人教高中英语必修3Unit4-reading(共33张)课件.pptx--（课件中不含音视频）

1、ReadingHOW LIFE BEGAN ON THE EARTHWarming upWhat are the names of the eight planets that circle our sun?A Quiz Game 1.How old is the earth?A.About 3.5 billion years B.About 4.5 billion years C.About 5.5 billion years D.About 6.5 billion years 2._ of the earth surface is covered by water.A.20%B.30%C.

2、50%D.70%3.How many planets are there in the Solar System?A.6 B.7 C.8 D.9 4.What is the total population of humans on the earth?A.About 3.5 billion B.About 4.5 billion C.About 5.5 billion D.About 6.5 billion5.How long does the rotation(自转自转)of the earth take?A.12 hours B.24 hours C.a month D.365 days

3、6.Which continent is the smallest?A.Africa B.North America C.South America D.Oceania 7.On what day is the Earth day celebrated?A.April 22 B.May 4 C.August 21 D.November 118.Which ocean is the largest?A.The Pacific Ocean B.The Arctic Ocean C.The Indian Ocean D.The Atlantic Ocean9.Which country has th

4、e largest area?A.Canada B.China C.Russia D.U.S.APrediction Look at the picture.Do you know the topic of this unit?1.The origin of life on earth is a question that interests astronomers.What do you know about it?How old is the universe?(several billion years ago)How old is the Earth?(between 4.5 and

5、3.8 million years ago)Which were the first creatures or plants on Earth?.Pre-readingPre-reading2.Each religion and culture has its own ideas about how life began on earth.What do you know?In China,we all know that Pangu separates the sky from the earth and Nvwa made humans.Pangu separates the sky fr

6、om the earth.The Biblical AccountThe Biblical AccountDay 1:God spoke and separated light from darkness creating Day and Night.Day 2:God spoke and separated the water creating sky and ocean.Day 3:God spoke and created dry land.Day 4:God spoke and created the sun,moon and stars.Day 5:God spoke and cre

7、ated living creatures in the air and sea.Day 6:God spoke and created the land animals and man.Day 7:God rested and blessed this day calling it Holy.1.When did the“Big Bang”happen?It happened several billion years ago.Scanning Scanning Read the passage quickly and answer the questions.2.What form was

8、 the earth after the“Big Bang”?The earth was still just a cloud of dust.3.What made up the earths atmosphere after the earth exploded?Carbon,nitrogen,water vapour and other gases.4.How did water come into being on the earth?As the earth cooled down after it exploded,water came into being.5.Whats the

9、 significance of the presence of water on the earth?It allowed the earth to dissolve harmful gases and acids into the oceans and seas.6.What was important to the development of fish?oxygen.7.What made possible the rise of mammals on the earth?The disappearance of dinosaurs made the possible the rise

10、 of mammals on the earth.8.Why are mammals different from all life forms in the past?They gave birth to young baby animals and produced milk to feed them.Careful readingI.Read the passage carefully and match the main idea with each paragraph.Para.1 The formation(形成形成)of the earth.Para.2 The importan

11、ce of water for life.Para.3 A widely accepted theory about the formation of the universe.Para.4 The arrival of humans and their impact on the earth.Para.5 The development of plants and animals on the earth.II.II.AnswerAnswer the followingthe following questions.questions.1.Why was the earth differen

12、t from other planets?The water remained.2.Why did the plants grow before the animals came?Because plants provide oxygen for animals to breathe.3.Why is it wrong in films and stories to show dinosaurs and people together?Because dinosaurs died out long before human beings developed on the earth.4.Why

13、 do you think that humans are the cleverest animals on the earth?They are the cleverest animals because they have larger brains than any other creature on the earth so far.5.There used to be nine planets in the solar system.Recently scientists have decided that one of them can no longer be considere

14、d a planet.Do you know the name of that planet?Do you know why they removed it?Pluto.Scientists now think it is too small to be called a planet.6.What problem is caused by human beings?They cause global warming.IV.True(T)or False(F).1.The earth appeared before the Big Bang happened.2.The original at

15、mosphere consisted of nitrogen and oxygen.3.The main difference between the earth and other planets is that there is water on the earth.4.Life began in water and then on land.FFTTSpeaking What should we do for our earth?You can use the following words or phrases to help you:prevent from harmful global warming carbon dioxide in turn depend on as a result thus atmosphereLets take part in the activities to save the earth!How life began on earth is one of the biggest puzzles that scientists found hard to solve.What other puzzles are hidden in the passage?Find them out and do some research.