外研版（2019）高中英语选择性必修第二册Unit5 A delicate world- Using language课件17张PPT
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| 名称 | 外研版（2019）高中英语选择性必修第二册Unit5 A delicate world- Using language课件17张PPT |  | |
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| 资源类型 | 教案 | ||
| 版本资源 | 外研版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2022-05-27 15:49:48 | ||
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(共17张PPT)
Unit 5 A delicate world
Using language
Look at the sentences and answer the questions.
a No visitor would think it surprising that the island is a UNESCO World Heritage Site.
b Experts felt it necessary to come up with a plan to remove all the rabbits from the island.
Observe the rules
1 What does “it” refer to in sentences (a) and (b)
2 What’s the sentence element of “it”
It’s an empty object.
当动词不定式，动名词和从句作宾语时，为了保持句子的结构平衡，常用it作形式宾语，而将真正的宾语放到句子后部去。
Translate
他发现学好一门外语是不容易的。
He found it not easy to learn a foreign language well.
我认为我们开这个会是有必要的。
I think it necessary that we have the meeting.
Grammar: It as an empty object
it 作为形式宾语的几种情况
1. 动词 + it + 宾语补足语 + 不定式/动名词/从句，常见于make, think, leave, find, believe 等动词。
宾语补足语：形容词、名词、过去分词等
Translate
我发现做好这件事不容易。
I find it difficult to do the job well.
我们认为抱怨是没有用的。
We think it no use complaining.
2. 动词 + it + when/if 从句，常见于appreciate, enjoy, like, prefer, love, dislike等动词之后。
Translate
如果您能帮助我们，我们会很感激。
We really appreciate it if you could do us a favour.
我不喜欢有人嘴里含着食物说话。
I hate it when people speak with their mouth full.
it 作为形式宾语的几种情况
3. 动词 + it + 介词 + that从句，常见于 owe it to sb. that… (把……归功于)， take it for granted that… (认为……理所当然)，put it to sb. that… (向某人挑明) 等结构中。
Translate
多亏有你，我们现在才仍然活着。
We owe it to you that we are still alive.
我还想当然地以为他总能随叫随到呢。
I just took it for granted that he’d always be around.
it 作为形式宾语的几种情况
Exercise
Rewrite the underlined parts using it as an empty object.
many people think it a good idea to keep this turtle as a pet
believe it no big issue to release them into the wild
people have found it a threat to other species to release these turtles into the wild
Experts consider it important for owners to keep their pets in an enclosed area
Language points – P53
一种淡水龟
（动植物）原属于……的
把……当宠物养
问题不大
一个对……的威胁
一个封闭的空间
合适的动物收养所
a species of freshwater turtle
be native to
keep sth. as a pet
be no big issue
a threat to
an enclosed area
an appropriate animal shelter
Language points – P53
翻译：近些年来，越来越多的宠物龟逃跑或者被放生。
In recent years, more and more pet sliders have escaped or been released from home.
Recent years have seen/witnessed more and more pet sliders escaping or being released from homes.
see: to be the time/place when/where an event happens
四月二十八日学校举办了成人礼。
April 28th saw the coming-of-age ceremony at School.
在这座体育场里进行过许多激动人心的足球比赛。
This stadium has seen many thrilling football games.
Ecosystems
1 What does the diagram show
The diagram shows a food chain.
2 What are the relationships between the living things
The living things are closely connected with each other by the food they eat.
Secondary consumers prey on primary consumers, primary consumers feed on producers, and producers absorb light from the sun, and water and dissolved nutrients from the soil, which are provided by decomposers.
prey on/upon sb/sth: (of an animal or a bird 兽；鸟) to hunt and kill another animal for food 捕食；猎获
Complete the passage with the correct form of the words and expressions in Activity 5.
In a woodland ecosystem, trees and other plants are producers. They 1 _______ water, and take in nutrients from the soil and energy from the sun. Insects are an example of a primary consumer. They 2 _______ the producers to provide food for them, and are 3 _______ by secondary consumers: small mammals and birds. They 4 _______ the primary consumers. Worms, fungi and bacteria are decomposers. They 5 __________ animal waste and the remains of living things. The chemicals these decomposers 6 ________ fertilise the soil and give the plants the nutrients they need to grow.
Ecosystems
absorb
rely on
fed on
prey on
break down
release
Language points – P54
absorb v.
被吸引；专心致志
溶解态营养物
rely on
feed on
prey on
decomposer
把……分解为
vegetable matter
被释放回食物链中
在林地生态系统中
take in
吸收；理解；
be absorbed in sth./doing
dissolved nutrients
依靠
以……为食
捕食；猎获
分解者
break down… into…
植物性物质 matter [U] n. 物质（统称）
be released back into the food chain
in a woodland ecosystem
吸收；理解；收容；欺骗；参观
Language points – P54
primary consumer
secondary consumer
mammal
剩余物；残骸
fertilise v.
fertilisation n.
fertiliser n.
初级消费者
次级消费者
哺乳动物
the remains (pl.) of…
施肥于
肥料
Pre-listening: background information
One of the oldest species in the ecosystem, the honey bee has been in existence for millions of years.
A honey bee can fly as fast as 24 kilometres per hour and its wings can beat 200 times per second.
In just one journey to collect pollen and nectar, one single honey bee can pollinate as many as 50 to 100 flowers.
pollen /'p l n/ n.: a fine powder produced by flowers
nectar /'nekt / n.: a sweet liquid produced by flowers and collected by bees for making honey
pollinate /'p l ne t/ v.: to put pollen into a flower or plant so that it produces seeds
While-listening
Listen to the conversation and choose the true statements.
1 Bees are very important to our food supply because they provide honey.
2 The bee population is declining.
3 Without bees, humans would die out.
4 All human crops depend on bees for pollination.
5 If bees became extinct, other insects could pollinate enough crops.
6 Humans are responsible for the decline in the bee population.
While-listening
Listen again and complete the flowchart.
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
Language points – P55
现存的，实际存在的
花粉 n. - 授粉 v.
花蜜
灭绝
依靠
作为原因；成为起因
……的结合/混合
没有蜜蜂，庄稼无法繁殖。
弥补……的损失
夸张的 adj.
夸张；言过其实 v./n.
in existence = existing
pollen n. - pollinate v.
nectar
die out/become extinct adj.
depend/rely on
be responsible for
a combination of
_________ bees, crops _________ (be) unable to ___________.
compensate for the loss of…
exaggerated
exaggerate/exaggeration
extinction [U] n.
Without
would be
reproduce
Unit 5 A delicate world
Using language
Look at the sentences and answer the questions.
a No visitor would think it surprising that the island is a UNESCO World Heritage Site.
b Experts felt it necessary to come up with a plan to remove all the rabbits from the island.
Observe the rules
1 What does “it” refer to in sentences (a) and (b)
2 What’s the sentence element of “it”
It’s an empty object.
当动词不定式，动名词和从句作宾语时，为了保持句子的结构平衡，常用it作形式宾语，而将真正的宾语放到句子后部去。
Translate
他发现学好一门外语是不容易的。
He found it not easy to learn a foreign language well.
我认为我们开这个会是有必要的。
I think it necessary that we have the meeting.
Grammar: It as an empty object
it 作为形式宾语的几种情况
1. 动词 + it + 宾语补足语 + 不定式/动名词/从句，常见于make, think, leave, find, believe 等动词。
宾语补足语：形容词、名词、过去分词等
Translate
我发现做好这件事不容易。
I find it difficult to do the job well.
我们认为抱怨是没有用的。
We think it no use complaining.
2. 动词 + it + when/if 从句，常见于appreciate, enjoy, like, prefer, love, dislike等动词之后。
Translate
如果您能帮助我们，我们会很感激。
We really appreciate it if you could do us a favour.
我不喜欢有人嘴里含着食物说话。
I hate it when people speak with their mouth full.
it 作为形式宾语的几种情况
3. 动词 + it + 介词 + that从句，常见于 owe it to sb. that… (把……归功于)， take it for granted that… (认为……理所当然)，put it to sb. that… (向某人挑明) 等结构中。
Translate
多亏有你，我们现在才仍然活着。
We owe it to you that we are still alive.
我还想当然地以为他总能随叫随到呢。
I just took it for granted that he’d always be around.
it 作为形式宾语的几种情况
Exercise
Rewrite the underlined parts using it as an empty object.
many people think it a good idea to keep this turtle as a pet
believe it no big issue to release them into the wild
people have found it a threat to other species to release these turtles into the wild
Experts consider it important for owners to keep their pets in an enclosed area
Language points – P53
一种淡水龟
（动植物）原属于……的
把……当宠物养
问题不大
一个对……的威胁
一个封闭的空间
合适的动物收养所
a species of freshwater turtle
be native to
keep sth. as a pet
be no big issue
a threat to
an enclosed area
an appropriate animal shelter
Language points – P53
翻译：近些年来，越来越多的宠物龟逃跑或者被放生。
In recent years, more and more pet sliders have escaped or been released from home.
Recent years have seen/witnessed more and more pet sliders escaping or being released from homes.
see: to be the time/place when/where an event happens
四月二十八日学校举办了成人礼。
April 28th saw the coming-of-age ceremony at School.
在这座体育场里进行过许多激动人心的足球比赛。
This stadium has seen many thrilling football games.
Ecosystems
1 What does the diagram show
The diagram shows a food chain.
2 What are the relationships between the living things
The living things are closely connected with each other by the food they eat.
Secondary consumers prey on primary consumers, primary consumers feed on producers, and producers absorb light from the sun, and water and dissolved nutrients from the soil, which are provided by decomposers.
prey on/upon sb/sth: (of an animal or a bird 兽；鸟) to hunt and kill another animal for food 捕食；猎获
Complete the passage with the correct form of the words and expressions in Activity 5.
In a woodland ecosystem, trees and other plants are producers. They 1 _______ water, and take in nutrients from the soil and energy from the sun. Insects are an example of a primary consumer. They 2 _______ the producers to provide food for them, and are 3 _______ by secondary consumers: small mammals and birds. They 4 _______ the primary consumers. Worms, fungi and bacteria are decomposers. They 5 __________ animal waste and the remains of living things. The chemicals these decomposers 6 ________ fertilise the soil and give the plants the nutrients they need to grow.
Ecosystems
absorb
rely on
fed on
prey on
break down
release
Language points – P54
absorb v.
被吸引；专心致志
溶解态营养物
rely on
feed on
prey on
decomposer
把……分解为
vegetable matter
被释放回食物链中
在林地生态系统中
take in
吸收；理解；
be absorbed in sth./doing
dissolved nutrients
依靠
以……为食
捕食；猎获
分解者
break down… into…
植物性物质 matter [U] n. 物质（统称）
be released back into the food chain
in a woodland ecosystem
吸收；理解；收容；欺骗；参观
Language points – P54
primary consumer
secondary consumer
mammal
剩余物；残骸
fertilise v.
fertilisation n.
fertiliser n.
初级消费者
次级消费者
哺乳动物
the remains (pl.) of…
施肥于
肥料
Pre-listening: background information
One of the oldest species in the ecosystem, the honey bee has been in existence for millions of years.
A honey bee can fly as fast as 24 kilometres per hour and its wings can beat 200 times per second.
In just one journey to collect pollen and nectar, one single honey bee can pollinate as many as 50 to 100 flowers.
pollen /'p l n/ n.: a fine powder produced by flowers
nectar /'nekt / n.: a sweet liquid produced by flowers and collected by bees for making honey
pollinate /'p l ne t/ v.: to put pollen into a flower or plant so that it produces seeds
While-listening
Listen to the conversation and choose the true statements.
1 Bees are very important to our food supply because they provide honey.
2 The bee population is declining.
3 Without bees, humans would die out.
4 All human crops depend on bees for pollination.
5 If bees became extinct, other insects could pollinate enough crops.
6 Humans are responsible for the decline in the bee population.
While-listening
Listen again and complete the flowchart.
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
Language points – P55
现存的，实际存在的
花粉 n. - 授粉 v.
花蜜
灭绝
依靠
作为原因；成为起因
……的结合/混合
没有蜜蜂，庄稼无法繁殖。
弥补……的损失
夸张的 adj.
夸张；言过其实 v./n.
in existence = existing
pollen n. - pollinate v.
nectar
die out/become extinct adj.
depend/rely on
be responsible for
a combination of
_________ bees, crops _________ (be) unable to ___________.
compensate for the loss of…
exaggerated
exaggerate/exaggeration
extinction [U] n.
Without
would be
reproduce