外研版(2019)选择性必修二精品课件：Unit 5 A delicate world Using language课件（21张ppt）
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| 名称 | 外研版(2019)选择性必修二精品课件：Unit 5 A delicate world Using language课件（21张ppt） |  | |
| 格式 | ppt | ||
| 文件大小 | 37.3MB | ||
| 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 16:23:48 | ||
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外研版英语 选择性必修第二册
Unit 5 A delicate world
Period 2 Using languages
a. No visitors would think it surprising that the island is a UNESCO World Heritage Site.
b. No visitors would think that island being a UNESCO World Heritage Site is surprising.
1. What does “it” refer to in sentence (a) ?
In sentences (a) refers to “that the island is a UNESCO World Heritage Site”
c. Experts felt it necessary to come up with a plan to remove all the rabbits from the island.
d. Experts felt to come up with a plan to remove all the rabbits from the island was necessary.
2. What does “it” refer to in sentence (c) ?
In sentences (c) refers to “to come up with a plan to remove all the rabbits from the island ”
3. What is the difference between the sentences in each group?
In the 1st group,
the object of the 1st sentence is replaced by “it”, while
In the 2nt sentence, the object clause is in the position of the object.
In the 2nd group,
the object of the 1st sentence is replaced by “it”, while
in the 2nd sentence, the infintive is in the position of the object.
1. This incident made it clear that the rat, mouse and rabbit problem needed solving once and for all.
2. ...but we humans owe it to the island to give it a happy ending.
Notes:
To balance sentence structure, the auther used an empty object to replaces too long infinitive structures or object clause.
Rewrite the underlined parts using it as an empty object.
1. Due to its cute appearance, many people think keeping this turtle as a pet is a good idea.
2. and some owners believe to release them into the wild is no big issue.
Due to its cute appearance, many people think it a good idea to keep this turtle as a pet is
and some owners believe it no big issue to release them into the wild.
3. These days, people have found to release these turtles into the wild is a threat to other species.
4. Experts consider owners keeping their pets in an enclosed area important
These days, people have found it a threat to other species to release these turtles into the wild.
Experts consider owers it important for owners to keep their pets in an enclosed area.
Describe the changes happening to the parks, using it as an empty object.
the Saihanba National Forest Park
nouns / adjectives
to do / that -clause
breakthrough
grow
impossible
investigate
likely
plant trees
unrealistic
transform
......
......
eg. I think it a breakthrough to transform a desert into a forest.
Possible answers:
1. I believe it likely that more volunteers will help plant more trees around the park.
2. I find it impossible to investigate all the living species in the park at present.
3. I feel it unrealistic for the local people to grow rice and wheat for gian industry.
Before listening
Food chains and
energy exchange
Decomposers break down dead animial and vegetable matter into nutrients. The dissolved chemicals are then released back into the food chain, to be used by producers.
1. What does the diagram show?
2. What are the relationships between the living things?
Everything in the world is related to each other.
Creatures in nature depend upon each other and coexsit with each other.
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 become extinct, other insects could pollinate enough crops.
6. Humans are responsible for the decline in the bee population.
Your answer: ____________
IN a woodland ecosytem, 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 comsumers. worms, fungi and bacteria are decomposers. They
5. _____________ animals waste and the remains of the living things. The chemicals these decomposers 6 ___________ fertilise the soil and give the plants the nutrients they need to grow.
absorb
rely on
preyed on
feed on
break down
release
Learn how to express your doubt or respond to doubt.
1
You must be kidding!
2
I don't believe it!
3
It's a fact!
4
Don't forget that...
5
Are you sure about...?
6
Check it out for yourself...
7
According to statistics...
Expressing doubt
Responding to doubt
1, 2, 5
3, 4, 6, 7
Work in pairs. Talk about what would happen to the ecosytem if another species died out.
Reference:
Every organism plays an irreplaceable role in the ecosystem, even the mouse or a kind of pests. The extinction of one organism may lead to the lack of food for others, while some organisms may lose their natural enemies and have uncontrolled numbers, thus affecting the whole ecosystem and the whole biosphere.
1. ____________
2. ____________
3. ____________
4. ____________
5. ____________
6. ____________
7. ____________
1. Recent years have seen more and more pet sliders escaping or being released from homes.
?[句式分析] 本句主谓部分采用“时间+ have seen”, 其中see意为“见证经历”， 注意主谓人称数的一致性； see sb/sth doing 表示看见正在进行，see sb/sth being done表示看见正在被执行的动作。
?[尝试翻译] 近年来，越来越多的宠物龟逃出家门或被放生。
2. In just one journey to collect pollen and nectar, one single honey bee pollinate as many as 50 to 100 flowers.
?[句式分析] 句中“to collect pollen and nectar”为不定式短语作后置定语，修饰其前面的名词； as many as +数量+ 名词 表示“多达....”, 强调数量之多。
?[尝试翻译] 在一次采集花粉和花蜜的旅程中，一只蜜蜂授粉多达50到100朵花。
1. be native to
7. check out
2. feed on
8. rely on/ upon
3. prey on
9. absorb ... from...
4. break down
10. a combination of
5. take in
11. release... into .. .
6. in existence
12. transform... into ...
1. Review the vocabulary and the language ponits of the text.
2. Listen to the material Page 7 once more and get more information .
3. Write a short passage about impacts of species extinction.
Unit 5 A delicate world
Period 2 Using languages
a. No visitors would think it surprising that the island is a UNESCO World Heritage Site.
b. No visitors would think that island being a UNESCO World Heritage Site is surprising.
1. What does “it” refer to in sentence (a) ?
In sentences (a) refers to “that the island is a UNESCO World Heritage Site”
c. Experts felt it necessary to come up with a plan to remove all the rabbits from the island.
d. Experts felt to come up with a plan to remove all the rabbits from the island was necessary.
2. What does “it” refer to in sentence (c) ?
In sentences (c) refers to “to come up with a plan to remove all the rabbits from the island ”
3. What is the difference between the sentences in each group?
In the 1st group,
the object of the 1st sentence is replaced by “it”, while
In the 2nt sentence, the object clause is in the position of the object.
In the 2nd group,
the object of the 1st sentence is replaced by “it”, while
in the 2nd sentence, the infintive is in the position of the object.
1. This incident made it clear that the rat, mouse and rabbit problem needed solving once and for all.
2. ...but we humans owe it to the island to give it a happy ending.
Notes:
To balance sentence structure, the auther used an empty object to replaces too long infinitive structures or object clause.
Rewrite the underlined parts using it as an empty object.
1. Due to its cute appearance, many people think keeping this turtle as a pet is a good idea.
2. and some owners believe to release them into the wild is no big issue.
Due to its cute appearance, many people think it a good idea to keep this turtle as a pet is
and some owners believe it no big issue to release them into the wild.
3. These days, people have found to release these turtles into the wild is a threat to other species.
4. Experts consider owners keeping their pets in an enclosed area important
These days, people have found it a threat to other species to release these turtles into the wild.
Experts consider owers it important for owners to keep their pets in an enclosed area.
Describe the changes happening to the parks, using it as an empty object.
the Saihanba National Forest Park
nouns / adjectives
to do / that -clause
breakthrough
grow
impossible
investigate
likely
plant trees
unrealistic
transform
......
......
eg. I think it a breakthrough to transform a desert into a forest.
Possible answers:
1. I believe it likely that more volunteers will help plant more trees around the park.
2. I find it impossible to investigate all the living species in the park at present.
3. I feel it unrealistic for the local people to grow rice and wheat for gian industry.
Before listening
Food chains and
energy exchange
Decomposers break down dead animial and vegetable matter into nutrients. The dissolved chemicals are then released back into the food chain, to be used by producers.
1. What does the diagram show?
2. What are the relationships between the living things?
Everything in the world is related to each other.
Creatures in nature depend upon each other and coexsit with each other.
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 become extinct, other insects could pollinate enough crops.
6. Humans are responsible for the decline in the bee population.
Your answer: ____________
IN a woodland ecosytem, 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 comsumers. worms, fungi and bacteria are decomposers. They
5. _____________ animals waste and the remains of the living things. The chemicals these decomposers 6 ___________ fertilise the soil and give the plants the nutrients they need to grow.
absorb
rely on
preyed on
feed on
break down
release
Learn how to express your doubt or respond to doubt.
1
You must be kidding!
2
I don't believe it!
3
It's a fact!
4
Don't forget that...
5
Are you sure about...?
6
Check it out for yourself...
7
According to statistics...
Expressing doubt
Responding to doubt
1, 2, 5
3, 4, 6, 7
Work in pairs. Talk about what would happen to the ecosytem if another species died out.
Reference:
Every organism plays an irreplaceable role in the ecosystem, even the mouse or a kind of pests. The extinction of one organism may lead to the lack of food for others, while some organisms may lose their natural enemies and have uncontrolled numbers, thus affecting the whole ecosystem and the whole biosphere.
1. ____________
2. ____________
3. ____________
4. ____________
5. ____________
6. ____________
7. ____________
1. Recent years have seen more and more pet sliders escaping or being released from homes.
?[句式分析] 本句主谓部分采用“时间+ have seen”, 其中see意为“见证经历”， 注意主谓人称数的一致性； see sb/sth doing 表示看见正在进行，see sb/sth being done表示看见正在被执行的动作。
?[尝试翻译] 近年来，越来越多的宠物龟逃出家门或被放生。
2. In just one journey to collect pollen and nectar, one single honey bee pollinate as many as 50 to 100 flowers.
?[句式分析] 句中“to collect pollen and nectar”为不定式短语作后置定语，修饰其前面的名词； as many as +数量+ 名词 表示“多达....”, 强调数量之多。
?[尝试翻译] 在一次采集花粉和花蜜的旅程中，一只蜜蜂授粉多达50到100朵花。
1. be native to
7. check out
2. feed on
8. rely on/ upon
3. prey on
9. absorb ... from...
4. break down
10. a combination of
5. take in
11. release... into .. .
6. in existence
12. transform... into ...
1. Review the vocabulary and the language ponits of the text.
2. Listen to the material Page 7 once more and get more information .
3. Write a short passage about impacts of species extinction.