Unit 4　Astronomy:the science of the stars

Period 1　文本研读课

学习目标

　　1.Understand the theory about the origin of the universe and life on the earth-the "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.Skimming

　　What 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 reading

　　Task 1 Read the passage carefully and analyse its structure.

　　Main Body├ ■(▭(Paragraph1":" )@■(Paragraph2":" @Paragraph3":" @Paragraph4":" )@▭(Paragraph5":" ))┤

　　Task 2 Put the order of development of life into a timeline.

　　(　　)1　Insects and amphibians appeared.

　　(　　)2　Dinosaurs appeared.

　　(　　)3　The earth became a solid ball.

　　(　　)4　Small plants grew on the water.

　　(　　)5　Reptiles appeared.

　　(　　)6　Plants began to grow on dry land.

　　(　　)7　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　Mammals appeared.