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优秀课件ppt

设计说明

     本单元通过头脑风暴，激发学生的学习兴趣，增强学生对于太空领域的了解。通过任务设置教学阅读课，培养学生通过细节获取信息的能力以及把握文章主旨大意的能力；通过写作训练，使学生学会如何写描述太空的相关文章。

教学目标

通过本单元的教学，让学生达成以下目标

1.知识目标：

    掌握本单元新单词及短语：none, environment, that, solar, system, group, galaxy, universe, light, impossible, out, communicate, solar system

2.能力目标：

读懂以太空为话题的简单文章并能识别细节，并完成相关话题的写作任务

3.情感目标：

通过读写训练，能够了解中国在太空探索领域取得的伟大成就，增强民族意识和民族自豪感

重点难点

重点：相关阅读技巧的培养

难点：读写训练，以读促写，并完成相关话题的写作任务

教学准备

PPT 课件,图片、学案等

授课时数

2课时

教学过程

Step 1 Warming up

1.Brain storming: Let students think them over and discuss in groups:

How many planets are there in the solar system? What are they?

Is there any life on other planets?

2. Ask the students to have a discussion and think them over. Then, the teacher shows students the pictures of eight planets.

3.Tell students some background information of people’s effort to land on the moon home and abroad.

Step 2  Pre-reading

Ask students to work in pairs to talk about Shenzhou-9—a man-made spaceship.

What do you know about it？

Step 3  Fast-reading

Read the passage and choose the best title for it.

1.Anyone out there?  2. Life on the earth

3. The sun and other stars  4. The stars at night

Answer: 1

Step 4  Careful reading

Para 1:Ask students to read and answer the questions.

(1) How many years do the scientists think there has been life on the earth?

(2) Have we discovered life on other planets?

Answers: (1) For hundreds of millions of years.

(2)  No, we haven’t.

Para 2: Ask students to read and match the words with pictures.

Then put the words in the box in order: small—large.

Paras 3-4：Ask students to read and complete the table.

Answers：

（1）discover many other galaxies  （2）send spaceships to

(3)take photos   （4）travel outside the solar system

（5）how large the universe is  （6）far enough to

Para 5:

Ask students to read and find out sentences with present perfect tense(现在完成时态).

1.Scientists have always asked the questions…

2. Have there been visitors to the earth from other planets?

3. Why has no one communicated with us?

Step 5  After reading

1  Ask students to listen and read. Check (√) the true sentences.

1.The earth is a star.

2. The sun is a star.

3. There is more than one galaxy in the universe.

4. The light from the stars in other galaxies has travelled for a long time to reach us.

5. Scientists have received many messages from space.

6. Spaceships have visited most of the universe.

Answers：1. ×  2. √   3. √   4. √   5. ×   6.×

Listen and read

2  Ask students to listen and read after the tape.

3  Ask students to read in groups.

4  Ask students to act out.

Step 6 Language points

1. However, we have not found life on any other planets yet.

但是，我们在其他星球上还没有发现生命。

other 形容词，意为“其他的”，用于修饰名词。

辨析：the other (s)与other (s）：

the other与other后可加名词; the others与others后不加名词；the other (s)表示一定范围内除去一部分以外后其余的全体；other (s)表示除去一部分以后的（一些）,但不是剩下的全体。

One flower is red, and the other (one) is white.

一朵花是红的，另一朵 (花)是白的。

Give me some other apples/others, please!请另给我一些（苹果）吧！

It is taller than many other buildings.它比许多其他的建筑物都高。

2. None of them has an environment like that of the earth.

它们中没有一个有像地球这样的环境。

辨析：no one与none：

no one的同义词为 nobody, 只用于指人，其后不跟of短语，作主语时谓语用单数，no one 只能回答who提问的问句。

none用于表示对三者或三者以上全部否定，既可指人，也可指物,常用于短语none of+名词复数/代词，表示 “……中没有一个”。作主语时，谓语可以是单数，也可以是复数; none的反义词是all, none可与of连用; 可以用来回答how many 或 how much提问的问句。

None of us are/is interested in the story.我们没有人对那个故事感兴趣。

None of the students in this class has been to England.

这个班没有一个学生去过英国。

—Who are you speaking to?你在跟谁讲话？

—No one. 没人。

—How many students are there in the room?房间里有多少个学生?

—None. 一个也没有。

3. ...with so many stars in the universe, are we alone...?

 ……宇宙中有这么多的恒星，我们是唯一的吗……？

辨析：alone与lonely

（1）alone既可作形容词，又可作副词,意为“单独的/地，独自的/地”，没有感情色彩。

 She is afraid of going out alone at night.晚上她害怕一个人出去。

(2) lonely形容词，意为“孤独的，寂寞的”，具有感情色彩。

 He lived alone after his wife left，so he was very lonely.

 他妻子离开后，他一个人生活，所以他很孤独。

Do you feel lonely when you are at home alone?

你自己一个人在家时感到孤独吗？

Step 7 Exercises

1. Ask students to read the phrases in the conversation and put them into Chinese.

1. hundreds of    2.millions of

3. find life       4. go around

5. none of…     6.billions of

7.in the universe  8.send spaceships to the planet Mars

9.far enough     10.communicate with…

2.Ask students to complete the passage with the words and expression in the box.(A4)

Is there life on other planets? There are seven other planets in our     1    ,

But   2    of them has a(n)    3     like that of the earth. Spaceships from the earth have done surveys of the other planets, but they have not found any life there. Why has no one from other planets tried to    4    with us? It is true that scientists have not discovered life on other planets in the    5     yet, but some scientists believe that they will find it some day.

Answers: 1. solar system  2. none  3. environment  4. communicate

5. universe 

Step 8 Writing

1.Let students look at the picture from a science story for children and answer the questions.(A5)

— What have the scientists just received?

— They’ve just received a message from one of our spaceships.

(1) Where has the spaceship landed? (Mars)

(2) What has the spaceship discovered? (people on Mars)

(3)Why have the people on Mars not sent us a message? (don’t know how to)

(4)Why have the people on Mars not visited us on the earth?(don’t know how to)

2. Let students write a passage to describe the picture. Tell them to use their answers to the questions in Activity 5 to help them.

We have just received a message from our spaceship to Mars…

Possible version:

We have just received a message from our spaceship to Mars. Our spaceship has discovered aliens there. They have never sent us a message because they don’t know how to communicate with us. They haven’t visited the earth because they don’t know how to fly to our planet, and they prefer life on Mars. They seem very happy on their planet. They have used parts from the other spacecraft from the earth to make TVs, radios, etc. We hope they don’t do the same with this one!

Step 9 Homework

1. Read the passage.

2. Ask students to correct their writing.

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