外研版英语8年级下m3Unit2.ppt

* * earth moon spaceship astronaut space travel 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. Look at the picture and talk about what you know about Chinese spaceships. Shenzhou-9 is a manned spaceship. 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 √ 1. The earth is a star. 2. The sun is a star. 3. There is more than one galaxy in the universe. Check (√) the true sentences. × √ √ 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. √ × × Complete the passage with the words and expression in the box. communicate environment none solar system universe 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. solar system none environment 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. communicate universe 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