外研版 (2019)选择性必修 第二册Unit 5 A delicate world精品ppt课件

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A delicate world
Unit 5　
Period Two　Starting out & Understanding ideas—Language points
互动探究 探究重点 互动撞击思维
基础自测 自主学习 落实基础知识
达标检测 当堂检测 基础达标演练
内容索引
1. adj.中间的，半途的2. n.栖息地3. n.胃口，食欲4. n.大混乱；紊乱5. n.病毒6. v.(使)减少；(使)变小7. n.夹子，陷阱8. v.倒坍，塌下9. adj.大量的，多的
halfway
habitat
appetite
chaos
virus
decrease
trap
collapse
substantial
重点单词
基 础 自 测
自主学习 落实基础知识
10. n.事件11. v.应该做；对……负有……的义务12. n.生态 → adj.生态的 → n.生态学家13. adv.显著地；戏剧性地 → adj.戏剧性的；突然的 → n.戏剧14. adv.后来，随后 → adj.随后的；后来的
incident
owe
ecology
ecological
ecologist
dramatically
dramatic
drama
subsequently
subsequent
15. v.(使)大大增加，(使)倍增 → adj.多种多样的16. n.保护 → v.保护 → adj.保守的；守旧的17. n.离开 → v.离开；出发18. v.突然增加 → n.爆炸；激增19. n.干预，介入 → v.干预
multiply
multiple
conservation
conserve
conservative
departure
depart
explode
explosion
intervention
intervene
掌握规律　巧记单词名词后缀-(t)ure表示“……的行为或事实” “……的状态” “……的事物”等depart v.离开→departure n.离开fail v.失败→failure n.失败please v.使高兴→pleasure n.高兴expose v.暴露→exposure n.暴露create v.创造→creature n.生物
1. 未能做……2. 接管；控制3. 依次；反过来4. 在数量上5. 原产于……6. 灭绝7. 提出；想出8. 结果，因此9. 一劳永逸10. 把……归功于；欠……
fail to do...
take over
in turn
in number
be native to
die out
come up with
in consequence
once and for all
owe...to...
核心短语
1.v.-ing作结果状语The green grass and bare rock of its landscape contrast dramatically，_______ .青草和裸露的岩石形成了鲜明的对比，赋予它一种野性和自然的美。2.倒装 how its native inhabitants，including royal penguins，king penguins，and elephant seals，existed in perfect harmony with their natural habitat for thousands of years.他们也不会不去想象它的土著居民，包括皇家企鹅、王企鹅和象海豹，数千年来是如何与它们的自然栖息地和谐共存的。
giving it
a wild and natural beauty
Nor would they fail to imagine
经典句式
3.when引导定语从句It’s a tragic story that began in 1810 .这是一个悲剧，始于1810年人类来到岛上。4.with复合结构 ，a virus was released onto the island.有了这个目的后，(人们)在岛上释放了一种病毒。5.it作形式宾语This incident made clear that the rat，mouse and rabbit problem needed solving once and for all.这一事件表明，大鼠、老鼠、兔子问题需要一劳永逸地解决。
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when humans arrived on the island
With this goal in mind
it
Unfortunately，the cats subsequently developed an appetite for the birds，too.不幸的是，猫后来也对鸟产生了食欲。
1
重点词汇
互 动 探 究
探究重点 互动撞击思维
 appetite n.胃口；食欲；渴望have an appetite for喜欢……lose one’s appetite某人没了食欲
(1)If you eat a lot of chocolate before supper，it will spoil your appetite.晚餐前吃很多巧克力会影响你的食欲。(2)He had an enormous appetite arithmetic when he was at school.上学时他极其爱好算术。(3)She has completely since she was infected with the virus.自从感染了病毒以后，她完全没有了食欲。
for
lost her appetite
But although the virus caused the rabbit population to decrease from 130，000 to around 10，000，it also meant less food for the cats.尽管病毒导致兔子数量从13万只减少到1万只左右，但也意味着猫的食物减少了。
2
 decrease v.(使)减少；减小 n.减少※decrease (from sth. ) to sth. (从……)减少到……decrease by sth. 降低了……decrease in sth. 在……方面减少，减小，下降※a decrease in 在……方面的减少on the decrease在减少
(1)The traffic accidents in the city decreased dramatically last year.去年该城市交通事故显著减少了。(2)The number of boarders of the school has decreased three hundred.这个学校的住宿生减少至三百人。(3)As many as 10 of the 17 kinds of penguins may be in danger of disappearing，the number of which has decreased 30% since 1987.17种企鹅中多达10种企鹅可能濒临灭绝，自1987年以来，其数量减少了30%。(4)There is a decrease of nearly 6% the number of visitors to the primeval forest.参观原始森林的人数下降了将近6%。
to
by
in
[句型转换](5)This species of birds is decreasing in number every year.→This species of birds is in number every year.这种鸟的数量每年都在减少。
on the decrease
In the 1980s，traps and dogs were used to catch the cats.20世纪80年代，人们用陷阱和狗来抓猫。
3
 trap n.夹子；陷阱 v.诱捕；诱骗；使陷入困境※set/lay/place a trap for设陷阱捕捉……fall into a trap落入圈套get out of a trap摆脱圈套※trap sb. into doing...诱骗某人做……
(1)He is trying to decide whether the initative was some sort of a trap.他试图判断那次行动是不是个圈套。(2)We set traps in the cafeteria the mice in order to catch them.我们在餐厅里设下夹子想逮老鼠。(3)Some days later，the lion and it tried to get out of it，but in vain.过了几天，狮子掉进一个陷阱中，它用力挣扎，可就是出不来。(4)He felt he had been trapped accepting the compensation terms.他觉得自己是中了圈套才接受补偿条款的。
for
fell into a trap
into
...but we humans owe it to the island to give it a happy ending.……但是我们人类该给这个岛一个幸福的结局。
4
 owe v.应该做；对……负有……的义务※owe sth. to sb. (＝ owe sb. sth. ) 把……归功于某人；欠某人……owe it to sb. to do sth. (为了感谢某人)应该做……，有义务做……owe sb. an apology该向某人道歉※owing to由于
(1)He owes his good health to the specialist’s advice.他把自身的健康归功于这位专家的建议。(2)The comrade has helped you a lot，so you owe it to him (treat) him to dinner.这位同志帮了你很多忙，你该请他吃顿饭。(3)I certainly for not writing more often.没有给您多写信，实在抱歉。(4) ，the tablet fair was cancelled.平板电脑展销会因下雨取消了。
to treat
owe you an apology
Owing to the rain
The green grass and bare rock of its landscape contrast dramatically，giving it a wild and natural beauty.青草和裸露的岩石形成了鲜明的对比，赋予它一种野性和自然的美。
1
※现在分词作结果状语，表示一个自然而然的结果，其逻辑主语往往是前面的句子；如果表示一个出乎意料的结果，常用动词不定式表示。※现在分词作结果状语，有时可以改为一个which引导的非限制性定语从句。
经典句式
(1)The civil war lasted nearly a month，leaving nothing valuable.内战持续了近一个月，几乎没剩下什么有用的东西。(2)He worked hard，only (fail) in the competition.他学习很努力，竞赛却不及格。(3)He was busy with the reconstruction of his house，only (stop) to have a smoke.他正忙着重建房子，只是停下来抽了一口烟。(4)European football is played in 80 countries，_________________________________ in the world.＝European football is played in 80 countries， it the most popular sport in the world.80个国家都踢欧式足球，这使得欧式足球成了世界上最为流行的运动。
to fail
stopping
making it the most popular
sport
which makes
Nor would they fail to imagine how its native inhabitants，including royal penguins，king penguins，and elephant seals，existed in perfect harmony with their natural habitat for thousands of years.他们也不会不去想象它的土著居民，包括皇家企鹅、王企鹅和象海豹，数千年来是如何与它们的自然栖息地和谐共存的。
2
当含有否定意义的词或短语never，hardly，seldom，little，few，not until，not，not only，no sooner，no longer，nowhere，by no means，at no time，on no account，in no case，under no circumstances等置于句首时，其后用部分倒装。
(1)Never have I seen a situation which made him so disheartened.我从没见过让他这么沮丧的情形。(2)Not until recently the development of tourist activities in the rural districts.直到最近他们才鼓励在乡村地区发展旅游活动。(3)At no time the rules of the game，so it was unfair to punish them.他们实际上没有违反比赛的规则，处罚他们是不公平的。(4) a pay increase，the saleswomen want reduced working hours as well.不但女销售员想要加薪，她们还要求减少工作时间。
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did they encourage
did they actually break
Not only do they want
Ⅰ.单句语法填空1. (trap) in the traffic jam，he was late for the finance meeting.2.Owing her assistance，we succeeded in starting the engine.3.An explosion happened in the mine， (leave) twenty-two miners trapped.4.My mother has no appetite food，so I cook some dishes easy to digest for her.5.A local newspaper remarked that the number of literary masterpieces was the decrease.
Trapped
to
leaving
for
on
Ⅱ.完成句子6.I occupying too much of your time.占用你那么多的时间我非常抱歉。7.She marriage by pretending she was pregnant.她假装已怀孕而骗他结婚。8.The number of the journalists this year.今年新闻记者的数量从1 200减少到了900。
owe you an apology for
trapped him into
decreased from 1,200 to 900
9.It rained heavily in the south， in several provinces.南方下了大雨，在几个省区造成严重洪灾。10. that the security situation in this country would be so severe.(部分倒装；occur)汤姆从没想到这个国家的安全形势会那么严峻。
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causing serious flooding
Never did it occur to Tom