(共13张PPT)
A delicate
world
How do you understand “delicate” in the story of Macquarie Island
A small change can have a huge or even destructive impact on the ecosystem.
食草动物
三级消费者
海草
Roles in a food chain
producer
primary
consumer
secondary
consumer
dissolved chemicals
①
①
①
②
③
absorb
take in
rely on
feed on
prey on
decomposers
Decomposers _______ _______ dead animal and vegetable matter _____ nutrients. The dissolved chemicals are then ________ back into the food chain, _________ by producers.
break down
into
released
to be used
bees in ecosystem
pollinate - help reproduce
collect pollen and nectar
Activity 7
Bees are very important to our food supply because they provide honey.
The bee population is declining.
Without bees, humans would die out.
All human crops depend on bees for pollination.
If bees became extinct, other insects could pollinate enough crops.
Humans are responsible for the decline in the bee population.
Listen to the conversation and choose the true statements.
Activity 8
pesticides and climate change
declining very quickly
have fallen by 17%
be unable to reproduce
Other insects
bees are responsible for pollinating about 70%
would die out
Activity 9
You must be kidding!
I don’t believe it!
Are you sure about …
It’s a fact!
Don’t forget that…
Check it out for yourself…
According to statistics…
Work in pairs and make a new conversation
Choose one species you're interested in.
Try to use the words and expressions in the listening practice.
Tiger
What would happen if ... died out !
3 Things I learned
2 Things I found interesting
1 Question I have
3-2-1 SUMMARY
Eventually we'll realize that if we destroy the ecosystem, we destroy ourselves
Assignment:
Accumulate useful words\ expressions you've learned in this section
Preview the next passage“Why Shennongjia”and finish Activity 1 and 3
Thanks for watching(共19张PPT)
Macquarie Island:
from Chaos to Conservation
Book5 Unit 5 A Delicate World Understanding Ideas
I am standing _____ Macquarie Island, ______ the South-west Pacific Ocean, ________ (中途）between Australia and Antarctica. Strong winds and stormy seas have helped _________ （塑造） its long, thin shape. The green grass and bare rock of its landscape _______________________（对比鲜明）, _____________ it a wild and natural beauty.
on
in
halfway
sculpt
contrast dramatically
giving
_____ visitor would think ______ surprising ______ the island is a UNESCO World Heritage Site. ___________ they ________ (未能做到) imagine _____ its __________________ (本土动物, including royal penguins, king penguins, and elephant seals, existed ________________________ their natural habitat for thousands of years.
No
it
that
in perfect harmony with
fail to
how
native inhabitants
Nor would
Nor
【nor的用法】nor为否定词，用在一个否定句之后来引出另一个相关的否定句。
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.
1
句意：他们也不难想象出，数千年来，包括帝企鹅、王企鹅和象海豹在内的当地动物是如何与其自然栖息地完美地和谐共存的。
nor的倒装结构：
nor+助动词 / 情态动词+主语+谓语动词+其他成分
例：
1.她没有打字经验，那种技术也引不起她的兴趣。
_____________________________________ _________________.
2. 你不能撤约，任何人都不能。
__________________________________________________.
3. 他没再去过，也没写信致歉。
_______________________________________________.
She has no experience in typing, nor does the skill interest her
You can't cancel the contract，nor can anybody else
He never went again, nor did he write to apologize
But the island’s more recent history tells a different ______ (n.叙述，描述). It’s a tragic ____ (n.故事) that began in 1810 _____ humans arrived on the island. In their ships they __________ (adv. 不知情地) brought rats and mice. These small animals quickly __________ (占领) the island, ____ (eat) the birds’ eggs and _____ (attack) any baby birds. Cats were brought to the island to control the rats and mice. Unfortunately, the cats _______(adv.后来，随后) ______ (对…产生食欲) the birds, too.
story
story
when
took over
eating
attacking
unknowingly
But the island’s more recent history tells a different story (叙述，描述). It’s a tragic story (故事) that began in 1810 when humans arrived on the island. In their ships they unknowingly brought rats and mice. These small animals quickly took over the island, eating the birds’ eggs and attacking any baby birds. Cats were brought to the island to control the rats and mice. Unfortunately, the cats ______________ (adv.后来，随后) _________________________(对…产生食欲) the birds, too.
subsequently
developed an appetite for
develop a taste for… /an interest in…
develop a close friendship with… /the habit of …
Meanwhile, rabbits _____ (introduce) to the island as a ______ (来源)of food for humans. _______ (自由，不受拘束) on the island, they did _____ rabbits do best – they ________ (翻倍) rapidly and began _____ (eat) the native vegetation and _____ (dig) holes, ______ caused soil erosion. The _____ (explode) rabbit population provided ______ (plenty) food for the cats,_____ (mean) that _____ number of cats also increased. This ______ (相应地)led to more cats ______ (hunt) the birds. The end result was ______ parakeets, once large in number and native to the island, _________ (灭绝) in 1891.
were introduced
source
Loose
what
multiplied
eating
digging
which
exploding
plentiful
meaning
the
Meanwhile, rabbits were introduced to the island as a source of food for humans. Loose on the island, they did what rabbits do best – they multiplied rapidly and began eating the native vegetation and digging holes, which caused soil erosion. The exploding rabbit population provided plentiful food for the cats, meaning that the number of cats also increased.
This _________(相应地)led to more cats ____(hunt) the birds. The end result was ______ parakeets, once large in number and native to the island, _________ (灭绝) in 1891.
in turn
that
died out
hunting
multiply v. （使）增加；（使）倍增；（使）繁殖；
multiplies-multiplying-multiplied
Loose on the island, they did what rabbits do best – they multiplied rapidly and began eating the native vegetation and digging holes, which
caused soil erosion.
3
句意：由于在岛上放任其生存，兔子做了自己最擅长的事——飞快地繁殖，它们开始吃当地植被并挖洞，造成了土壤侵蚀。
例：
1. Their problems _____________ since last year.
2. 在实验室里繁殖这些细菌是可能的。
____________________________________
_______________.
have multiplied
It is possible to multiply these bacteria in the laboratory
This in turn led to more cats hunting the birds. The end result was that parakeets, once large in number and native to the island, died out in 1891.
4
in turn 轮流，依次，反过来
句意：这反过来就有更多猫捕食鸟类。最终结果是，曾经数量众多的当地物种长尾小鹦鹉在1891年灭绝。
例1：女孩子们饭后轮流擦桌子。
The girls took it ______ to wipe down the tables after meals.
in turn
【拓展】
take turns to do sth / in (doing) sth. 轮流做某事
It's one's turn to do sth. 轮到某人做某事
take one's turn 依次，轮到某人
by turns 轮流，依次
例：
1. It's your turn _______ (recite) the passage.
2. We take turns to make / in making dinner.
= We make dinner by ____ (turn).
to recite
turns
* in turn 表示“轮流；反过来”，而in return (for)
表示“作为（对……）的回报”。
by turns和take turns中的turn用复数形式。
die out 灭绝；消失
例：Laws should be passed to protect pandas.
Otherwise, they are certain to _______.
die out
【拓展】die相关的短语
① die of 因……而死
die of illness (heart trouble, cancer, a fever,
hunger, etc)
② die from 由于……而死
die from an earthquake (a traffic accident, wound,
lack of food,over work, carelessness, drinking,etc)
③ die away 指声音、光等渐渐消失；风等渐渐减弱、
停下来；也可指人慢慢死去
Even after Macquarie Island became an official nature reserve in the 1970s, the rabbits remained ________ (失去控制). Experts felt ____ necessary to come up with a plan ______ (remove) all the rabbits _____ the island. With this goal_______ (mind), a virus was ________ (释放) onto the island. But although the virus caused the rabbit population to ______ (减少，降低) ______ 130,000 ____ around 10,000, it also meant less food for the cats.
out of control
it
to
remove
on
in
mind
released
decrease
from
to
decrease v. （使）减少；（使）变小
n. 减少；降低
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.
5
句意：然而，虽然病毒使得兔子的数量从130,000降到约100,000只，但这也意味着猫的食物变少了。
例：人们应该减少脂肪的摄入量。
_________________________________________.
People should decrease the amount of fat they eat
【拓展】decrease to 减少到
decrese in sth （在某方面）降低，减少
decrease by 减少了
on the decrease 在减少
例：
1.A local newspaper remarks that crime is __ the
decrease.
2. The traffic accident in the city decreased __ 30%
last year.
3. The population of China has increased __ about
1.4 billion.
on
by
to
The cats ________ (结果) turned their attention – and their stomachs – ______ (回到) the native birds, _____ (kill) _____ （多达） 60,000 each year. In the 1980s, traps and dogs were used to catch the cats. The last Macquarie Island cat was caught in 2000.
in consequence
back to
killing
up to
But _____ the saying goes, “While the cat’s away, the mice will play.” With the ______ (depart) of the cats ______ the island, the mouse and rat population started to increase. And remember those 10,000 ______ rabbits It _______ that they developed _____ (immune) to the virus, and their numbers exploded once again. Then, in 2006, the _____ (rabbit dig) caused some land to collapse, and ____ (kill) _____ substantial number of penguins. This incident made____ clear_____ the rat, mouse and rabbit problem needed _____ (solve) once and for all ( ________ ).
as
departure
from
or so
turned out
an immunity
rabbits’ digging
killed
a
it
that
solving
彻底地，一次了结地
So, I am here on Macquarie Island to participate _____ the programme to_____ (解决) this __ (正是的，恰好的，同一的) problem. The first step involved poison _________(drop) from helicopters. The next step is _______ (remove) the last ________ (残存的入侵的) species, and that’s ________ I come in – with my dogs. They have been trained to find __________(剩下的每一个), without harming the native animals. This ______ (干预，介入) is a long, ____________ (迟来的结局) a sad story, but we humans owe _____ to the island _____ (give) it a happy ending.
in
tackle
very
being dropped
to remove
remaining invading
where
every last/single one
intervention
much-delayed ending to
it
to give
owe it to sb to do sth.应该为某人做...
we owe it to the heroes to build a memorial.
Postscript :
In 2014, Macquarie Island was declared _________ (没有害兽、虫、鸟的） and the island‘s ecology is finally ________________________ （走上复苏之路）.
pest-free
on the road to recovery
