1、Unit 4Unit 4Unit4 Astronomy the science of the starsHow Life Began on the EarthQuiz 1.Who wrote“The Origin of Species”(物种起源物种起源)?A.Newton B.Einstein C.Charles Darwin2.How many planets are there in the Solar System?A 7 B 8 C 9 4.Which one belongs to reptile(爬行动物）爬行动物）?A.frog B.snake C.duck D.fishE.bi
2、rdF.dog3.Which one belongs to amphibian(两栖动物两栖动物)?5.Which one belongs to mammal（哺乳动物）（哺乳动物）?ABF6.Which gas is the most important for life?A.carbon dioxide(CO2)B.oxygen(O2)C.nitrogen(N2)Read the passage quickly to find the main idea of each paragraph.Read the passage carefully and analyse its structu
3、re.Write down the main ideafor each paragraph.Paragraph 1:Paragraph 2:Paragraph 3:Paragraph 4:Paragraph 5:Paragraph 1:A widely accepted theory about the formation of the universeParagraph 2:The formation of the earthParagraph 3:The importance of water for lifeParagraph 4:The development of plants an
4、d animals on the earthParagraph 5:The arrival of humans and their impact on the earthSkimmingReading Comprehension I1.Who knows how life began on the earth exactly?A.Scientists.B.Astronomers.C.No one.D.Aliens(外星人外星人).2.What does“small clever animals”refer to?A.Insects.B.Reptiles.C.Dinosaurs.D.Humans
5、.3.The earth was different from the other planets in that_.A.a cloud of dust was around the earth B.comfortable climate remained on the earth C.water remained on the earth D.carbon remained on the earth 4.The plants grew before the animals because they provide_.A.nutrients for animals to absorb(吸收吸收
6、)B.oxygen for animals to breathe C.necessary temperature for animals to keep warm D.water vapour for animals5.Which of the following statements is true?A.The dust settled into a solid globe between 4.5 and 3.6 billion year ago.B.The first small plants began to appear on the surface of the land.C.Abo
7、ut 2.6 million years ago some small clever animals appeared and spread in the ocean.D.Dinosaurs died out long before human beings developed on the earth.Put the order of development of life intoa timeline.Use the reading passage to help you.1 Insects and amphibians appeared.2 Dinosaurs appeared.3 Th
8、e earth became a solid ball.4 Small plants grew on the water.5 Reptiles appeared.6 Plants began to grow on dry land.scanningReading Comprehension II7 The earth was a cloud of dust.8 Water appeared on the earth.9 Shellfish and other fish appeared.10 The universe began with a“Big Bang”.11 Clever anima
9、ls with hands and feet appeared.12 Mammals appeared.Answer:10 7 3 8 4 9 6 1 5 2 12 111.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.Reading and answer the following questions.2.Why do you think t
10、hat 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.3.There used to be nine planets in the solar system.Recently scientists have decided that one of them can no longer be considered a planet.Do y
11、ou 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.4.What problem is caused by human beings?the earth may become too .The result is that hotglobal warming-green house effect.It caused ice in the North Pole-water level-The
12、result is that rises meltsThe reason is that people are putting carbon dioxide into the atmosphere which the earth into space.prevents heat from escapingDetailed ReadingThe development of the earthStage 1:The development of the earth(1)After the Big Bang,what happened?a cloud of dust a violent solid
13、 ball exploded with fire and rock produced water vapour and gases(2)What happened next?(3)What did the water vapour and gases form?the earths atmosphereWater appeared which is important for the beginning of life on the earth.(4)What appeared on the earth then?(5)What did the water form?oceans and se
14、as1.Big Bang(a huge explosion around 15 billion years ago)2.a cloud of energetic dust3.a ball moving around the sun4.exploded with fire and rock5.produce the water vapour,carbon dioxideHow did the earth come into being?6.cooled down7.water appeared8.harmful gases were dissolvedThe development of lif
15、eThe development of lifearrival of small plants in water(1)What life developed after water appeared?early shellfishStage 2:The development of life in waterall sorts of fish(2)What life developed in water next?green plants on land insects on land(3)What life developed after the life in water?amphibia
16、ns on land and in the waterforestsStage 3:The development of life on land(1)What life developed next on land?reptiles on land dinosaurs on land(2)What life developed after forests appeared?mammals on land(3)What life developed after dinosaurs?small clever animals(4)What life developed after mammals?
17、Looking and thinking Look at the following pictures and try to understand more of the reading passage.A cloud of dustA solid globe Explode atmosphere waterCells separatePlants in the waterEarly shellfish and fishPlants on landoxygenInsects and amphibiansReptiles Dinosaurs Mammals Man had evolved fro
18、m apes.lowadvancedplantsanimals A few kindsmany kindswaterlandsimplecomplex 达尔文达尔文 进化论进化论Darwins theory of evolution The Origin of Species Something,somewhere went terribly wronglowadvancedlowDM:SC:Read the passage again and underlineall the discourse markers(DM)and sentence connectors(SC).however,a
19、fter that,next,later,finally,thus,as a result of thisand,but,because,orDesign an activity on Earth DayWhat is the activity is about?Why is the activity is designed?When and where is the activity?Who takes part in the activity?What is to be done in the activity?How can we protect the earth and make it a better place to live on?Homework1.Search the Internet for information of the development of life and find more solutions to global warming.2.Finish the exercises on page 28.
