1、編輯pptRevisionTextbook P.29. (2-3)編輯ppt Ex.2.1.What he discovered hasnt yet been proved.2.Whether the other astronomers accept his ideas remains a question.3.How life first appeared on earth is still a mystery to scientists.4.Why the earth is becoming warmer is an important topic for research.5.It am

2、azed that everybody that stephen Hawking at 65 expericed .6.It is a surprise that Pluto is no longer considered a planet in our solar system.編輯ppt. What is gravity? Give an example. Everything will fall back to the earth if it is dropped or thrown away. The pull of the earth is called gravity。編輯pptI

3、saac Newton Albert Einstein Stehpen HawkingWhat do they have in common?Who got the idea of gravity first?How? The law of gravityThe theory of relativity black holes編輯ppt Listen and fill in the chart. Isaac NewtonIdea_ bodies have a force which _ things towards them.Development The _ the object the _

4、the gravity.Largepullsbiggerstrongere.g. The earth is circling around the sun.編輯pptReading A visit to the moon編輯pptFast reading 1.How many times did the force of gravity change on their journey? Three times.編輯ppt Read the passage and write down three ways in which gravity and weight changed for Li Y

5、anping. The way gravity and weight changed Left the earthIn spaceOn the moon The gravity became very_. .The gravity_. It became very_. His weight is_. He is_. He weights _than on earth.strongnormaldisappearedweightless.light.lessZero gravity編輯ppt Discussion: How do you understand “ Leaving the moons

6、 gravity was not as painful as leaving the earths. But returning to the earth was very frightening” ? That is because the gravity of the moon is less than that of the earth and thus it is not painful.編輯ppt 1. a visit to the moon = the jouney pay a visit to sp. = visit sp. (n.) (vt.) call at sp. = dr

7、op in at sp.拜訪某地拜訪某地 編輯ppt 4.explain sth to sb. = explain to sb sth explain to sb that 向某人解釋向某人解釋 5. the force of gravity 重力重力 7. be off 離開離開;動身動身 I must be off now.編輯ppt 2. have a chance to do sth take / catch a chance 抓住機會抓住機會 miss / lose a chance 失去機會失去機會 3.make a trip into space 作一次太空旅行作一次太空旅行 s

8、end up into space 把把送入太空送入太空 carry up into space編輯ppt 8.escape the pull of the earths gravity 9.fall to the ground 落到地上落到地上 10. When we get closer to the moon, we shall feel its gravity pulling us, but it will not be as strong a pull as the earths. get /become /be close to 靠近靠近 feel sb doing sth A i

9、s (not) as +adj. + a + n. as BHe is not as / so good a boy as Tom.編輯ppt 11. cheer (sb.) up （使）感到高興（使）感到高興 12. float weightlessly around 飄來飄去飄來飄去 13.climb down the steps 14.step forward 向前邁步向前邁步 15. But when I tried to step forward I found I was carried twice as far as on the earth and fell over.而當我試

10、著向前邁而當我試著向前邁步的時候，我發覺我被送出去很遠，步子步的時候，我發覺我被送出去很遠，步子的跨度竟是地球上的兩倍，因而我摔倒了。的跨度竟是地球上的兩倍，因而我摔倒了。 英語常見倍數的表示句型：英語常見倍數的表示句型：編輯ppt1). 倍數倍數+ as + adj./adv. + as “是是的幾倍的幾倍” My room is twice as large as his.2). 倍數倍數+ adj./adv.比較級比較級+ than “比比(多多/大大)幾倍幾倍”My room is twice larger than his. 3). 倍數倍數+ the +表示長度表示長度/高度高度/

11、寬度等的名詞寬度等的名詞+ of “是是的長度的長度/高度高度/寬度幾倍寬度幾倍” My room is twice the size of his. 編輯ppt注意：此結構中常用的名詞有：注意：此結構中常用的名詞有：size, height, weight, length, width depth等。例如：等。例如：練習練習 完成句子或翻譯。完成句子或翻譯。這把尺子是那把的三倍那么長。這把尺子是那把的三倍那么長。This ruler is three times as long as that one. = This ruler is twice longer than that one.=

12、 This ruler is three times the length of that one.編輯ppt 16. twice as far as 17. fall over 18. Walking does need a bit of pratice now that gravity has changed. 19. get the hang of 20. We watched, (feeling) amazed as fire broke out on the outside of the spaceship as the earths gravity increased.編輯ppt

13、Last month I visited the moon with my friend. Before we left, I was told the force of g_ would change three times on our journey. Then we took off. As we left the earth, the force was p_. Gradually the weight l_. When I was in space, it d_. We f_ weightlessly in the cabin and I c_ _. When I was on t

14、he moon, I was surprised to find out even walking needs lots of practice n_ _ gravity changed. The returning of the earth was very f_. We were amazed to watch fire b_ _ on the outside of the ship. ravity owerfulessened isappearedfloated heered upnow that rightening reak out編輯pptHomework 1.背單詞背單詞 / 詞組詞組2.練習卷練習卷 4 編輯ppt 1