1、高一英語必修三Unit 4Unit 4 Astronomy：the science of the star Reading說課稿課 題：Reading: How Life Began on the Earth I 教學(xué)內(nèi)容分析 本單元的中心話題是“天文學(xué)”。本課是一篇敘述性文體,按照時間順序主要敘述了地球上生命的起源和發(fā)展過程?？梢哉f科學(xué)知識含量較高，更能激發(fā)學(xué)生的學(xué)習(xí)興趣和好奇心。 Pre-reading 部分也提出了三個問題，主要是讓學(xué)生區(qū)分宗教信仰、文化傳統(tǒng)和科學(xué)思想之間的不同?？梢砸灾v故事的方式讓學(xué)生彼此之間分享一些有關(guān)宇宙和地球起源方面的傳說或故事，這樣既能激活他們的思維也能為閱讀部

2、分打下基礎(chǔ)。Reading 部分描寫了地球上生命的起源和發(fā)展過程，具體寫了由于水的形成才使得地球上生命的誕生成為可能?？茖W(xué)家認為，地球上的生命最初誕生于水中。數(shù)萬年后，陸地上才長出了綠色植物，隨后出現(xiàn)了陸棲動物和水陸兩棲動物。最初的動物靠孵化繁衍后代， 再之后誕生了哺乳動物，人類也隨之誕生了。文章最后講述的現(xiàn)象發(fā)人深?。篢he earth may become too hot for the lives on it.它關(guān)系到地球上生命的未來。II教學(xué)重點和難點1教學(xué)重點（1）本單元的生詞、短語和句型結(jié)構(gòu)；（2）掌握主語從句并把它和表語從句進行區(qū)別；（3）學(xué)會運用科學(xué)知識并能結(jié)合自己的想象力去解

3、決現(xiàn)實中的問題。2教學(xué)難點（1）通過學(xué)習(xí)相應(yīng)的科學(xué)知識培養(yǎng)學(xué)生的創(chuàng)造性思維能力；（2）學(xué)生應(yīng)能夠理解主語從句的用法和作用并能做到學(xué)以致用，舉一反三。III. 教學(xué)步驟：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 readi

4、ngPurpose: To get the list of the passage. To correctly understand 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 discus

5、s the questions of Ex1 on P27. And then let them check the answers 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 earths atmosphere after t

6、he earth exploded?How did water come into being on the earth?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: Sma

7、ll plants in water Shellfish and all sorts of fish Green plants on land Insects(on land) Amphibians(on land and in water) forests reptiles(on land) dinosaurs(on land) mammals(on land) human beings Step 3 ExplanationPurpose:Help Ss analyze some difficult, long and complex sentences and guess the mean

8、ings of the new words. Ask the studentsto underline the difficult sentences 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:1 a widely accepted theory about the formation of the universe2 the formation of the earth3 the important of w