课件33张PPT。Module III Unit 4AstronomyWhat’s the meaning of the word “Astronomy”?I. Warming up
the science of stars;
the scientific study of stars and planets.2. What words will you think of when we talk about this topic? star, planet, the sun / moon / earth, solar system 恒星 行星 太阳 月球 地球 太阳系 3. How many planets are in the solar
system?
8PlutoScientists now think Pluto is
too small to be called a planet.4. Do you know the correct order of their distance to the sun? nearest to
the sun? farthest to
the sun?5. The names of eight planets.Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune1) 水星
2) 金星
3) 地球
4) 火星
5) 木星
6) 土星
7) 天王星
8) 海王星Mercury Venus Earth Mars Jupiter Uranus Saturn Neptune6. Put them in correct order on P25.Do you know their origin?II. Pre-readingHave you ever asked your mother, “Mom, where do I come from”?2. Nearly everybody has this or that puzzles:
How do human beings come into being?
How does the earth come into being?3. In China, there are two legends about these puzzles. Do you know the names?盘古开天辟地 女娲补天造人 4. In the western culture, who creates everything in the world?The GodIII. Fast-readingDo you believe in such stories? Are they based on science?2. In this unit, we’ll learn something more scientific.
3. What’s the title of the text?4. From the title, we can predict that the text may tell us the origin of life on the earth.How life began on the earth5. Which question are you interested in in this text?1) How old is the earth?
2) How does the universe begin?
3) Is there any water in the Mars?
4) When did dinosaurs disappear?
5) Which animal is the most important one on the earth?6. Do you know which paragraph you can find out the answer?Para.4Para.2Para.3Para.5Para.17. Conclude the main idea of each paragraph.
1) A widely ______ about the _____ of the universe.
2) The formation of the ______.
3) The __________ of water for life.
4) The development of ______ and _______ on the earth.
5) The arrival of _______ and their _____ on the earth.
The text mainly tells us the _________ of the
earth and the ___________ of life on it.
8. The main idea of Reading1.Ex.1 on P27
theoryoriginearthimportanceplantsanimalshumansinfluence
/ effectformationdevelopment Detailed reading
This text can mainly divided into two stages
Stage 1 : The development of the earth
Stage 2 : The development of life
(para 1—3)(para 4—5)Stage 1: The development of the earth(1) After the Big Bang, what was the earth like? a cloud of dust a solid globe exploded with fire and rock produced water
vapour and gases(2) What happened next?(3) What did the water vapour and gases
form?the earth’s atmosphere Water appeared(4) What appeared as the earth cooled down?water is important for the beginning of life on the earth. Why is water so important for the beginning of life?
Because water allowed the earth to dissolve harmful gases into oceans and seas.?Stage2 The development of life small plants appears in water 1.What life developed after water appeared?Shellfish and all sorts of fish 2.What life developed in water next? green plants began to grow on land insects appeared3.What about the life on land?amphibians on land and in the waterforests4. What life developed next on land? reptiles appeared dinosaur developed 5.What life developed after forests
appeared?mammals on land6.What life developed after dinosaurs? small clever animals7. What life developed after mammals? 1.Who are the small clever animals with hands and feet?
2. Are they taking care of the earth well? Why?
? Because they are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.The earth may become too hot to live on .Can you fill in the blanks?234
567
8
9
101 small plants in watershellfish and all
sorts of fish insects reptilesamphibiansmammalsdinosaurs humansplantsanimalsGreen plants on landforestsCan you put the order of development of life into a time line?1. Insects and amphibians appeared.
3. The earth became a solid ball.
5. Reptiles appeared.
7. The earth was a cloud of dust
9. Shellfish and other fish appeared.
11. Clever animals with hands and feet appeared2. Dinosaurs appeared.
4.Small plants grew on the water.
6. Plants began to grow on dry land.
8. Water appeared on the earth
10. The universe began with a “Big Band”.
12. Mammals appeared.831091151741262Ex.2 on P27
How life began on earth is one of the biggest puzzles that scientists found hard to solve.
What other puzzles are hidden in the passage?DiscussionEx.5 on P27
How does the universe(earth) form?
Why did the earth cool down?
Why did water disappear on other planet?
How did the dinosaur disappear ?summaryAfter the “big bang”, the earth was still just a cloud of _______,it _______loudly with fire and rock, which were _____ to produce the_________, water vapour and other gases. Then ________ began to appeared on the earth. dustexplodedin timecarbonwater ____________ in water are considered to be the earliest lives on the earth. The O2they supplied encouraged the lives of______________. Slowly green plants grew on land, which were followed by __________like insects & ________. When the plants grew into______, ______ appeared. Then _______ developed but disappeared later, which made the rise of a totally different animal,______, possible, and finally _____ spread all over the world.shell--fish and fishamphibiansforestsreptilesdinosaursmammalhumansThe small plantsland animalsHomework:
1. Finish the exercise 1and 2 on page 63
2. Read the text again and find out your difficult points.