高中英语 unit 4　astronomy the science of the stars period 1学案 新人教版必修3

Unit 4Astronomy:the science of the starsPeriod 1文本研读课学习目标1.Understand the theory about the origin of the universe and life on the earththe “Big Bang” theory.2.Learn to concern about the future of life on the earth.思考导引How the universe began.课堂探究1.SkimmingWhat is the main idea of the text?2.Scanning Which paragraphs are the questions mentioned in?(1)How old is the earth?(2)How does the universe begin?(3)Is there any water in the Mars?(4)When did dinosaurs disappear?(5)Which animal is the most important one on the earth?3.Intensive readingTask 1 Read the passage carefully and analyse its structure.Main BodyTask 2 Put the order of development of life into a timeline.()1Insects and amphibians appeared.()2Dinosaurs appeared.()3The earth became a solid ball.()4Small plants grew on the water.()5Reptiles appeared.()6Plants began to grow on dry land.()7The earth was a cloud of dust.()8Water appeared on the earth.()9Shellfish and other fish appeared.()10The universe began with a “Big Bang”.()11Clever animals with hands and feet appeared.()12Mammals appeared.Task 3 After reading the passage,discuss the following questions.1.Why was the earth different from the other planets?2.Why is it wrong to show films with dinosaurs and people together?3.What problem is caused by human beings?课堂提升SummaryAfter the “Big Bang”,the earth was still just a cloud of .It loudly with fire and rock,which were to produce ,nitrogen,water vapour and other gases.Then began to appear on its surface. which grew on the water are considered to be the earliest lives on the earth.The oxygen they supplied encouraged the lives of .Slowly green plants grew on land,which were followed by like insects and .When the plants grew into , appeared.Then developed but disappeared later,which made the rise of a totally different kind of animal,possible,and finally spread all over the world.Discussion 1.Do we human beings look after the earth well?What problems have been caused by human beings to the earth?2.As a student,what little things can we do for the earth?Design an activity on Earth Day.What the activity is about Why the activity is designedWhen and where to do the activity Who takes part in the activityWhat to be done in the activity.课后作业1.Search the Internet for the information of the development of life.2.Read the text again and find out your difficult points.参考答案课堂探究1.SkimmingHow life began on the earth.2.Scanning(1)Para.2(2)Para.1(3)Para.3(4)Para.4(5)Para.53.Intensive readingTask 1Main BodyTask 28,10,3,5,9,7,2,4,6,1,12,11Task 31.Because the water remained on the earth.2.Because dinosaurs died out long before human beings developed on the earth.3.Human beings cause global warming.课堂提升Summarydust;exploded;in time;