人教版高中英語必修3課件-Unit-4-Astronomy-the-science-of-the-stars-課件1

1、Unit 4 Astronomy: the science of the starsUnit 4 Warming upmedicinebiology chemistry astronomy physics mathematicsWarming upmedicine geophysicsgeology physics biochemistry biology chemistrygeophysicsbiochemistry Astronomy is the scientific study of the universe and the heaven bodies (such as the sun

2、, the moon, and stars), gas, and dust within it. astronomerAstronomy is the scientific stSolar systemSolar system1.Do you know how did the universe begin?1.Do you know how did the univEach religion or culture has its own ideas about the beginning of the universe?Pre-readingPangu separates the sky fr

3、om the earth.Each religion or culture has iPangu separates the sky from the earthPangu separates the sky from t Pangu separated the earth and sky with an ax. After he died, his breath became wind and cloud; his voice became thunder and his left eye sun and right one moon; arms and legs became edges

4、and mountains; blood became rivers and tendon (筋脈) became roads; muscles became fields and hair stars; teeth and bones became metals, pearls and jade; sweat became rain. Pangu separated the earth Reading How Life Began on the EarthReading How Life Began on theDo you know the origin of the human bein

5、gs ?Do you know the origin of the Man had evolved from apes. Man had evolved from apes. EarthHow life began on the earthEarthHow life began on the earThe Big Bang The Big Bang waterPlants in the waterShellfish and fishPlants on landwaterPlants in the waterShellfInsects and amphibiansReptiles Dinosau

6、rs Mammals Insects and amphibiansReptileswatergreen plants on land234How life began on the earthAnalysing 5678forestsshellfish and all sorts of fishinsects (on land)amphibians (on land and in water)reptiles (on land)dinosaurs (on land)mammals (on land) small clever animals with hands and feet human

7、small plants in water1watergreen plants on land23HowA cloud of dustCombine into a solid ballExplodewith fire & rock(produce H2O, CO2,O2, N2, other gases) atmosphereCool downwater appeared dissolve harmful gases into Life beganLife developedA cloud of dustatmosphereCool The development of lifeThe dev

8、elopment of lifeScanning1. What was produced when the earth exploded?2. How did water come into being on the earth?3. Where did life first begin, on the land or in the sea? 4. Why were mammals different from other animals?Scanning1. What was produced w1. What was produced when the earth exploded?Wat

9、er vapour , carbon dioxide, oxygen, nitrogen and other gases.2. How did water come into being on the earth?The explosion of the earth produced water vapor, which turned into water when the earth cooled down.1. What was produced when the 3. Where did life first begin, on the land or in the sea?In the

10、 sea. Because water dissolved harmful gases and made it possible for life to begin.4. Why were mammals different from other animals?Because they produced their young from within their bodies.3. Where did life first begin,Careful Reading Finish the comprehending on page 27Careful Reading Think about

11、what you have read and make choices.Why was the earth different from other planets?A it produced a lot of heat. B.The water remained.C Water disappeared. D.It was the oldest planet.Why was life able to develop on the earth but not on other planets?A The earth had a solid shape. B. The earth did not

12、have harmful gases in its atmosphere.C The water stayed on the earth but not on other planets. D.The earth was not too hot and not too cold.Think about what you have readWhy was it necessary for plants to grow before animals?A Animals needed plants to protect them from the sun. B Plants provided oxy

13、gen for animals to breathe.C Animals could hide from hunters in forest.D It was easier for plants to grow.What problem is caused by human being?A They exist everywhere on the earth.B They cause global warming.C They find new methods of growing crops.D They enjoy hunting and fishing.Why was it necess

14、ary for plantText Retelling The explosion of the earth produced_ _, which turned into water when the earth cooled down. Water allowed the earth to _ harmful gases into the oceans and seas. That made it possible for _ to begin to develop. The arrival of small _ encouraged the development of early _ a

15、nd all sorts of fish. Many millions of years later the first green plants began to appear on land. watervapourdissolvelifeplantsshellfishText Retelling The explosioLater land animals appeared. Some were_. Others, called_, were able to live on land as well as in the sea. When the plants grew into for

16、ests, _appeared for the first time. Then _developed, which became the most important animals on the earth for millions of years. After they disappeared, _ became more important. Text RetellinginsectsamphibiansreptilesdinosaursmammalsLater land animals appeared. SThey were the last group of animals a

17、nd they were different because they _ their young from within their bodies. Small clever animals, with hands and feet, _ and _ all over the earth. As time went by, they covered the earth and have become the most important animals on the planet.Text RetellingproducedappearedspreadThey were the last g

18、roup of anLanguage pointsLanguage points1. It exploded loudly with fire and rock, which were in time to produce the water vapour, 1). （使某物）炸開，爆炸 2). （指感情）激發(fā) 3). （指人口）突然或迅速增加 The firework exploded in his hand and he was hurt seriously. I was frightened when she exploded into loud laughter. Now it is

19、not easy to find jobs with the exploding population. explosion n. 爆炸（聲） explosive adj.爆炸性的，易爆炸的 n.炸藥，爆炸物 1. It exploded loudly with fir2. Nobody knew that it was going to be different from other planets going round the sun. be very / much / quite / entirely / totally different from與不同 City life is q

20、uite different from country life. 1）城市生活和農村生活很不同。2）他們的品位和我不同。Their tastes are different from mine. There are differences betweenand 與之間有不同之處tellfrom 把與區(qū)分開來the same as 與一樣be similar to 與相似 2. Nobody knew that it was goi3. It allows the earth to dissolve harmful gases, which allow vt. 允許、許可、容許allow+n.

21、/pron./doing allow sb. to do be allowed to doMy father doesnt allow smoking at home. In fact he doesnt allow us to smoke anywhere at any time.父親不允許在家里吸煙。實際上，他不允許我們在任何地方任何時候吸煙。Are we allowed to use the computer?我們可以用電腦么？3. It allows the earth to diss4. This encouraged the development of early shellfi

22、sh and all sorts of fish.encourage 鼓舞；促進；慫恿。后接名詞、代詞，也可接不定式作賓語補足語。如：High prices for corn and wheat will encourage farming.玉米和小麥的高價將促進農業(yè)的發(fā)展。My success encouraged me to continue.我的成功鼓勵我繼續(xù)干下去。He encouraged me to learn dancing.他鼓勵我去學跳舞。4. This encouraged the develop5. Many millions of years later the fir

23、st green plants began to appear on land. late adj. 遲到的，晚的；前任的；以前的；已故的 later adv. 后來，較晚時候,過后 adj. late的比較級(更遲的,更后的) latest adj. 最新的 lately adv. =recently 近來 1) Mr. Zhu Rongji is the late Prime Minister of China. 3) She said she would ring you later this morning. 5) Its only lately that she has been w

24、ell enough to go out. 2) He is often late for school. 4) Have you heard about the latest news? 5. Many millions of years late6. Small clever animals, now with hands and feet, appeared and spread all over the earth. vi. 散布, 傳播，蔓延, 伸展，擴展 vt. 鋪開，攤開 1) The news spread through the school very quickly. 2)

25、 Theres a desert spreading for hundreds of miles. 3) He spread out his arms to welcome us. 4) I spread a new cloth on the table. 6. Small clever animals, now w7. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. 阻止某人做某事 :prevent sb. (from) doing sth. stop sb. (from) doing sth. keep sb. from doing sth. 1) We must prevent them from making trouble. 2) You should prevent the child from injuring himself. If nothing prevents, 如果沒有什么阻礙的話 , 7. They are putting too much c8. Whether life will continue on the earth for