外研版八年級英語下冊《We have not found life on any other planets yet》journey to space PPT教學(xué)課件，共44頁。
Review
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.
Presentation
Scientists think that there has been life on the Earth for hundreds of millions of years. However, we have not found life on any other plants yet.
Seven other planets also go around the sun. None of them has an environment like that of the earth, so scientists do not think they will find life on them.
The sun and its planets are called the solar system, and our solar system is a small part of a much larger group of stars and planets, called the Galaxy or the Milky Way.
Work in pairs
Look at the picture and talk about what you know about Chinese spaceships.
Shenzhou-9 is a manned spaceship.
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.
科學(xué)家認(rèn)為地球上的生命已經(jīng)有億萬年了。
millions of 數(shù)百萬 hundreds of 數(shù)百 thousands of 成千上萬 billions of 數(shù)十億
2. However, we have not found life on any other planets yet.
然而，我們還沒有在任何其他行星上發(fā)現(xiàn)生命。
3. None of them has an environment like that of the earth, so scientists do not think they will find life on them.
他們中沒有一個有像地球這樣的環(huán)境，因此科學(xué)家們認(rèn)為在他們上面找不到生命。
none of … 表示（三個以上）一個也沒有。做主語時，謂語動詞可用單數(shù)或復(fù)數(shù)。
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