外研版(2019)选择性必修二Unit 5 A delicate world Starting out精品课件（20张PPT）
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| 名称 | 外研版(2019)选择性必修二Unit 5 A delicate world Starting out精品课件（20张PPT） |  | |
| 格式 | ppt | ||
| 文件大小 | 35.5MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 外研版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2021-01-19 15:58:46 | ||
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外研版英语 选择性必修第二册
Unit 5 A delicate world
Period 1 Staring out & Undertanding ideas
Starting out
extensive deforestation
lead to......
1. serious soil erosion;
2. desertification;
3. shorage of freshwater;
4. Severe drought
......
1. What is happening to the area?
The water area is shrinking.
2. What would a later satellite image show?
The water area will be smaller.
3. What do you think caused these changes?
Maybe it's due to over exploitation; or human over exploitation.
1. Are humans part of Earth's ecosytems? Why?
2. In what ways can humans affect ecosytems?
Reference:
A. Man is a part of nature. Human activities have become an influence on the stability of the natural environment of all spheres on earth.
B. Degradation of forest and grassland vegetation, loss of biodiversity, soil erosion, pollution aggravating, the greenhouse effect of the atmosphere, and the destruction of the ozone layer, have sounded the alarm for human beings.
Understanding ideas
1. Animals in the pictures:
___________________
penguins, a bird
2. What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this?
Possible answers:
a. The penguin's habitat will be destroyed
b. Ecosystems across the island will change comepletely over time.
c. ....
Rats ate the birds' eggs.
Cats hunted rats and mice.
Cats hunted birds for food.
Keep rabbits for meat
Rabbits were rampant. and ate the native vegetation and digging holes.
Parakeets died out in 1891
1. Invasive alien species are one of the biggest causes of biodiversity loss and species extinction.
2. Alien invasive species such as animals, plants or other organisms are introduced to a new native environment, which may adversely affect the biodiversity ecosystem service fun_ction or human welfare.
Parts
Paragrphs
The main idea
Part 1
Para 1
Part 2
Para 2,3,4,5
Part 3
Para 6
Introduce the present ecological situation of the island.
Ecological chaos happened to the island in the past.
A program has been made to protect the island.
Suggested answer: _____
A
Actions
Purposes
Results
Humans arrived on the island
To live there
Rats and mice were brought there by accident, and
To control the rats and mice
ate birds' eggs and attacked baby birds.
Cats were brought to the island
Cats ate the birds too.
Actions
Purposes
Results
Rabbits were introduced to the island.
as a source of food for humans
Rabbits multiplies and caused soil erosion, and provided plentiful food for the cats.
A virus was released onto the island.
To remove all the rabbit from the island.
The rabbit population decreased.
Poison was dropped from helicopters.
To solve the rat, mouse and rabbit problem.
The island's ecology is on the road to recovery.
Post reading
1. What is your understanding of “...we humnas owe it to the island to give it a happy ending”?
The destruction of the island's ecosystem was caused by animals that humans had accidentally brought with them. Human intervention has further undermined the island's ecological balance. So man should make an attempt to restore the island's natural balance.
2. Do you think it was right to eradicate the “pest” from Macquarie Island? Give your reasons.
1. I think it wrong to eradicate the “pest” there. Here are some reasons.
2. Without pests, there would be no creatures that feed on them, and countless creatures would be wiped out, causing great damage to biodiversity and resulting in a more serious consequence than the existence of these so-called pests.
3. How could similar situations be avoided in the future?
1. The introduction of biological species resources from abroad shall be registered or examined and approved according to law, and corresponding safety control measures shall be taken.
2. The government should make the continuous improvement of the existing laws on the introduction of alien species.
3. Deepening international cooperation, prevention and control of alien species invasion will surely achieve greater results.
Language appreciation
1. 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.
?[句式分析] “in turn”: 反过来； “more cats hunting the birds” 动名词的复合结构作宾语；“that parakeets.... the island”为that引导的表语从句。
?[尝试翻译] 这反过来又导致更多猫捕食鸟类。最终结果是，曾经数量众多，原产于该岛的长尾鹦鹉于1891年灭绝了。
Language appreciation
2. Experts felt it necesary to come up with a plan to remove all the rabbits from the island.
?[句式分析]“felt it necessary”构成动词+it (“it”作形式宾语)+ adj(作宾语补足语)，“to come up with a plan” 不定式短语为真正主语后置；“to remove all the rabbits from the island”为不定式短语作后置定语，修饰plan.
?[尝试翻译] 专家认为有必要提出一项计划，把所有的兔子从岛上赶走。
Language appreciation
3. It turned out that they developed an immunity to the virus, and their numbers exploded once again.
?[句式分析] “It”作形式主语； that引导的主语从句后置；“an immunity to the virus” 意为“对病毒的免疫力”； “once again”意为“再一次”
?[尝试翻译] 结果它们对病毒产生了免疫力，而它们的数量再次激增。
1. out of control
7. fail to do sth
2. remove...from...
8. turn out
3. in harmony with
9. every last
4. once and for all
10. provide...for...
5. infrom sb of sth
11. be introduced to...
6. develop an appetite for
12. in consequence
1. Review the vocabulary and the language ponits of the text.
2. Read the text and have a better understanding of it.
3. Write a short passage on how to live in harmony with nature.
Unit 5 A delicate world
Period 1 Staring out & Undertanding ideas
Starting out
extensive deforestation
lead to......
1. serious soil erosion;
2. desertification;
3. shorage of freshwater;
4. Severe drought
......
1. What is happening to the area?
The water area is shrinking.
2. What would a later satellite image show?
The water area will be smaller.
3. What do you think caused these changes?
Maybe it's due to over exploitation; or human over exploitation.
1. Are humans part of Earth's ecosytems? Why?
2. In what ways can humans affect ecosytems?
Reference:
A. Man is a part of nature. Human activities have become an influence on the stability of the natural environment of all spheres on earth.
B. Degradation of forest and grassland vegetation, loss of biodiversity, soil erosion, pollution aggravating, the greenhouse effect of the atmosphere, and the destruction of the ozone layer, have sounded the alarm for human beings.
Understanding ideas
1. Animals in the pictures:
___________________
penguins, a bird
2. What kind of changes would take place if cats, rats and rabbits were introduced to an environment like this?
Possible answers:
a. The penguin's habitat will be destroyed
b. Ecosystems across the island will change comepletely over time.
c. ....
Rats ate the birds' eggs.
Cats hunted rats and mice.
Cats hunted birds for food.
Keep rabbits for meat
Rabbits were rampant. and ate the native vegetation and digging holes.
Parakeets died out in 1891
1. Invasive alien species are one of the biggest causes of biodiversity loss and species extinction.
2. Alien invasive species such as animals, plants or other organisms are introduced to a new native environment, which may adversely affect the biodiversity ecosystem service fun_ction or human welfare.
Parts
Paragrphs
The main idea
Part 1
Para 1
Part 2
Para 2,3,4,5
Part 3
Para 6
Introduce the present ecological situation of the island.
Ecological chaos happened to the island in the past.
A program has been made to protect the island.
Suggested answer: _____
A
Actions
Purposes
Results
Humans arrived on the island
To live there
Rats and mice were brought there by accident, and
To control the rats and mice
ate birds' eggs and attacked baby birds.
Cats were brought to the island
Cats ate the birds too.
Actions
Purposes
Results
Rabbits were introduced to the island.
as a source of food for humans
Rabbits multiplies and caused soil erosion, and provided plentiful food for the cats.
A virus was released onto the island.
To remove all the rabbit from the island.
The rabbit population decreased.
Poison was dropped from helicopters.
To solve the rat, mouse and rabbit problem.
The island's ecology is on the road to recovery.
Post reading
1. What is your understanding of “...we humnas owe it to the island to give it a happy ending”?
The destruction of the island's ecosystem was caused by animals that humans had accidentally brought with them. Human intervention has further undermined the island's ecological balance. So man should make an attempt to restore the island's natural balance.
2. Do you think it was right to eradicate the “pest” from Macquarie Island? Give your reasons.
1. I think it wrong to eradicate the “pest” there. Here are some reasons.
2. Without pests, there would be no creatures that feed on them, and countless creatures would be wiped out, causing great damage to biodiversity and resulting in a more serious consequence than the existence of these so-called pests.
3. How could similar situations be avoided in the future?
1. The introduction of biological species resources from abroad shall be registered or examined and approved according to law, and corresponding safety control measures shall be taken.
2. The government should make the continuous improvement of the existing laws on the introduction of alien species.
3. Deepening international cooperation, prevention and control of alien species invasion will surely achieve greater results.
Language appreciation
1. 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.
?[句式分析] “in turn”: 反过来； “more cats hunting the birds” 动名词的复合结构作宾语；“that parakeets.... the island”为that引导的表语从句。
?[尝试翻译] 这反过来又导致更多猫捕食鸟类。最终结果是，曾经数量众多，原产于该岛的长尾鹦鹉于1891年灭绝了。
Language appreciation
2. Experts felt it necesary to come up with a plan to remove all the rabbits from the island.
?[句式分析]“felt it necessary”构成动词+it (“it”作形式宾语)+ adj(作宾语补足语)，“to come up with a plan” 不定式短语为真正主语后置；“to remove all the rabbits from the island”为不定式短语作后置定语，修饰plan.
?[尝试翻译] 专家认为有必要提出一项计划，把所有的兔子从岛上赶走。
Language appreciation
3. It turned out that they developed an immunity to the virus, and their numbers exploded once again.
?[句式分析] “It”作形式主语； that引导的主语从句后置；“an immunity to the virus” 意为“对病毒的免疫力”； “once again”意为“再一次”
?[尝试翻译] 结果它们对病毒产生了免疫力，而它们的数量再次激增。
1. out of control
7. fail to do sth
2. remove...from...
8. turn out
3. in harmony with
9. every last
4. once and for all
10. provide...for...
5. infrom sb of sth
11. be introduced to...
6. develop an appetite for
12. in consequence
1. Review the vocabulary and the language ponits of the text.
2. Read the text and have a better understanding of it.
3. Write a short passage on how to live in harmony with nature.