高一英语必修三Unit 4Unit 4说课稿

1、高1英语必备3单元4单元4 astronomy:the science of the star reading演讲主题：reading : how life began on the earthI教学内容分析这个单元的中心主题是“天文学”。本课以叙述的文体，按年代顺序主要叙述了地球上生命的起源和发展过程。科学知识的含量高，可以进一步激发学生的学习兴趣和好奇心。预读部分也提出了三个问题，主要是让学生区分宗教信仰、文化传统和科学思想的差异。通过讲故事，学生可以徐璐分享有关宇宙和地球起源的传说或故事，从而激活他们的思维，为阅读部分打下基础。Reading部分描述了地球上生命的起源和发展过程，特别是水

2、的形成使地球上生命的诞生成为可能。科学家们认为地球的生命最初是在水中诞生的。几万年后，陆地上出现了绿色植物，接着出现了陆地动物和水陆两栖动物。第一种动物孵化并繁殖后代，然后哺乳动物诞生，人类也随之诞生。文章的最后一个故事激励人心：the earth may become too hot for the lives on it。它与地球上生命的未来有关。二.教育优先事项和困难1.教育重点(1)本单元的新词、短语和文章结构；(2)掌握主语，区别于谓语。(3)学会运用科学知识，结合自己的想象力，解决现实的问题。(。2.教育难点(1)学习相应的科学知识，培养学生的创造性思维能力。(2)学生必须理解和学

3、习主语的用法和作用，以便应用。三.授课阶段：Step 1 Revisionpurpose : let the students have a clear awareness of the text。revise the new words and phrases by a dictation。Asking questions:how many planets are there in solar system？What are they？Step 2 .Fast readingpurpose : to get the list of the passage。to correctly under

4、stand some information given in the text。1.ask ss to read the text quickly and try to get the main idea of the text .Suggested Answer:the main idea of the text is the title-how life began on the earth .2.ask ss to work in pairs and discuss the questions of ex1 on p27。and then let them check the answ

5、ers in pairs .Step 3 .Intensive readingpurpose : to get the students to learn the details of the text .(1) Answer the questions:When did the“Big Bang”happen？What form was the earth the big bang ？what made up the earth s at mosphere after the earth exploded？how did water come into being on the earth？

6、what was important to the development of fish？what made possible the rise of mammals on the earth？why are mammals different from all life forms in the past？(2)fill in the chart about the order of development of life。Suggested Answers:small plants in watershell fish and all sorts of fishgreen plants

7、on landinsects(on land)in amphibians(on land in water)forestsreptiles(on land)dinosaurs(on land)mammals(on land)human beingsStep 3 Explanationpurpose : helpss analyze some difficult，long and complex sentences and guess the meanings of the new words。ask the students to underline the difficult sentenc

8、es and analyze them and take notes .pick out all the useful expressions and copy them。Step 4 Read aloudask ss to read the passage aloud after the tape and let them pay more attention to the pronunciations of each new sentence .Step 5 Homeworkpreview the next period . and recite the last three paragragh。Unit 4 How Life Began On The EarthDifficult language pointsMain idea of each paragraph:1a widely accepted theory about the formation of the universe2 the formation of the earth3