本課時(shí)涉及的是語言知識(shí)運(yùn)用，包括 It as an empty bject和 Ecsystems兩部分。It as an empty bject講解it作形式賓語的句型和基本用法，要學(xué)會(huì)分析句子結(jié)構(gòu)，選用正確的賓語形式。Ecsystems首先以思維導(dǎo)圖的形式列出了食物鏈，分別說明了食物鏈中的生產(chǎn)者、初級(jí)消費(fèi)者、次級(jí)消費(fèi)者以及分解者在食物鏈中所處的地位和作用；然后以聽力練習(xí)的形式介紹了蜜蜂數(shù)量的減少對(duì)于整個(gè)生態(tài)系統(tǒng)的潛在影響。
課時(shí)目標(biāo)
1.掌握本課時(shí)的重點(diǎn)單詞 disslve、nutrient、wrm和短語 be native t、due t、rely n、feed n、prey n、breakdwn、take in、be in existence、depend n、be respnsible fr、cntribute t的用法，并能在真實(shí)語境中靈活運(yùn)用。
2.掌握it作形式賓語的用法。
3.引導(dǎo)學(xué)生關(guān)注話題的語用功能，學(xué)會(huì)表達(dá)質(zhì)疑和回應(yīng)別人的質(zhì)疑。
4.了解食物鏈中生物的相互制約、相互依存，共生共榮及生態(tài)平衡的重要性。人類可以通過自己的努力保護(hù)各個(gè)生態(tài)系統(tǒng)，促進(jìn)生態(tài)平衡；人類也能夠?yàn)榱俗陨淼难矍袄媛訆Z資源，破壞生態(tài)平衡。人類不能超自然而存在，保護(hù)生態(tài)平衡也是保護(hù)人類自己，一旦生態(tài)平衡遭到破壞，危及整個(gè)生物圈，人類自身也在劫難逃。
重點(diǎn)難點(diǎn)：
重點(diǎn)：
it作形式賓語的用法。
難點(diǎn)：
1.it作形式賓語的用法。
2.食物鏈?zhǔn)顾械纳锉３种耙晃镏我晃铩钡臓顟B(tài)，只要沒有外界的破壞，食物鏈就永遠(yuǎn)不會(huì)斷，生態(tài)因食物鏈的存在而得到平衡。
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)備好有關(guān)生態(tài)平衡和食物鏈的材料。
學(xué)生準(zhǔn)備：
1.簡述一個(gè)比較常見的食物鏈并分析各種生物相互依存、相互影響的關(guān)系。
2.上網(wǎng)查找it作形式賓語的用法，學(xué)會(huì)分析句子結(jié)構(gòu)，選用正確的賓語形式。
3.預(yù)習(xí)課本P53~55的內(nèi)容，我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
1.D Activity 1 n Page 53.
(1) Lk at the sentences and answer the questins.
Sentences(a) and(c) are frm the reading passage.
·What des "it" refer t in sentences (a) and (c)?
·What is the difference between the sentences in each grup?
（2）Give enugh examples f the usages f it as an empty bject. And instruct students t sum up the usages f it as an empty bject. Then ask students t give example.
【設(shè)計(jì)意圖】從前面的閱讀文章中選取學(xué)生熟悉的句子并總結(jié)it作形式賓語的用法，旨在引導(dǎo)學(xué)生初步感知并了解it作形式賓語的用法。
2.D Activity 2 n Page 53.
Rewrite the underlined parts using it as an empty bject.
【設(shè)計(jì)意圖】通過改寫句子活動(dòng)，引導(dǎo)學(xué)生找出句子的真正賓語，了解it作形式賓語的用法和作用，并學(xué)會(huì)在具體語境中靈活運(yùn)用。
3. D Activity 3 n Page 53.
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.
【設(shè)計(jì)意圖】通過看圖描述圖片，并根據(jù)給出的語言提示，學(xué)會(huì)運(yùn)用it作形式賓語的句型，讓學(xué)生進(jìn)一步體會(huì)該語法在表達(dá)中的運(yùn)用，掌握it作形式賓語的用法。
4.D Activity 4 n Page 53.
Describe hw a place yu knw has changed using it as an empty bject where apprpriate.
【設(shè)計(jì)意圖】通過描述自己熟悉的某個(gè)地方在生態(tài)方面發(fā)生的變化，學(xué)會(huì)運(yùn)用it作形式賓語的句型，進(jìn)行語言練習(xí)，引導(dǎo)學(xué)生自己組織語言，加大了練習(xí)的難度，進(jìn)一步鍛煉學(xué)生運(yùn)用語言的能力。
【備注】語法知識(shí)點(diǎn)講解詳見第二教案“重點(diǎn)語法精講”部分。
Step Ⅱ Ecsystems
1. D Activity 5 n Page 54.
Lk at the diagram and answer the questins. Pay attentin t the wrds and expressins in bld.
·What des the diagram shw?
·What are the relatinships between the living things?
(2) D Activity 6 n Page 54
Cmplete the passage with the crrect frm f the wrds and expressins in Activity 5.
【設(shè)計(jì)意圖】通過閱讀，了解整個(gè)生態(tài)系統(tǒng)的食物鏈中不同物種的位置和作用，并將黑體詞的適當(dāng)形式填入適當(dāng)?shù)奈恢?，提高學(xué)生分析問題、解決問題的能力，實(shí)現(xiàn)知識(shí)的遷移。
Step Ⅲ Listen and d exercises
1. D Activity 7 n Page 55.
(1) Ask students t read "Did Yu Knw? "and make sure students understand its meaning.
(2) Listen t the cnversatin and chse the true statements.
①Bees are very imprtant t ur fd supply because they prvide hney.
②The bee ppulatin is declining.
③Withut bees, humans wuld die ut.
④All human crps depend n bees fr pllinatin.
⑤If bees became extinct, ther insects culd pllinate enugh crps.
⑥Humans are respnsible fr the decline in the bee ppulatin.
2. D Activity 8 n Page 55.
Listen again and cmplete the flw chart.
3. D Activity 9 n Page 55.
Cmpete the bxes with the expressins frm the cnversatin.
Expressing dubt
Respnding t dubt
4.D Activity 10 n Page 55
Talk abut what wuld happen t the ecsystem if anther species died ut.Use the wrds and expressins in this sectin.
【設(shè)計(jì)意圖】該部分設(shè)置了四個(gè)相應(yīng)的練習(xí)題，聽錄音，選擇正確的表述；再聽錄音，完成流程圖，難度有所增加；用所給的表達(dá)完成表格；討論如果一個(gè)物種滅絕會(huì)對(duì)生態(tài)系統(tǒng)產(chǎn)生什么樣的影響，在語言輸入的基礎(chǔ)上進(jìn)行語言輸出，讓學(xué)生學(xué)會(huì)表述，提高語言運(yùn)用能力。
Step IV Summing up
總結(jié)it作形式賓語的句型和用法，并注意該部分新學(xué)詞匯的運(yùn)用。
【備注】語法知識(shí)點(diǎn)講解詳見第二教案“重點(diǎn)語法精講”。
Step V Hmewrk
1. Give students sme examples t fill in the blanks with it as an empty bject.
2. Master the usages f the new vcabulary.
板書設(shè)計(jì)：
a N visitr wuld think it surprising that the island is a UNESCO Wrld Heritage Site.
b N visitr wuld think that the island being a UNESCO Wrld Heritage Site is surprising.
c Experts felt it necessary t cme up with a plan t remve all the rabbits frm the island.
d Experts felt t cme up with a plan t remve all the rabbits frm the island was necessary.
Suggested answers：
·"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".
·When the bject 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".
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.
Suggested answers：
·many peple think it a gd idea t keep this turtle as a pet
·believe it n big issue t release them int the wild
·peple have fund it a threat t ther species t release these turtles int the wild
·Experts cnsider it imprtant fr wners t keep their pets in an enclsed area
nuns/adjectives
t d/that
breakthrugh
impssible
likely
unrealistic
---
grw
investigate
plant trees
transfrm
---
Suggested answers：
·The diagram shws a fd chain-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.
In a wdland ecsystem, trees and ther plants are prducers. They①__________
water, and take in nutrients frm the sil and energy frm the sun. Insects are an example
f a primary cnsumer. They②____________he prducers t prvide fd fr them, and are③____________by secndary cnsumers: small mammals and birds. They④___________the primary cnsumers. Wrms, fungi and bacteria are decmpsers. They
⑤____________animal waste and the remains f living things. The chemicals these decmpsers⑥__________fertilise the sil and give the plants the nutrients they need t grw.
Suggested answers：
①absrb ②rely n ③fed n ④prey n
⑤break dwn ⑥r(nóng)elease
·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.
Suggested answers：
②③⑥
A cmbinatin f things damages bee habitats, mainly①______________.
The bee ppulatin is②____________.Accrding t statistics bee numbers in the US ③___________in just ne year.
Withut bees, crps wuld ④______________.
⑤______________wuld nt be able t cmpensate fr the lss f bees, because⑥______________f the species f crps.
Animals that live n the crps⑦_(dá)____________.
Humans have nthing t eat and die ut.
Suggested answers:
①Pesticides and climate change
②declining very quickly
③have fallen by17%
④be unable t reprduce
⑤Other insects
⑥bees are respnsible fr pllinating abut 70
⑦wuld die ut
●Yu must be kidding!
●I dn' t believe it!
●It' s a fact!
●Dn't frget that...
● Are yu sure abut…?
●Check it ut fr yurself…
●If Accrding t statistics…
Suggested answers:
?Expressing dubt
Yu must be kidding!
I dn't believe it!
Are yu sure abut…
?Respnding t dubt
It's a fact!
I Dn't frget that…
Check it ut fr yurself…
Accrding t statistics…
Unit 5 A delicate wrld
Perid II Using language
I Grammar
Nn-defining attributive clauses
1. D Activity 1 n Page 53.
(1) Lk at the sentences and answer the questins.
(2) Give enugh examples f the usages f it as an empty bject. Guide students t sum up the usages f it as an empty bject.
2. D Activity 2 n Page 53.
Rewrite the underlined parts using it as an empty bject.
3. D activity 3 n Page 53.
Lk at the pictures f the Saihanba Natinal Frest Park and describe its changes using it as an empty bject where apprpriate.
4. D Activity 4 n Page 53.
Describe hw a place yu knw has changed using it as an empty bject where apprpriate.
Ⅱ. Ecsystems
1. D Activity 5 n Page 54.
Lk at the diagram and answer the questins.
2. D Activity 6 n Page 54
Cmplete the passage with the crrect frm f the wrds and expressins in Activity 5.
Ⅲ. Listen and exercises.
1. D Activity 7 n Page 55.
(1) Ask students t read "Did Yu Knw?" and make sure students understand its meaning.
(2) Listen t the cnversatin and chse the true statements.
2. D activity 8 n Page 55.
Listen again and cmplete the flw chart.
3. D Activity 9 n Page 55.
Cmpete the bxes with the expressins frm the cnversatin.
4. D Activity 10 n Page 55.
Talk abut what wuld happen t the ecsystem if anther species died ut.
IV. Summing up
V. Hmewrk

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