《Unit4Astronomythescienceofstars》由会员分享，可在线阅读，更多相关《Unit4Astronomythescienceofstars（23页珍藏版）》请在金锄头文库上搜索。
1、Unit4AstronomythescienUnit4AstronomythescienceofstarsceofstarsThe Milky Way galaxy水星水星 金星金星地球地球火星火星木星木星土星土星天王星天王星海王星海王星 Didanasteroid（小行星）（小行星）killthedinosaursandcouldanotherkillus?1. All living things depend on _ for life.2. As far as we can see, the _ is the only planet suitable for life to develo
2、p. Its about _years old.3. The sun is about _ the size of the earth.4. _ is what makes life possible.5. Where did life first begin? On the land or in the ocean?6. Which appear first? Plants or animals? 7. How many planets are there in the Solar System? A. 6 B. 7 C. 8 D. 98. On what day is the Earth
3、Day celebrated? A. April 22 B. May 4 C. August 21 D. November 11the sunthe sunFree TalkearthearthWater494.5billionHow did life begin on earth?How did life begin on earth?In Chinese culture:Pangu separated the sky and the earth;Nvwa made human beings with clay(黏土).How did life begin on earth?How did
4、life begin on earth?In Indian culture:Brahman(婆罗门 )is the creator of the universe and all living beings are said to have evolved from him.How did life begin on earth?How did life begin on earth?In Western culture:God created the world in 7 days.On the 6th day, he created humans:AdamandEve All began
5、with a “Big Bang ”(大爆炸大爆炸)How did life begin on earth?How did life begin on earth?According to a widely accepted theory,ReadingHOW LIFE BEGAN ON THE EARTHuniverseformationearthformationimportancewaterdevelopmentplantsanimalshumansarrivalinfluenceDevelopment of lifeDevelopment of earth- which makes i
6、t possible for life to develop- which makes it possible for life to developDevelopment of earth:Development of life:P4-5 1. Afterwaterappeared_appearedonthesurfaceofthewater,whichencouragedthedevelopmentof_smallplantsshellfishandallsortsoffish2. Next, _ began to grow on land as well as land animals-
7、insects and _, which can live both on land and in the water.greenplantsamphibians3. Later, when plants grew into forests, _ appeared for the first time. Some huge animals, called _, developed, they produced young by laying eggs.reptilesdinosaursAbout 65 million years ago, dinosaurs disappeared, afte
8、r that, _ became more important. mammalscameintobeingandspreadallovertheworld.Whatlifedevelopedaftermammals? HumansThey developed new methods of growing food, hunting and moving around.As time went by they covered the earth and have become the most important animals on the planet.They are making the
9、 world better.They are making the world worse.ABDiscussionAs a student, what little things can we do for the earth?topreventtheearthfromgettinghotterandhottertoslowdowntheproblemgettingworse solar energy plant trees recycle rubbish prevent desertificationsave water purify airWhat can we do take care of the earth?Man has but one earth!To save the earth is to save man himself!Homework1.Collect more information about the development of life and make a poster with your group members.2. Read and retell the passage to learn the important and difficult language points.结束结束
