I 教學內容分析

　　本單元的中心話題是“天文學”。本單元的兩篇文章都采用了敘述性文體。第一篇閱讀短文按照時間順序主要敘述了地球上生命的起源和發展過程。第二篇閱讀短文中作者用第一人稱的口吻講述了他和朋友的登月經歷?？梢哉f本單元科學知識含量較高，更能激發學生的學習興趣和好奇心。

　　Warming Up 部分共有兩個問題,第一個問題讓學生說出八大行星并看圖指出各個行星的名稱；第二個問題讓學生說出自己對天文學哪些方面感興趣以及天文學家所關注的方面。在高考的重壓之下，同學們都想能利用科學的學習方法做到事半功倍而且很多學生也一直做著將來能成為科學家的夢。所以，該話題會讓學生們興趣盎然，積極思考和討論此方面的內容，從而達到熱身的目的。

　　Pre-reading 部分也提出了三個問題，主要是讓學生區分宗教信仰、文化傳統和科學思想之間的不同?？梢砸灾v故事的方式讓學生彼此之間分享一些有關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分打下基礎。

　　Reading 部分描寫了地球上生命的起源和發展過程，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家認為，地球上的生命最初誕生于水中。數萬年后，陸地上才長出了綠色植物，隨后出現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。文章最后講述的現象發人深省：The earth may become too hot for the lives on it.它關系到地球上生命的未來。

　　Comprehending 部分通過五個練習題檢測學生對本文核心內容的理解。練習1是對文章結構的分析以及大意的概括；練習2通過排序的方式幫助學生弄清本文的行文線索，也就是地球上生命的起源和發展歷程；練習3提出5個小問題，考查學生的深層理解和推斷能力；練習4讓學生找出文章中出現的連接詞，檢查學生對文章中句型的熟悉和理解程度，同時還有助于學生在寫作方面得到提高；練習5讓學生選擇一個問題進行回答并向全班匯報，開拓學生的思維并鍛煉他們的語言表達能力。。

　　Learning about Language 有詞匯和語法兩部分。第一部分練習讓學生學著去應用課文中出現的詞語。第二部分是針對主語從句的練習，其中第一題要求學生從課文中找出三個或更多的主語從句；第二個練習以把主語從句改寫成簡單句的形式讓學生能對此語法有深層的了解。第三個練習則以完成句子的方式要求學生更進一步的運用復合句，此部分是對表語從句進行練習。

　　Using Language包括“聽力”、“閱讀”、“說和寫”三大塊。這三部分的話題都是有關科學的。聽力部分主要是介紹三位偉大的科學家。閱讀部分講了一個科幻故事。說和寫的中心話題是登月旅行中必需的工具和可能遇到的問題。該部分的設計由淺入深，層層遞進，既練習了聽力又豐富了知識，還能夠鍛煉同學們的想象力，拓展學生各方面能力。

　　Summing Up 指導學生歸納和總結在本單元學到的知識——有用詞匯、慣用表達和語法結構。

II．教學重點和難點

1． 教學重點

　　（1）本單元的生詞、短語和句型結構；

　　（2）掌握主語從句并把它和表語從句進行區別；

　?。?）學會運用科學知識并能結合自己的想象力去解決現實中的問題。

2．教學難點

　?。?）通過學習相應的.科學知識培養學生的創造性思維能力；

　?。?）學生應能夠理解主語從句的用法和作用并能做到學以致用，舉一反三。

III．教學計劃

本單元建議分為六課時：

　　第一課時：Warming Up, Talking (Workbook) & Listening（Workbook）

　　第二課時：Pre-reading, Reading & Comprehension

　　第三課時：Learning about Language

　　第四課時：Using Language

　　第五課時：Reading task & Speaking task (Workbook)

　　第六課時：Listening task & Writing task (Workbook)

IV. 教學步驟：

Period 1

　　Warming Up, Listening（Workbook）& Talking (Workbook)

　　Teaching Goals:

　　1. To arouse Ss’ interest in the knowledge of astronomy and science。.

　　2. To develop Ss’ ability in listening and speaking.

　　Teaching Procedures:

　　Step 1. Leading- in

　　Give Ss a few minutes to say something about science by asking the following questions.

　?。?.）Who is the first man in space，do you know？

　?。?.）Which spaceship did Yang Liwei take to space？

　?。?.）Do you want to go to space if you are given a chance?

　　Step 2. Warming Up

　　Purpose: To introduce the topic of this unit to Ss in the form of asking questions and discussion.

　　Ask some Ss the questions first and then get Ss to discuss with each other. If time permits, have one or two groups present their answers to the whole class.

　　(1) How many subjects are we studying now?

　?。?）Do you have some scientific studying methods to learn them well?

　　(3) As you see, a large number of students want to become scientists in the future. But what kind of qualities and skills do we need to be real scientists?

　　Step 3. Talking (Workbook)

　　1. Divide Ss into six groups, and ask them to talk about the request of Talking on P62 and answer the following questions. Different students will give different answers. Make notes of some valuable information and make a conclusion at last.

　　(1) What necessary instructions should new space travelers make?

　　(2) Can you make a list of them?

　　2. Show Ss some beautiful pictures of the university and say, “Now look at the pictures. How beautiful the Universe is! It is also full of mysteries. Have you ever dreamed of flying to the space like Yang Liwei to unlock the mysteries of the universe? If you could, what things should you pay attention to?”

　　3. Encourage Ss to give as much information as possible. After the discussion, write down some key words and important expressions on the blackboard to help Ss to have the sense of traveling in space .

　　Conclusion:

　　Before making a trip into space, we’d better make full preparations, such as : collecting as much information about the space as possible; checking whether you have got the proper spacesuits or not; making sure of all the safety rules; not leaving the spaceship alone unless the space guide tells you to; paying attention to recording some important time during the space traveling and so on.

　　Step 3. Listening (Workbook)

　　Purpose: To develop Ss’ listening ability.

　　To gain some experience of traveling in space

　　1. Get Ss to look through the exercises before giving them the listening material. At the same time remind them of the new and key words: astronaut, experience, instruments, pilot, air force, rocket.

　　2. Ask Ss to look through the questions of the first part and listen to the tape carefully. Play the tape twice. For the first time, just ask Ss to listen for the gist. For the second time, ask Ss to prepare to do the exercises. If time permits, play again in order to give the class a chance to check or complete their exercises.