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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。