrite the underlined parts using it as an empty bject.
The red-eared slider, a species f freshwater turtle, is native t the Suthern United States and Nrthern Mexic. Due t its cute appearance, many peple think keeping this turtle as a pet is a gd idea. Recent years have seen mre and mre pet sliders escaping r being released frm hmes, and sme wners believe t release them int the wild is n big issue. These days, peple have fund t release these turtles int the wild is a threat t ther species. Experts cnsider wners keeping their pets in an enclsed area imprtant, and anyne unable t keep their pets shuld take them t an apprpriate animal shelter.
many peple think keeping this turtle as a pet is a gd idea
many peple think it a gd idea t keep this turtle as a pet
believe t release them int the wild is n big issue
believe it n big issue t release them int the wild
peple have fund t release these turtles int the wild is a threat t ther species
peple have fund it a threat t ther species t release these turtles int the wild
Experts cnsider wners keeping their pets in an enclsed area imprtant
Experts cnsider it imprtant fr wners t keep their pets in an enclsed area
Lk at the pictures f the Saihanba Natinal Frest Park and describe its changes using it as an empty bject where apprpriate. Yu may refer t the wrds and expressins in the table fr help.
I think it a breakthrugh t transfrm a desert int a frest...
Describe hw a place yu knw has changed using it as an empty bject where apprpriate.
Lk at the diagram and answer the questins. Pay attentin t the wrds and expressins in bld.
1 What des the diagram shw? 2 What are the relatinships between the living things?
The diagram shws a fdchain - the cnnectin between the living things.
The living things are clsely cnnected with each ther by the fd they eat. Secndary cnsumers prey n primary cnsumers, primary cnsumers feed n prducers, and prducers absrb light frm the sun, and water and disslved nutrients frm the sil, which are prvided by decmpsers.
Cmplete the passage with the crrect frm f the wrds and expressins in Activity 5.
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.
pesticides and climate changes
declining very quickly
have fallen by 17%
Nw talk abut the imprtance f bees.
be unable t reprduce
Other insects
bees are respnsible fr pllinating abut 70 %
wuld die ut
Cmplete the bxes with the expressins frm the cnversatin.
Yu must be kidding!I dn't believe it!Are yu sure abut ... ?
It’s a fact!Dn't frget it ut fr t statistics...
Wrk in pairs. 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.