《We have not found life on any other planets yet》journey to space PPT课件2

Revision

Scientists have sent spaceship to Mars. The journey has taken several months. 

Astronauts have already been to the moon.

No one has been to Mars yet, because Mars is very far away, much farther than the moon.

Lots of scientists are working hard in order to send astronauts to Mars one day.

... ... ...

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 

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.

... ... ...

Language points

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 the sun is only one of them.

银河系中有数十亿颗恒星，太阳只是其中的一个。

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

然而，我们还没有在任何其他行星上发现生命。

yet用于否定句和疑问句，意思是“还，尚”。not … yet的意思是“还没，尚未”，表示某事物在某一时间尚未发生，但未来也许会发生。例如：

I haven’t learnt any farther information yet. 

我还没有得到进一步的信息。

Have you received her letter yet?

你收到她的来信了吗？

3. The earth is a planet and it goes around the sun. Seven other planets also go around the sun.

地球是颗行星，它围绕着太阳转。此外还有七颗行星也围绕着太阳转。

太阳系的其他七颗行星：水星 

(Mercury)、金星(Venus)、火星

(Mars)、木星(Jupiter)、土星(Saturn)、

天王星(Uranus)、海王星(Neptune)。

... ... ...

What have the scientists just received?

(a message from one of our spaceships)

They have just received a message from one of our spaceships.

1. Where has the spaceship landed? (Mars)

It has landed on Mars. 

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

It has discovered people on Mars.

3. Why have the people on Mars not sent us a message? (do not know how to)

We do not know how to send us a message.

4. Why have the people on Mars not visited us on the earth? (do not know how to)

We do not know how to visit us on the earth. 

... ... ...

1. — Where’s Mr Green?    

— He _____ to Changsha. (2013湖南湘西)

A. have been

B. has gone

C. has been

2. — Is Tom at home? 

— No, he______ to town. (2013天津) 

A. has been         B. has gone     

C. goes               D. will go 

3. He promised to pick me up at the school gate. However, he _____ yet.  (2011安徽)

A. didn’t arrive  B. doesn’t arrive        

C. isn’t arriving     D. hasn’t arrived

... ... ...

《We have not found life on any other planets yet》journey to space PPT课件3 Astronauts have already been to the moon. Scientists have sent spaceship to Mars. The journey..

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