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(共29张PPT)
Unit 4
The Earth
Key question
Why should we learn about the Earth
What is it
It has no smell.
It has no taste.
But when the wind blows,
You feel it on your face.
It’s air.
Why do we need air
We need air to breathe /bri: /.
.
When air flows over a warm surface,
it heats up and rises.
This leaves room for cooler air to flow in.
The flowing air is _________.
What is it
wind
Discussion
What is air, and what do you know about it
What is wind What can it do
How can we tell the direction of the wind
Before you read
Air has no smell.
Air has no taste.
But when the wind blows,
You feel it on your face.
Look at that kite,
Or the plane over there.
How do they stay up
They ride on the air.
How does that balloon,
Float in the sky
Well, it’s simply hot air,
That makes balloons fly!
We need air to breathe.
We need air to survive.
And when we breathe it,
It keeps us alive.
—What is a common feature of poems Which can you see in this poem
—Rhymes /ra mz/ 押韵
/e /
/a /
/a v/
The second and fourth line of each verse(诗节) rhyme.
/e /
Read and appreciate
(1) How can you describe air
(2) What do the sentences “We need air to breathe. We need air to survive. ” mean
(3) Clean air is very important. Is there a lot of air pollution where you live
Read and Think
(1) Why can clouds move
(2) What thing(s) can we use to use to tell the direction of the wind
(3) What do you know about wind power
Read and Think
(1) Air has no __________ and no __________.
(2) A kite or a plane ______________ to stay in the sky.
(3)“We need air to survive” means “air _______ us _______”.
(4) The wind moves clouds across the sky, and sometimes
these clouds bring in __________.
(5) A(n) _____________can tell us where the wind is blowing
from.
(6) __________ produce electricity for us.
Comprehension exercise
smell
taste
rides on the air
keeps
alive
rain
weathercock
Windmills
Think and talk:
What do you know about the sea
How much of the Earth is covered by the sea
What is the biggest animal in the sea
Is there any sunshine at the bottom of the sea
How deep is the deepest part of the sea
How many big oceans are there on Earth
Before you listen
1 Only about ______ of the Earth is land.
a. 3/4 b. 1/4
2 Most of the water on Earth is in ______.
a. streams and rivers b. the sea
3 Whales ______ fish.
a. are b. are not
4 Sharks are ______.
a. small b. dangerous
5 ______ catch fish for people to eat.
a. Fishermen b. Farmers
6 Sea water usually tastes ______.
a. sweet b. salty
7 People ______ drink sea water.
a. can b. cannot
Quiz
Before you listen
coral reefs disappearing rising sea levels
plastic pollution overfishing
Prediction: What are likely to be mentioned
Get ready for the language
plastic pollution
coral reefs disappearing
rising sea levels
overfishing
While-listening
Tips: 1. Before you listen, read the instructions and the options carefully.
2. During the listening task, listen out for the options.
Listen to a quiz about the sea and tick the problems that the speakers mention.
coral reefs disappearing rising sea levels
plastic pollution overfishing
√
√
√
While-listening
Tip: Work out the connection between sentences.
getting warmer
is disappearing
catch too many fish
eat plastic rubbish
die
are dying out
After you listen
Group discussion
(1) What is likely to be the next question
(2) What can people do to protect the sea What can we as students do
...
Miss Liu: You’re right, Su Mei. We need to do
something about this. Now, the next question ...
Miss Liu: OK, now we are going to do a little quiz about the sea. Let’s start with the first question. Why are sea levels on our planet rising
Wu Di: I know! The sea is getting warmer because of global warming. A lot of the ice in the North and South Poles is disappearing. That makes the sea levels rise.
Miss Liu: That’s right, Wu Di. Now question number two. Many kinds of fish are dying out. Why is this
Li Na: Is it because people catch too many fish
Miss Liu: That’s correct. There is another reason too. Can anyone guess
Su Mei: Is it the plastic pollution I read that a huge amount of plastic rubbish ends up in the sea each year. Fish and other sea animals eat it and get ill. Sea animals also get caught in the plastic and die.
Miss Liu: You’re right, Su Mei. We need to do something about this. Now, the next question ... (fade out)
Audio script
Improve your pronunciation
Self-assessment
评价 内容 1. 我能记录海洋正在面临的环境问题。 1 2 3 4 5
2. 我能理清句子间的因果逻辑关系。 1 2 3 4 5
3. 我能用已学的知识谈论海洋环境问题。 1 2 3 4 5
4.我能理解空气和风两种自然现象。 1 2 3 4 5
5. 我能正确拼读本节课学习的音标。 1 2 3 4 5
Homework
基础作业
1. 模仿朗读课本第59页Improving your pronunciation 中的单词和句子。
2. 写一段话，回答问题“What can people do to protect the sea What can we as students do ”，思考自己作为中学生可以如何保护海洋。
拓展作业
收集有关环保的中英文成语、俗语、名人名言等。
smell /smel/ n. 气味
The smell of the flowers is sweet.
balloon /bR9lu:n/ n. 气球
A thousand balloons were released to mark the event.
alive /R9laIv/ adj. 活着的；在世的
They don’t know whether the soldier is still alive.
disappear /0dIsR'pIR(r)/ v. 消失；不见
Many kinds of birds are disappearing in the world.
plastic /9plCstIk/ n. 塑料
The pipes are made of plastic.
pollution /pR9lu:Sn/ n. 污染
Pollution can harm marine life.
plastic pollution 白色污染
What can we do right now to reduce plastic pollution
protect /prR'tekt/ v. 保护
We need to protect our amazing wildlife before it is too late.
global warming 全球变暖
die out 灭绝
a huge amount of 大量的
end up 结束；告终

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