必修4 Unit4 Astronomy 教案

Teaching Aims: 教学目标
1. Target language
a> Important words and expressions
名词： astronomy atmosphere system oxygen surface planet
动词： explode multiply prevent depend
形容词：violent solid harmful
b> 短语： solar system in time prevent….. from depend on
c> Important sentences:
1>.It exploded loudly with fire and rock, which were in time to produce the water vapour, carbon dioxide, oxygen., nitrogen and other gases, which were to make the earth’s atmosphere.
2>.Whether life will continue to the earth for millions of years to come will depend on whether this problem can be solved.
2. Ability aims: 能力目标
a> Let the students learn the sequence of life’s origins and process
3. Moral aims: 道德情感目标
a> Enable the students know the importance of pretecting our environment., our earth
4. Teaching important points:
a> Teach the students how to read an article and how to retell a passage
b> Let the students have an environment awareness
5. Teaching difficult points:
Teach the students how to enjoy an article
6 Teaching methods:
a> Fast reading, careful reading
b> Reading and practicing
7 Teaching aids:
A slide projector
Teaching procedures and ways Greeting ( be omitted)
Step Ⅰ Revision
Check the homework with the whole class
StepⅡ Show the students some pictures of universe, the earth’s atmosphere, the solar system
And ask them some questions.
Q: 1> Can you imagine how the universe began
2> How the earth began
3> How the life begin on the earth
T: Your answers are very interesting. Now, I’m going to tell you some legends about the origin of universe and life.( Pangu separates the sky from the earth) ( Nuwa makes men)
T: Do you think all these legends reasonable and interesting Now, if you want to get a comparative scientific idea about how to life began on the earth, please look at your books at P25. Read this passage quickly and answer the questions on the screen.
1> How did water come into being on the earth
Suggested answer: The explosion of the earth produced water vapour, which turned into water when the earth cooled down.
2> What is the significance of the presence of water on the earth
Suggested answer: It allowed the earth to dissolve harmful gases into oceans and seas.
Step Ⅲ Careful reading
Now, it is time for us to read the text carefully. But before reading, you should have a look at this diagram, This diagram may help you get some information quickly and easily, and then find out some noun clauses as the subject. Now look at the screen.
Important sentences:
1> What it was to become was a mystery until the dust began to slowly combine into a ball moving around the sun.
2> What scientists think is that the earth was different because of the arrival of small plants growing in the water on its surface.
3>
Step Ⅳ Ask the students retell the passage according to the diagram.
One possible version:
The explosion of the earth produced water vapour, it became water when the earth cooled down, so it allowed the earth to dislove some harmful gases, this encourage the development of life in the oceans and seas. The plants in the oceans and seas produced oxygen to help the development of early shellfish and sorts of fish. Many millions of years later the first group of plants appeared on the land, and then appeared land animals, such as insects, amphibians, reptiles, dinosaurs and mammals including human beings.
Step Ⅴ The use of knowledge
Make watch wonder be cool multiply begin exist explode
Where do we come from How did the universe ________ When we _________ the stars through the telescope, we _________ why the universe __________ . After the “ Big Bang” , the earth __________ just a cloud of energetic dust. Somehow it __________ loudly with fire and rock, which __________ the earth’s atmosphere. As the earth __________ down, water ________ to appear on its surface, which was important for the beginning of life. Then living things ________on the earth..
Step Ⅵ Homework P26 No 1 P27 No2
课后信息反馈：
两个有关生命起源的传奇故事引起学生的极大兴趣。调动学生想了解地球上生命起源的欲望，使接下来的课文理解达到了预期的目的。但要求学生依据以上图表复述课文没能顺利展开，要学生在短时间内脱离课本复述课文有一定的难度，以后应加强这一方面的训练。
Early shellfish and sorts of fish
Plants in the sea
Land plants
Land animals
Insects
Amphibians
Reptiles
Dinosaurs
Mammals including human being
Harmful gases
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