高中英语人教版必修三Unit4 Astronomy：the science of the stars Reading课件（68张）

课件68张PPT。人教课标
高一 必修 3 Unit 4Unit 4 Astronomy the science of the starsReadingHOW LIFE BEGAN ON THE EARTHWarming upWhat are the names of the eight
planets that circle our sun?海王星
Neptune水星
Mercury 金星
Venus 地球
Earth 火星
Mars 木星
Jupiter 土星
Saturn天王星
Uranus A Quiz Game 1. How old is the earth?
A. About 3.5 billion years
B. About 4.5 billion years
C. About 5.5 billion years
D. About 6.5 billion years
2. ______ of the earth surface is covered
by water.
A. 20% B. 30% C. 50% D. 70%3. How many planets are there in the Solar System?
A. 6 B. 7 C. 8 D. 9
4. What is the total population of humans on the earth?
A. About 3.5 billion B. About 4.5 billion
C. About 5.5 billion D. About 6.5 billion5. How long does the rotation (自转) of the
earth take?
A. 12 hours B. 24 hours C. a month D. 365 days
6. Which continent is the smallest?
A. Africa B. North America
C. South America D. Oceania
7. On what day is the Earth day celebrated?
A. April 22 B. May 4
C. August 21 D. November 118. Which ocean is the largest?
A. The Pacific Ocean
B. The Arctic Ocean
C. The Indian Ocean
D. The Atlantic Ocean
9. Which country has the largest area?
A. Canada B. China
C. Russia D. U.S.APrediction Look at the picture. Do you know the topic of this unit?海洋里的细胞开始分裂 登陆爬行动物恐龙Mammals人类的兴起Do you know what it was like before life appeared on earth?可以演化成低级生命的小液滴水泡状的太空原始生命体It was full of water.1. What do we mean when we say we are studying a subject scientifically? Or what’s the correct attitude towards science?
We should be objective, not superstitious.Answer these questions.2. What’s the correct way to prove a scientific idea?
We should design experiments to test it for several times.
Then we can analyze the results and draw a conclusion at last.3. What are the most important skills we need to be real scientists?
Careful, objective and logical, draw conclusions from the experiments and not impose conclusions on the data.
(impose … on … 把……强加于……)1. The origin of life on earth is a question that interests astronomers. What do you know about it?
How old is the universe? (several billion years ago)
How old is the Earth? (between 4.5 and 3.8 million years ago)
Which were the first creatures or plants on Earth?...Pre-reading2. Each religion and culture has its own ideas about how life began on earth. What do you know?
In China, we all know that Pangu separates the sky from the earth and Nvwa made humans.Pangu separates the sky from the earth. 中国神话传说中有盘古开天地的说法。巨人盘古用一把利斧劈开混沌, 将天地分开。死后, 他的气息化成风和云, 声音变成轰轰的雷声, 左眼化为太阳, 右眼化为月亮, 手足与四肢变成大地的四极与五方的名山, 血液化成江河, 筋脉铺成道路, 肌肉形成田地, 须发成为星星, 牙齿和骨骼化为金属、珍珠、玉石, 汗水成为滋润万物生长的甘霖和雨露。Nvwa made humans.Other legends about the beginning of universe.The Biblical AccountDay 1: God spoke and separated light from darkness creating Day and Night.
Day 2: God spoke and separated the water creating sky and ocean.
Day 3: God spoke and created dry land. Day 4: God spoke and created the sun, moon and stars.
Day 5: God spoke and created living creatures in the air and sea.
Day 6: God spoke and created the land animals and man.
Day 7: God rested and blessed this day calling it Holy. India
Brahma is the god first represented in the Hindu Triad. He is the creator of the universe and all living beings are said to have evolved from him.▲ Big BangGasNew starsDying starsremnants平面图 太阳系地球大气1. When did the “Big Bang” happen?
It happened several billion years ago.Scanning Read the passage quickly and answer the questions.2. What form was the earth after the “Big Bang”?
The earth was still just a cloud of dust.
3. What made up the earth’s atmosphere after the earth exploded?
Carbon, nitrogen, water vapour and other gases. 4. How did water come into being on the earth?
As the earth cooled down after it exploded, water came into being.5. What’s the significance of the presence of water on the earth?
It allowed the earth to dissolve harmful gases and acids into the oceans and seas.6. What was important to the development of fish?
oxygen.
7. What made possible the rise of
mammals on the earth?
The disappearance of dinosaurs made the possible the rise of mammals on the earth.8. Why are mammals different from all
life forms in the past?
They gave birth to young baby animals and produced milk to feed them.Careful readingI. Read the passage carefully and match the main idea with each paragraph. Para. 1 The formation (形成) of the
earth.
Para. 2 The importance of water for
life.
Para. 3 A widely accepted theory
about the formation of the
universe.
Para. 4 The arrival of humans and
their impact on the earth.
Para. 5 The development of plants
and animals on the earth.II. Answer the following questions.1. Why was the earth different from other planets?
The water remained.
2. Why did the plants grow before the animals came?
Because plants provide oxygen for animals to breathe. 3. Why is it wrong in films and stories to show dinosaurs and people together?
Because dinosaurs died out long before human beings developed on the earth.4. Why do you think that humans are the cleverest animals on the earth?
They are the cleverest animals because they have larger brains than any other creature on the earth so far.5. There used to be nine planets in the solar system. Recently scientists have decided that one of them can no longer be considered a planet. Do you know the name of that planet? Do you know why they removed it?
Pluto. Scientists now think it is too small to be called a planet. 6. What problem is caused by human beings?
They cause global warming. III. Fill in the blanks in the following form.AtomsviolentatmospherepresenceacidsoxygenshellfishamphibiansReptilesexistedgave birth tocleverdioxideIV. True (T) or False (F).
1. The earth appeared before the Big Bang happened.
2. The original atmosphere consisted of nitrogen and oxygen.
3. The main difference between the earth and other planets is that there is water on the earth.
4. Life began in water and then on land.FFTT5. Mammals appeared before the development of dinosaurs.
6. Dinosaurs could give birth to young baby animals and produced milk to feed them.
7. Human beings produce too much carbon dioxide which causes the global warming on the earth.
8. According to the text, human beings would disappear in the end. FFTFHow life began on the earth.“Big Bang”other bodies_______ starsEarth: a cloud of _____atomsdustSummary a solid ______the earth’s ___________other
_____Water: ___________ to the development of lifewater vapour nitrogen carbonextremely small _______ on the
surface of the waterglobegasesatmospherefundamentalplantsearly _________ and all sorts of fishgreen plants on landland animalsinsectsamphibians________huge animals
(dinosaurs)the rise of __________human beingsshellfishreptilesmammalsWe have only one earth!!!Speaking What should we do for our earth?You can use the following words or phrases to help you:prevent … from … harmful
global warming carbon dioxide
in turn depend on as a result thus atmosphereWhat should we do for our earth?Let’s take part in the activities to save the earth!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? Find them out and do some research.DiscussionThank you!