外研版（2019）高中英语选择性必修第二册 Unit5 Using language 名师课件(共22张PPT)

(共22张PPT)
Unit5 A delicate world
Using language
Ⅰ
Ⅱ
CONTENTS
Using language
Homework
Using language
Part 1
1.What does “it” refer to in sentences in the following sentences
1
No visitors would think it surprising that the island is a UNESCO World Heritage Site.
Experts felt it necessary to come up with a plan to remove all the rabbits from the island.
it
it
that the island is a UNESCO World Heritage Site
to come up with a plan to remove all the rabbits from the island
2.What is the difference between the sentences in each group
1
No visitor would think it surprising that the island is a UNESCO World Heritage Site.
Experts felt it necessary to come up with a plan to remove all the rabbits from the island.
a
c
b
No visitor would think that the island being a UNESCO World Heritage Site is surprising.
d
Experts felt to come up with a plan to remove all the rabbits from the island was necessary.
Pair work
Look for more!
Look for more sentences with this structure in the reading passage, and summarise its use in your own words.
1
2
3
This incident made it clear that the rat, mouse and rabbit problem needed solving once and for all.
No visitors would think it surprising that the island is a UNESCO World Heritage Site.
Experts felt it necessary to come up with a plan to remove all the rabbits from the island.
Read the passage on P53, then answer the following questions.
2
1. Why is it a big issue to release the pet red-eared slider into the wild
2. What should you do if you are unable to keep it
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
Look at the pictures of the Sailhanba National Forest Park and describe its changes using it as an empty object where appropriate.
3
Describe the changes using it as an empty object.
Pair work
Group discussion
Describe the changes of Zhengzhou using it as an empty object.
4
What does the diagram show
food chain
producer
grasses
sheep
primary
consumer
decomposers
fungi
bacteria
wolf
secondary
consumer
5
producer
grasses
sheep
primary
consumer
decomposers
fungi
bacteria
wolf
secondary
consumer
1
2
3
4
What are the relationships between the living things
② Primary consumers feed on producers.
① Secondary consumers prey on primary consumers.
③ Producers absorb light and water. They also absorb dissolved nutrients from the soil, which are provided by decomposers.
④ Decomposers break down dead animal and vegetable matter into nutrients.
Complete the passage with the correct form of the words and expressions
in Activity 5.
6
absorb
rely on
fed on
prey on
break down
release
Draw a food chain in a woodland ecosystem in groups.
Pair work
1. One of the oldest species in the ecosystem, the honey bee has been in existence for millions of years.
A. Hundreds B. thousands C. millions
2. A honey bee can fly as fast as kilometres per hour and its wings can beat times per second.
A. 2.4; 20 B. 2.4; 200 C. 240; 2000
3. In just one journey to collect pollen and nectar, one single honey bee can pollinate as many as flowers.
A. 2.4; 20 B. 2.4; 200 C. 240; 2000
√
√
√
pesticides and climate change
would die out
Other insets
be unable to reproduce
have fallen by 12%
declining very quickly
bees are responsible for pollinating about 70%
Expressing doubt Responding to doubt
It’s a fact!
Don’t forget that…
Check it out for yourself…
You must be kidding!
I don’t believe it!
Are you sure about…
Work in groups. Talk about what would happen to the ecosystem if another species died out.
Homework
Part 2
Homework
Write a short passage using using it as an empty object about the changes that have taken place in Zhengzhou.