选择性必修一
Unit 5 Revealing nature (2)
Using language
Listening
Learning objectives
1. Get the main idea of the passage and list expressions
related to biodiversity by reading.
2. Get the main idea of the listening material and write down
useful expressions related to the topic of cells and bacteria.
3. Act out the conversation about cells and bacteria.
4. Make a new conversation about biodiversity.
What is biodiversity in your
mind?
Reading for information
The main idea of the passage:
It introduces the largest animal species: the blue whale and the
toughest species — the water bear and their characteristics.
1. What species are mentioned and what is special about them?
2. What other unusual life forms do you know of?
Reading for information
1. What species are mentioned and what is special about them?
Earth is home to millions of different species. Some can be very small,
like bacteria and viruses, which are so small that we cannot see them with
only our eyes. By contrast, the largest animal species so far found on our
planet is the blue whale, which can grow up to almost 30 metres in length
and weigh over 130,000 kilos.
Reading for information
1. What species are mentioned and what is special about them?
The toughest species is probably the water bear. This tiny organism
can survive temperatures from 150℃ to a below freezing -272℃. To best
survive in their environment, each species has developed its own unique
physical characteristics.
Reading for information
1. What species are mentioned and what is special about them?
Two species are mentioned:
The blue whale and the water bear. The blue whale is the largest
animal species on earth, which can grow up to almost 30 metres in length
and weigh over 130,000 kilos. The water bear is the toughest species,
which can survive in extreme temperature.
Reading for information
2. What other unusual life forms do you know of?
Vipers, elephants and pandas are very unusual. You can have your own
answers.
Reading for information
A map of the Galapagos Islands
Tortoises, mangroves and iguanas are mentioned.
Find out the species mentioned.
ancestor scientific be native to primitive
habitat appearance be home to ecosystem
Complete the paragraphs.
The Galapagos Islands are renowned worldwide for their unique
biodiversity. The Giant Tortoise Reserve on Santa Cruz several
species of giant tortoise that the Galapagos Islands. The
island is also home to the Charles Darwin Research Station, where
studies are carried out.
is home to
are native to
scientific
Complete the paragraphs.
Mangroves are one of the coastal plants that grow on Isabela. They
serve as the for various birds and fish, and are very important to
the .
habitats
ecosystem
Complete the paragraphs.
Iguanas can be found on San Cristobal. They have a very special
, with comb-like spines on their back. There is evidence that
all the different iguanas have developed from more ones and
share a common .
appearance
primitive
ancestor
Complete the paragraphs.
1. The existence of a large number of different kinds
of animals and plants which make a balanced
environment.
2. The simplest and smallest forms of life.
3. Oganics.
biodiversity
organic matters
bacteria
Useful Words
4. The system in your body that produces substances
to help it fight against infection and disease.
5. All the plants and living creatures in a particular area
considered in relation to their physical environment.
6. The smallest unit of living matter that can exist on its
own.
cell
immune
system
ecosystem
Useful Words
When you listen to the podcast, it is important to find out the
purpose of it. Before listening, think about what topics might be
discussed.
The main idea of the passage is:
something about cells and bacteria.
Listening for main idea
1. Biodiversity is important.
2. Bacteria are always harmful to humans.
3. Some species of bacteria are used in food production.
4. Many species of bacteria recycle dead organic matter.
5. Our immune systems are able to fight off all germs.
Listen and choose the
statements that are made.
During the podcast, listen carefully to each question and try to
understand the main ideas within the responses.
Learning to learn
1. Biodiversity is important.
2. Bacteria are always harmful to humans.
3. Some species of bacteria are used in food production.
4. Many species of bacteria recycle dead organic matter.
5. Our immune systems are able to fight off all germs.
N
F
N
T
T
Listen and choose the
statements that are made.
As you listen, make notes of key information such as key
words, numbers and facts. This will help you understand and
remember the information you hear.
Learning to learn
l Every living thing is 1 . They are like
2 .
l In the human body there are about 3 human cells and around
4 bacteria cells.
l Most bacteria in the human body can 5 .
l In the food production process, bacteria can 6 dead organic
matter.
Listening for detailed information
l Every living thing is . They are like
.
l In the human body there are about human cells and around
bacteria cells.
l Most bacteria in the human body can .
l In the food production process, bacteria can dead organic
matter.
made up of cells
bricks that are used to build houses
break down
thirty trillion
help digestion
thirty-nine trillion
Listening for detailed information
Do you know about...? Have you heard of...?
By the way, … In fact, ...
Actually, .... Speaking of which,...
The useful expressions
Checking background knowledge
Do you know about...? Have you heard of ...?
Adding information
By the way, … Actually, ....
In fact,.... Speaking of which, ...
The useful expressions
Student’s work
Speaking
Criteria
Pronunciation
and intonation
30’
Language
(useful
expressions)
30’
Content
40’
Overall
performance
100’
Score
Comment
Student’s work
Methods
survey method
experimental method
observation method
assess to information method
......
Summary
1. Get the main idea of the passage and list expressions
related to biodiversity by reading.
2. Get the main idea of the listening material and write down
useful expressions related to the topic of cells and bacteria.
3. Act out the conversation about cells and bacteria.
4. Make a new conversation about biodiversity.
Option 1
Work in pairs to discuss what you know about cells and bacteria.
Option 2
Work in pairs to talk about biodiversity in different regions of
China, using the words and expressions in this section.
Homework
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