1、Unit 4Unit 4How 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.birdF.dog3.Which one belongs to amphibian(
2、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 structure.Write down the main ideafor each para
3、graph.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 and animals on the earthParagraph 5:The ar
4、rival 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.3.The earth was different from the othe
5、r 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)B.oxygen for animals to breathe C.neces
6、sary 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.About 2.6 million years ago some small clev
7、er 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 The earth became a solid ball.4 Small plan
8、ts 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 animals with hands and feet appeared.12 Mamma
9、ls 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 that humans are the cleverest animals on
10、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 you know the name of that planet?Do you k
11、now 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 result is that rises meltsThe reason is
12、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 ball exploded with fire and rock produc
13、ed 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 seas1.Big Bang(a huge explosion around 15
14、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 lifeThe development of lifearrival of small
15、 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?amphibians on land and in the waterforestsStage
16、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?Looking and thinking Look at the followi
17、ng 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 from apes.lowadvancedplantsanimals A few ki
18、ndsmany 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,after that,next,later,finally,thus,as a r
19、esult 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.
