高二英语教案：实验版第3册Unit4教学资源

1、unit 4 astronomy: the science of the starspart 2: teaching resources(第二部分：教学资源 )section 1: a text structure analysis of how life began on the earth1. type of writing and summary of the texttype of writingthis is a descriptive writing.main idea of the passagetopic sentence of 1 st paragraphthe earth

2、came into being after the “ bigbang”then. small plants came growing in the water, followed by green plants appearing on land. in the end appeared small clever animals.after the “ big bang” ,the earth was just a cloud of energetic dust.topic sentence of 2 nd paragraphthe earth was different because o

3、f the arrival of smallplants growing in the water.topic sentence of 3 rdparagraphmany millions of years later the first green plants beganto appear on land.topic sentence of 4 thparagraphsmall clever animals appeared and spread all over theearth.2. a tree diagramafterthe“ big bang” ,theearthbeing ju

4、sta cloud ofenergetic dust.the arrivalofsmallplantswinginthewatergreen plantssmallcleverbeginningtoanimalsappearonappearingandlandspreadingallover the earth.第 1页共 3页section 2: background information for unit 4 astronomy:the science of the stars1. the planets行星although we live in a very small piece o

5、f the universe, its still where we call home and its a very interesting place. the nine planets that make up our solar system range from very tiny rocky planets to huge gas giants featuring fascinating ring systems.mercury水星mercury is the closest planet to the sun. its surface has many thousands of

6、impact craters as a result of being bombarded by objects since the solar systems early days. since mercury has no protective atmosphere, the temperature on the surface ranges from extremely hot on the side facing the sun to extremely cold on the side that faces away from the sun.venus 金星（太白星）venus i

7、s named after the roman goddess of love and beauty. this is one of those cases where beauty is only skin deep, though, as the surface of venus is a very unpleasant place featuring very high temperatures, winds that blow hundreds of miles per hour and an atmosphere of sulfuric acid. venus is an examp

8、le of runaway greenhouse effect on a planetary scale.earth地球people always say theres no place like home. our home planet is a very beautiful place with the most varied surface in the entire solar system. from a distance, our planet looks like a beautiful big blue marble.mars火星the red planet is named

9、 after the roman god of war. its distinctive rust color is easily seen through a small telescope. the surface of mars features many mountains, canyons and even polar ice caps that look a lot like those here on earth. in ancient times, mars may have harbored some kind of life, and there is a lot of r

10、esearch going on now trying to get a definitive answer as to whether we are the only life forms in the solar system.jupiter木星jupiter is the largest planet in our solar system. it has at least sixty-one moons and features the great red spot, which is a huge storm that has been observed from here on e

11、arth for over three hundred years.saturn土星saturn is one of the most beautiful planets in the solar system. its fascinating system of rings have been a source of wonder since we first saw them with the earliest telescopes. although the rings look fairly simple through a small telescope, spacecraft pi

12、ctures have revealed that what looks like two rings through a telescope is actually hundreds of individual ring systems. in addition, saturn has so many moons that it is like a miniature solar system.uranus 天王星uranus is one of the giant gas planets in the solar system. its mysterious blue-green colo

13、r provides very few clues as to what is going on underneath the surface clouds. uranus also has a very faint ring system that we didnt know existed until the planet was visited by the voyager spacecraft. neptune 海王星第 2页共 3页neptune was the last stop the voyager mission made before if left our solar s

14、ystem. what we found out from voyager was that neptune has winds that blow hundreds of miles per hour and a moon that features geysers of nitrogen that erupt and leave dark marks on the surface.pluto冥王星pluto is the smallest and most mysterious planet in our solar system. pluto is so far away that th

15、e sun is just a dim point of light that looks a lot like any other star. pluto has one moon, charon, that is almost as big as the planet itself.2. the big bang theory大爆炸理论the big bang theory is the dominant scientific theory about the origin of the universe. according to the big bang, the universe w

16、as created sometime between 10 billion and 20 billion years ago from a cosmic explosion that hurled matter and in all directions.in 1927, the belgian priest georges lemaire was the first to propose that theuniverse began with the explosion of a primeval atom.his proposal cameafter observing the red

17、shift in distant nebulas by astronomers to a model of the universe based on relativity. years later, edwin hubble found experimental evidence to help justify lemaires theory. he found that distant galaxies in every direction are going away from us with speeds proportionalto their distance.the big bang was initially suggested because it explains why distant galaxies are traveling away from us at great speeds. the theory also predicts the existence of cosmic background radiation (the glow left over from the explosion itself). the big bang theory received its strongest confirmation