英语选择性必修 第二册Unit 5 A delicate world集体备课ppt课件

这是一份英语选择性必修 第二册Unit 5 A delicate world集体备课ppt课件，共33页。PPT课件主要包含了内容索引，核心考点 课堂突破，随堂巩固 迁移运用，for　，multiplied，multiplies，explosion，comparison，on　，endangered等内容，欢迎下载使用。
1.appetite n.胃口,食欲[教材原句]Unfrtunately,the cats subsequently develped an appetite fr the birds,t.(P50)不幸的是,这些猫随后喜欢上了吃鸟。语境巧练[单句语法填空](1)The lng walk has given me 　　　　　gd appetite. (2)The public has an insatiable appetite 　　　　　stries abut the famus. [小话题写作](3)玛丽不喜欢做艰苦的工作。Mary 　　　　　　　　　　　　　　　　hard wrk. 
desn’t have an appetite fr
考点必记have an appetite fr sth喜欢/想做某事lse ne’s appetite没有食欲appetizer n.开胃品appetizing adj.促进食欲的,开胃的[名师点津]appetite的基本意思是“欲望”,指人或动物对食物等的欲望;用于比喻时,可指“斗志”等。appetite既可用作可数名词,也可用作不可数名词,有复数形式。
2.multiply v.(使)大大增加,(使)倍增[教材原句]Lse n the island,they did what rabbits d best—they multiplied rapidly and began eating the native vegetatin and digging hles,which caused sil ersin.(P50)在岛上无拘无束,它们开始做兔子最擅长的事情——它们数量快速增加,开始吃当地的植物,并打洞,造成了土壤侵蚀。
语境巧练[单句语法填空](1)2 　　　　　(multiply) by 4 makes 8. (2)Cigarette smking 　　　　　(multiply) the risk f cancer. (3)It is pssible 　　　　　(multiply) these bacteria in the labratry. [完成句子](4)自去年以来,我们的问题成倍增加。　　　 　　　　　　　　　　　　　　　since last year. 
t multiply　
Our prblems have multiplied
考点必记multiply A by B |multiply A and B (tgether) A乘以Bmultiplicity n.多种多样,多样性multiple adj.数量多的,多种多样的[名师点津]1.multiply的基本意思是“增加”,主要指通过自然繁殖而增加数量,也指同类事物在数量上无限制的重复增加。用于数学,可表示“相乘”。2.multiply既可用作及物动词,也可用作不及物动词。
3.decrease v.(使)变小,(使)减少　n.减少[教材原句]But althugh the virus caused the rabbit ppulatin t decrease frm 130,000 t arund 10,000,it als meant less fd fr the cats.(P51)但是虽然病毒使得兔子数量从13万降到了大约1万,但是这也意味着猫的食物减少了。
语境巧练[单句语法填空](1)They are making every effrt 　　　　　(decrease) the prductin cst. (2)Is yur prductin 　　　　　the decrease? (3)There has been 　　　　　decrease in ur imprts this year. [小话题写作](4)今年新学生的数目从3 500减少到了2 500。This year the number f new students 　　　 　　　　　　　　. 
decreased frm 3,500 t 2,500
考点必记n the decrease在减少There is a decrease in...……有所减少[反义词]increase v./n.增加[名师点津]decrease与lessen,reduce的含义均是“减少,变少”。 decrease指逐渐地、不断地减少;lessen指数目、程度、价值、实力等的减少。 reduce是普通用词,含义广。指数量、程度的降低或减少。
4.trap n.夹子,陷阱[教材原句]In the 1980s,traps and dgs were used t catch the cats.(P51)在20世纪80年代,陷阱和狗被用来捉猫。
语境巧练[单句语法填空](1)Li Hua has fund it was caught in 　　　　　trap f his wn making. (2)If yu 　　　　　(trap) smewhere,smething falls nt yu r blcks yur way and prevents yu frm mving r escaping. [小话题写作](3)我中计了,承认自己撒谎。I 　　　　　　　　　　　　　　　that I had lied. 
are trapped
was trapped int admitting
考点必记set a trap fr为……设下圈套trap sb int ding sth诱骗某人做某事[名师点津]trap作名词“夹子,陷阱”讲时是可数名词;作动词时,意为“拦住,设陷阱捕捉;诱捕”。
5.explde v.突然增加[教材原句]It turned ut that they develped an immunity t the virus,and their numbers explded nce again.(P51)结果它们对这种病毒产生了免疫,它们的数目再次猛增语境巧练[单句语法填空](1)T my surprise,the ppulatin f the wild animals 　　 　　　(explde) since tw years ag. (2)The 　　　　　(explde) f the chemical plant has pisned many lcal residents. 
has explded
[小话题写作](3)活火山随时都有可能爆发。An active vlcan 　　　　　　　　　　　　　　　　　　　　　. 考点必记explde with anger勃然大怒explsin n.爆炸(声)[名师点津](1)explde的基本含义是“爆炸”,主要指炸弹、油箱、锅炉等的内部能量突然释放;引申为“迅速扩大,激增”。也可用来指人“勃然大怒”“破除”等。作“破除”讲时,其宾语多为理论、信念等抽象名词。(2)explde既可作及物动词,也可作不及物动词。
may explde at any time
6.we v.应该做;对……负有……的义务[教材原句]This interventin is a lng,much-delayed ending t a sad stry,but we humans we it t the island t give it a happy ending.(P51)这种干预需要耽搁很久才能结束这个悲剧故事,但是我们人类有责任给这个岛屿一个美好的结局。
语境巧练[单句语法填空](1)If I have imprved in any way,I we it all 　　　　　yu. (2)We we 　　　　　t sciety t make ur cuntry a better place. [小话题写作](3)为这部车我们还欠着100美元。We still 　　　　　　　　　　　　　　　　　　　　fr the car. [翻译句子](4)我应向他道歉。
we ne hundred dllars　
I we him an aplgy.
考点必记we it all t sb一切都归功于某人we sth t sb把某事归功于某人we sb an aplgy该向某人道歉we it t sb t d sth做某事是某人的责任we sb fr sth因为某事欠某人钱[名师点津]we表示“欠某人债,应该向(某人)付出”,引申为“某人对他人、国家负有感激义务等或某人把发现、原理、成就等归于他人”。we用作及物动词,其后接名词或代词作宾语,也可接双宾语。
7.cmparisn n.比较[教材原句]Data,examples and cmparisns are then used t supprt the main ideas.(P56)然后,数据、例子和比较被用来支持中心思想。语境巧练[单句语法填空](1)My nephew is rather dull in 　　　　　(cmpare) with thers. (2)We can nly tell gd frm bad 　　　　　cmparisn. 
[句式升级](3)We are living a happy life,in cmparisn with the peple living in the 1960s.(升级为过去分词短语作状语)→　　　　　 　　　　　the peple living in the 1960s,we are living a happy life. 
Cmpared with/t
考点必记in cmparisn with和……相比by cmparisn通过对比cmpare v.比较,与……类似cmpare A with B把A和B进行比较cmpare A t B把A比作Bcmpared with/t与……相比
8.n behalf f 代表[教材原句]It is my great pleasure t give a lecture here n behalf f the Be at One with Nature Assciatin.(P56)我很高兴代表“天人合一组织”发言。语境巧练[单句语法填空](1)He spke 　　　　　behalf f all the members f the faculty and staff. (2)He accepted the invitatin n behalf 　　　　　the whle class. [小话题写作] (3)我将代表全体毕业生讲话.I’ll make a speech　 　　　　　　　　　.
n behalf f all the graduates
考点必记n behalf f sb=n sb’s behalf做某人的代表in behalf f sb=in sb’s behalf做某人的代表或代言人represent作动词,意为“代表”。[写作佳句]On behalf f the students in my class,I express ur gratitude t yu fr all yu have dne fr us.我代表我们班的同学,感谢您为我们所做的一切。
9.endangered adj.濒临灭绝的[教材原句]Althugh endangered elsewhere in China due t the invasin f freign species,the bees f Shennngjia have cexisted with the lcal peple fr centuries.(P57)虽然由于外来物种的入侵,这种蜜蜂在中国其他地区濒临灭绝,但是神农架的蜜蜂却与当地人共处了数个世纪。
语境巧练[单句语法填空](1)Many f the earth’s animals have already died ut; and several ther species 　　　　　(endanger). (2)Icy rads are a hidden 　　　　　(endanger) t mtrists. (3)It was a 　　　　　(danger) climb,but they braved it ut. [小话题写作](4)我们应该竭尽全力挽救濒临灭绝的物种。We shuld try ur best 　　　　　　　　　　　　　　　　　　　　. 
t save endangered species
考点必记danger n.危险endanger v.使面临危险,危害dangerus adj.危险的in danger处于危险之中[名师点津]endangered作“濒临灭绝的”讲时,在句中作宾语、表语和补足语等。
Ⅰ.单句语法填空1.The prblems grew,　　　　　(multiply),and cmplicated beynd all reasn. 2.He did nt want t knw what rumurs yu had heard abut him 　　 　　　(subsequent). 3.He spent a lt f mney in satisfying the appetite 　　　　　excitement and amusement. 4.He was examined again and then was given a different 　　　　　(herb) medicine. 
subsequently
5.Many measures have been taken t save 　　　　　(endanger) wildlife in China. 6.Oil prices fell this week t their lwest level in furteen mnths,　　　　　(apparent) because f ver-prductin. 7.The lift brke dwn and we were 　　　　　(trap) inside it. 8.Mney was plentiful,and 　　　　　(rare) did anyne seem very bthered abut levels f expenditure. 9.We’ve gt stable labr,　　　　　(decrease) interest rates,and lw il prices. 
endangered　
apparently　
10.Oats prvide gd,　　　　　(nutrient) fd fr hrses. 11.The rigin f this natin is wrapped in prfund 　　　　　(mysterius). 12.Fr wmen,the “　　　　　(bilgy) clck” gverns the time fr having children. 13.There is n 　　　　　(cmpare) between the knwledge and skill f such a player and the rdinary casual participant. 14.This plicy has led t a 　　　　　(dramatically) increase in ppulatin. 15.He 　　　　　(greet) by his mther,her red hair wildly streaming. 
was greeted
Ⅱ.选词填空1.In abslute terms,wages have risen,but nt 　　 　　　the cst f living. 2.He said salmn exprts had been fuelled by a grwing Chinese middle class wh 　　 　　　the fish. 3.But we have managed 　　　 　　ur ppsitin fr years. 4.　　　　　　　 all the students here I want t thank yu fr yur help. 5.A lcal newspaper said that crime was 　　　　　　　. 
n behalf f,cexist with,in cmparisn with,n the decrease,have an appetite fr
in cmparisn with
had an appetite fr
t cexist with
On behalf f　
n the decrease