外研社八下M3Unit2.ppt

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1、Unit 2 We havent found life on any other planets yet.the sunThe sun gives us light and heat.The sun is a star. (恒星）恒星）the earthThe earth doesnt give us light and heat.The earth is a planet. (行星）行星）Eight planets go around the Sun. 围绕围绕airwaterlightEarthenvironmentNone of them has an environment with

2、air, so people and things cannot grow.The sun and its planets are calledthe solar system. 太阳系太阳系被叫做被叫做200 billion stars in our galaxyMilky WayMany other galaxies in the universegalaxyplanetsolar systemuniversestarPut the words in correct order.planetsmallstaruniversegalaxysolar systemlarge1. Read th

3、e passage and choose the best title.a. Anyone out there?b. Life on earthc. Our solar systemd. The stars at nightHave we found life on other planets yet?1. The Earth is a star.2. The Sun is a star.3. There is more than one galaxy in the univer.4. The light from the stars in other galaxies has travell

4、ed for a long time to reach us.Read Pagraphy 13 and check () the true sentencesRead carefully and find details5. Scientists received many messages from space.6.Spaceships have visited most of the universe.Read Pagraphy 45 and check () the true sentences1. Scientists think that there has been life on

5、 the Earth for hundreds of millions of years. 科学家认为地球上的生命已经有亿万年 了。millions of 数百万 hundreds of 数百thousands of 成千上万 billions of 数十亿e.ge.g银河系中有数十亿颗恒星，我们的太银河系中有数十亿颗恒星，我们的太阳只是其中的阳只是其中的一个。.There are billions of stars in the Galaxy, and our sun is only one of them.2. However, we have not found life on any

6、other planets yet.而然，我们还没有在任何其他行星上而然，我们还没有在任何其他行星上发现生命。发现生命。4. None of them has an environment like that of the earth, so scientists do not think they will find life on them.他们中没有一个有像地球这样的环境，因此科学家们认为在他们上面找不到生命。none of 表示（三个以上）一个也没 有。做主语时，谓语动词可用单数或复 数。e.g. 我们中没一个去过火星。None of us has/have been to the M

7、ars.5. So how large is the universe? Its impossible to imagine.所以宇宙有多大？我们无从想象。句型: It is + 形容词 + to + 动词原形，意思是“做某事很”e.g. It is difficult to read these words. 读这些单词很难。6.With so many stars in the universe, are we alone, or is there life out there in space? 宇宙中有这么多星球，我们是孤独的吗？或者太空中还有其他生命存在呢？with + 名词 + 介

8、词短语，表示伴随情况，意思是“带着”。 e.g. 张老师手里带着一书进来了。alone 在句中作形容词，不作定语只做表语，也可作副词。意思是“独自地”。e.g. She was alone in that dark room.她独自一人呆在那黑屋子里。Mr. Zhang is coming with a book in his hands.1. on the earth=on Earth2. hundreds of/millions of 3. go around4. none of 5. be called6. a small part of7. much larger8. in the u

9、niverse9. enough to do10. be alone11.in space municate with1.在地球上在地球上2. 上百、上百万的上百、上百万的3.环绕环绕4. 没有一个没有一个(三者以上三者以上)5.被叫做被叫做6.中的一小部分中的一小部分7.更大更大8.在宇宙中在宇宙中9.足以做足以做10.独自的独自的11. 在太空中在太空中12.与与联系联系Complete the passage with the words and expression in the municate environment none solar system universeIs the

10、re life on other planets? There are seven other planets in our (1) _, but (2)_ of them has a(n) (3)_ like that of the earth. solar systemnoneenvironmentSpaceships from the earth have done surveys of the other planets, but they have not found any life there. Why has no one from other planets tried to (4) _with us? It is true that scientists have not discovered life on other planets in the (5)_ yet, but some scientists believe that they will find it some municateuniverse Goodbye!