資源簡介

(共18張PPT)
Lesson 2
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
How much do you know about air
What is air
What can air do
How much do you know about wind
What is wind What can wind do
How can we tell wind’s direction
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 the feature of a poem
—Rhymes [ra mz] 押韻
[e ]
[a ]
[a v]
Rules: It rhymes with the words at the end of the second and fourth line in the verse(詩節).
[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) Air is important. Are there any air pollution problems right now
Read and Think
(1) Why can clouds move
(2) What can tell us wind’s direction
(3) What do you know about wind energy
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. Read the instructions and focus on the “problems”.
2. Listen for questions (Wh-words) and key words.
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 logic between sentences while listening.
getting warmer
is disappearing
catch too many fish
eat plastic rubbish
die
are dying out
cause
effect
After you listen
Group discussion
(1) What is likely to be the next question
(2) As students, what can we do to protect the sea
...
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
評價 內容 1. 我能記錄海洋正在面臨的環境問題。 1 2 3 4 5
2. 我能理清句子間的因果邏輯關系。 1 2 3 4 5
3. 我能用已學的知識談論海洋環境問題。 1 2 3 4 5
4.我能理解空氣和風兩種自然現象。 1 2 3 4 5
5. 我能正確拼讀本節課學習的音標。 1 2 3 4 5
Homework
基礎作業
1. 模仿朗讀p.59 Improving your pronunciation 中的單詞和句子。
2. 寫一段話，回答問題“As students, what can we do to protect the sea ”，思考自己作為中學生可以如何保護海洋。
拓展作業
收集有關環保的中英文成語、俗語、名人名言等。

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