初中英语外研版 (新标准)八年级下册Unit 2 We have not found life on any other planets yet教学设计

Module 3 Journey to space

Unit 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 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 night

II. Careful reading. Read again, check （√）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 universe.        (     ) 

III. Complete the passage with the words and expression in the box.

communicate    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, 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 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 scientists 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，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? It’s  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. 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 teacher’s office. You can find her there.

A. has been to  B. has gone to  C. has left  D. went

2. I ______to Canada It’s so beautiful.

A. won’t go  B. have gone  C. don’t go  D. have  been

3. --Has Dave come _______?

–-Yes, she has _______been here for 10 minutes.

A. yet, already  B. already, yet  C. already, already  D. yet, yet

4. ______your help , I finished the work easily.

A. With  B. Without  C. Under  D. Below

5. It’s 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.