高一英语必修三Unit-4Unit-4说课稿

1、高一英语必修三 Unit 4Unit 4 Astronomy : the scienee of the star Reading说课稿课 题： Reading: How Life Began on the EarthI教学内容分析本单元的中心话题是 天文学。本课是一篇表达性文体，按照时间顺序主要表达了地球上生命的起源和开展过程。可以说科学知识含量较高，更能激发学生的学习兴趣和好奇 心。Pre-read ing 局部也提出了三个问题，主要是让学生区分宗教信仰、文化传统和科学思 想之间的不同。可以以讲故事的方式让学生彼此之间分享一些有关宇宙和地球起源方面的传 说或故事，这样既能激活他们的思维也能为

2、阅读局部打下根底。Read ing局部描写了地球上生命的起源和开展过程，具体写了由于水的形成才使得地球上生命的诞生成为可能。科学家认为，地球上的生命最初诞生于水中。数万年后，陆地上才长出了绿色植物，随后出现了陆栖动物和水陆两栖动物。最初的动物靠孵化繁衍后代，再之后诞生了哺乳动物，人类也随之诞生了。文章最后讲述的现象发人深省：The earth maybecome too hot for the lives on it.它关系到地球上生命的未来。II.教学重点和难点1 .教学重点1本单元的生词、短语和句型结构；2丨掌握主语从句并把它和表语从句进行区别；3丨学会运用科学知识并能结合自己的想象力去解

3、决现实中的问题。2 .教学难点1通过学习相应的科学知识培养学生的创造性思维能力；2丨学生应能够理解主语从句的用法和作用并能做到学以致用，举一反三。III.教学步骤:Step 1 Revisio nPurpose :Let the stude nts have a clear aware ness of the text.Revise the new words and phrases by a dictati on.Ask ing questi ons:How many pla nets are there in solar system?What are they?Step 2. Fast

4、read ingPurpose: To get the list of the passage.To correctly un dersta nd some in formatio n give n in the text.1. Ask Ss to read the text quickly and try to get the main idea of the text. Suggested An swer:The main idea of the text is the titleHow life bega n on the earth.2. Ask Ss to work in pairs

5、 and discuss the questi ons of Ex1 on P27. And then let them check the answers in pairs.Step 3. I nten sive readi ngPurpose: to get the stude nts to lear n the details of the text. An swer the questi ons:? When did the“ Big Bang happen? What form was the earth the“ Big Bang ？? What made up the earth

6、' s atmosphere after the earth exploded? How did water come into being on the earth? What was importa nt to the developme nt of fish? What made possible the rise of mammals on the earth? Why are mammals different from all life forms in the past?2Fill in the chart about the order of development o

7、f life.Suggested An swers: Small plants in water Shellfish and all sorts of fish Greenpla nts on land Insects(on land) Amphibians(on land and in water)forests reptiles(on land) dinosaurs(on land) mammals(on land) human beingsStep 3 Expla nati onPurpose:Help Ss an alyze some difficult, lo ng and comp

8、lex senten cesand guess the mea nings of the new words.Ask the stude ntsto un derl ine the difficult senten ces and an alyze them and take no tes.Pick out all the useful expressi ons and copy them.Step 4 Read aloudAsk Ss to read the passage aloud after the tape and let them pay more atte nti on to t

9、he pronun ciati ons of each new senten ce.Step 5 HomeworkPreview the n ext period.a nd recite the last three paragragh.Unit 4 How Life Began On The EarthDifficult Ian guage pointsMain idea of each paragraph:1 a widely accepted theory about the formati on of the uni verse2 the formati on of the earth