外研版（2019）选择性必修第一册Unit5 Revealing Nature Using language Ⅱ P54-55课件(共14张PPT)
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| 名称 | 外研版（2019）选择性必修第一册Unit5 Revealing Nature Using language Ⅱ P54-55课件(共14张PPT) |  | |
| 格式 | pptx | ||
| 文件大小 | 3.9MB | ||
| 资源类型 | 教案 | ||
| 版本资源 | 外研版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2024-07-21 22:49:12 | ||
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(共14张PPT)
新外研版选择性必修Book 1
Using languageⅡP54-55
Unit 5 Revealing nature
To know about cells and bacteria by listening a text
To read a text about the diversity of species in nature
To use different methods to search for information and learn more about biodiversity
Learning objectives
A podcast（播客） is like a radio show that can be downloaded or streamed on the internet and covers a wide range of topics.
bacterium bacteria
pl. 细菌
biodiversity
生物多样性
5
Listen to the podcast and choose the statements
that are made.
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 again and complete the fact sheet.
6
made up of cells
bricks that are used to build houses
thirty trillion
thirty-nine trillion
help with digestion
break down
Jenny: Hello, and welcome to Science Under the Microscope, a science programme
for teens. I’m Jenny.
Josh: And I’m Josh.
Jenny: This week, as part of our series on biodiversity, we are discussing
microorganisms. They are the oldest form of life on Earth. Scientists believe
they first emerged around three and a half billion years ago!
Josh: That’s incredible!
Jenny: But you can only see them with a microscope, as these living things are very
very small. We’re talking about life at the level of the cell. Do you know
about cells, Josh
Josh: Erm... I’m afraid not. What exactly is a cell
Jenny: Every living thing is made up of cells. They are like bricks that are used to
build houses. By the way, most microorganisms are single-celled. This
听力原文：
Now work in pairs. Discuss what you know about cells and bacteria.
Checking background knowledge
Adding information
means that they consist of just one cell.
Josh: How strange!
Jenny: Actually, we’re the ones who are unusual. The vast majority of life on this
planet is made up of single-celled microorganisms. They re everywhere! In
the air, in water, there are even micooanis ... inside you. I’m talking about
bacteria. Have you heard of bacteria, Josh
Josh: I have, Jenny. But bacteria, inside me Yuck!
Jenny: [laughs] That’s right. You have lots of them living in your body. In fact, an
average human body contains about thirty tillin human cells, and around
thirty-nine trillion bacteria cells.
Josh: Seriously Oh, this is making my stomach turn.
Jenny: Speaking of which, most of the bacteria in your body help with digestion.
And they help make the food that goes into your stomach, too. Without
bacteria, we wouldn’t be able to make cheese, yoghurt, vinegar...
Checking background knowledge
Adding information
Josh: Really I didn’t know that!
Jenny: Oh, and bacteria are also useful at the other end of the food production
process. They have an important role dealing with your waste and that of
other organisms.
Josh: Euw! You mean what goes down the toilet
Jenny: Yes. Bacteria break down this waster and other dead, organic matter, like
fallen leaves, into nutrients.
Josh: Oh I get it. And these nutrients go back into the soil where they can be used
by plants!
Jenny: That’s it exactly.
Josh: All right. Although some of the bacteria may cause diseases in humans,
plants and animals, they aren’t all bad...
Read the passage and answer the questions.
8
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. The toughest species is probably the water bear. This tiny
organism can survive temperatures from 150 °C to a below freezing 272°C. To best survive in their environment, each species has developed its own unique physical characteristics.
Each year, scientists identify around 15,000 new species.
However, diversity on our planet is such, that there are
still millions of species on Earth remaining to be
discovered.
1 What species are mentioned and what is special about them
2 What other unusual life forms do you know of
Complete the paragraphs with the correct form of the
words and expressions in the box.
9
is home to
scientific
are native to
habitats
ecosystem
appearance
primitive
ancestor
Work in pairs.
Look at the pictures of the species native to different regions of China.
Talk about biodiversity in China using the words and expressions in this section.
Do online research to find more information.
Speaking
Now talk about what methods you used to collect the information pare your methods with your partner’s and think about which methods are more efficient.
Thank you!
新外研版选择性必修Book 1
Using languageⅡP54-55
Unit 5 Revealing nature
To know about cells and bacteria by listening a text
To read a text about the diversity of species in nature
To use different methods to search for information and learn more about biodiversity
Learning objectives
A podcast（播客） is like a radio show that can be downloaded or streamed on the internet and covers a wide range of topics.
bacterium bacteria
pl. 细菌
biodiversity
生物多样性
5
Listen to the podcast and choose the statements
that are made.
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 again and complete the fact sheet.
6
made up of cells
bricks that are used to build houses
thirty trillion
thirty-nine trillion
help with digestion
break down
Jenny: Hello, and welcome to Science Under the Microscope, a science programme
for teens. I’m Jenny.
Josh: And I’m Josh.
Jenny: This week, as part of our series on biodiversity, we are discussing
microorganisms. They are the oldest form of life on Earth. Scientists believe
they first emerged around three and a half billion years ago!
Josh: That’s incredible!
Jenny: But you can only see them with a microscope, as these living things are very
very small. We’re talking about life at the level of the cell. Do you know
about cells, Josh
Josh: Erm... I’m afraid not. What exactly is a cell
Jenny: Every living thing is made up of cells. They are like bricks that are used to
build houses. By the way, most microorganisms are single-celled. This
听力原文：
Now work in pairs. Discuss what you know about cells and bacteria.
Checking background knowledge
Adding information
means that they consist of just one cell.
Josh: How strange!
Jenny: Actually, we’re the ones who are unusual. The vast majority of life on this
planet is made up of single-celled microorganisms. They re everywhere! In
the air, in water, there are even micooanis ... inside you. I’m talking about
bacteria. Have you heard of bacteria, Josh
Josh: I have, Jenny. But bacteria, inside me Yuck!
Jenny: [laughs] That’s right. You have lots of them living in your body. In fact, an
average human body contains about thirty tillin human cells, and around
thirty-nine trillion bacteria cells.
Josh: Seriously Oh, this is making my stomach turn.
Jenny: Speaking of which, most of the bacteria in your body help with digestion.
And they help make the food that goes into your stomach, too. Without
bacteria, we wouldn’t be able to make cheese, yoghurt, vinegar...
Checking background knowledge
Adding information
Josh: Really I didn’t know that!
Jenny: Oh, and bacteria are also useful at the other end of the food production
process. They have an important role dealing with your waste and that of
other organisms.
Josh: Euw! You mean what goes down the toilet
Jenny: Yes. Bacteria break down this waster and other dead, organic matter, like
fallen leaves, into nutrients.
Josh: Oh I get it. And these nutrients go back into the soil where they can be used
by plants!
Jenny: That’s it exactly.
Josh: All right. Although some of the bacteria may cause diseases in humans,
plants and animals, they aren’t all bad...
Read the passage and answer the questions.
8
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. The toughest species is probably the water bear. This tiny
organism can survive temperatures from 150 °C to a below freezing 272°C. To best survive in their environment, each species has developed its own unique physical characteristics.
Each year, scientists identify around 15,000 new species.
However, diversity on our planet is such, that there are
still millions of species on Earth remaining to be
discovered.
1 What species are mentioned and what is special about them
2 What other unusual life forms do you know of
Complete the paragraphs with the correct form of the
words and expressions in the box.
9
is home to
scientific
are native to
habitats
ecosystem
appearance
primitive
ancestor
Work in pairs.
Look at the pictures of the species native to different regions of China.
Talk about biodiversity in China using the words and expressions in this section.
Do online research to find more information.
Speaking
Now talk about what methods you used to collect the information pare your methods with your partner’s and think about which methods are more efficient.
Thank you!