外研版八年级下册英语 Module 3 Unit 2 We have not found life on any other planets yet 教案.doc

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1、Module 3 Journey to spaceUnit 2 we have not found life on any other planets yet.学习目标：1.知识目标：掌握重点单词和词组的意思及用法2.能力目标：To write about space travel using present perfect tense.3.情感目标：通过本课的学习增加学生的天文知识，培养学生的民族意识。重点难点整体把握文章，理清文章思路。并能根据科学故事图片写短文。学习过程：课前延伸Read the new words before class.课内探究：（一）、情景导入： Work in

2、pairs. Look at the picture and talk about what you know about Chinese spaceships. （二）多层阅读:I. Fast reading. Read the passage and choose the best title for it. （）( ) 1. Anyone out there? ( ) 2. Life on earth( ) 3. The sun and the stars ( ) 4. The stars at nightII. Careful reading. Read again, check （）

3、the true sentences.The earth is a star. ( )The sun is a star. ( )There is more than one galaxy in the universe. ( ) The light from the stars in other galaxies has travelled for a long time to reach us. ( )Scientists have received many messages from space. ( )Spaceships have visited most of the unive

4、rse. ( ) III. Complete the passage with the words and expression in the municate doubt environment none solar system universe Is there life on other planets? There are eight planets in our _, but _ of them has a(n) _like that of the earth. Spaceships from the earth have done surveys of other planets

5、, but they have not found any life there. Why has no one from other planets tried to _ with us? It is true that scientists have not discovered life on other planets in the _ yet, but some scientists do not _ that they can find it some day.(三)、 精讲点拨：1. Scientists think that there has been life on the

6、 Earth for hundreds of millions of years. 科学家认为地球上的生命已经有亿万年了。 millions of 数百万 hundreds of 数百 thousands of 成千上万 billions of 数十亿e.g. There are billions of stars in the Galaxy, and our sun is only one of them. 银河系中有数十亿颗恒星，我们的太 阳只是其中的一个。2. None of them has an environment like that of the earth, so scien

7、tists do not think they will find life on them.他们中没有一个有像地球这样的环境，因 此科学家们认为在他们上面找不到生命。w none of 表示（三个以上）一个也没有。做主语时，谓语动词可用单数或复 数。e.g. None of us has/have been to the Mars. 我们中没一个去过火星。They are very far away and their light has to travel for many years to reach us. 它们离我们很遥远，它们的光必须要经过很多年才能到达地球。reach 为_ 动词

8、，后接宾语。arrive 为_ 动词，后接介词_构成动词短语。介词_ 后接大地方，介词_ 后接小地方。若后跟地点副词here, there, home等，介词省略。get 为_ 动词，和介词_ 连用后才可接宾语。若后跟地点副词here, there, home等，介词省略。4. So how large is the universe? Its impossible to imagine. 所以宇宙有多大？我们无从想象。句型: It is + 形容词 + to + 动词原形，意思是“做某事很”e.g. It is difficult to read these words. 读这些单词很难。5

9、. With so many stars in the universe, are we alone, or is there life out there in space? 宇宙中有这么多星球，我们是孤独的 吗？或者太空中还有其他生命存在呢？with + 名词 + 介词短语，表示伴随情况，意思是“带着”。 e.g. Mr. Zhang is coming with a book in his hands. 张老师手里带着一书进来了（四）：Test: 单项选择：1. She _the teachers office. You can find her there.A. has been to

10、 B. has gone to C. has left D. went2. I _to Canada Its so beautiful.A. wont go B. have gone C. dont go D. have been3. -Has Dave come _? -Yes, she has _been here for 10 minutes.A. yet, already B. already, yet C. already, already D. yet, yet4. _your help , I finished the work easily.A. With B. Without

11、 C. Under D. Below5. Its impossible _ how large is the Galaxy. A. imagine B. to imagine C. imagining D. imagined我是小小翻译家：1.地球是一颗行星，它围绕着太阳转动。The Earth is a planet and it _ _ the Sun.2. 我们还没有在其它行星上发现生命。We have not found life _ _ _ planets _.3.科学家们已经在宇宙中发现了许多其他星系。Scientists have discovered many other galaxies _ _ _.4. 太阳系只是我们星系的一小部分。The solar system is _ _ _ _ our Galaxy. 5.宇宙中有这么多的恒星，我们是孤独的吗？太空中还有其他生命吗？_ so many stars _ the universe, _ _ _ _, or _ _ life out there _ _?三、课后拓展：1. Read and write the phrases. 2. Preview Unit 3.