初二下册M3Unit2 We have not found life on any other planets yet.U2..ppt

Let’s have a trip to space! 1.Scientists ______________many other galaxies in the universe. 2.Scientists _____________spaceships to the planet Mars to take photos.They have even sent spaceships to travel outside the solar system. No spaceships ____________far enough to reach other stars in our galaxy. 2. Scientists _________________life on any other planets yet. 1. None of them has an environment like that of the earth, so scientists do not think they will find life on them. that是指示代词,可用 that 或 those 来代替前面已提到过的人或事物； The air in the countryside is fresher than _________in the city. The streets in the city are wider and the buildings are taller than ________ in the county. * Warm up: What are they? Where are they from? Are they from outer space? aliens. superman 1.Shenzhou-9 is a manned(载人的） spaceship. 2.It can send messages to the earth. By spaceship Fast reading :Choose the best title of our trip. Anyone out there? Life on Earth Our solar system The stars at night Careful reading-----Para One 1.How long has there been life on the earth? 2.Have we found life on any other planets yet? There has been life on the earth for hundreds of millions of years. No, we haven’t. galaxy planet solar system star universe 太阳 Para 2:Match the words with the pictures the Sun the Earth Mars the solar system 200 billion stars It’s a part of the universe(宇宙). Para 2: Which one is larger? The Galaxy or solar system? Para 3,4,5: a.What have scientists done about the space ? have sent have discovered Para 3,4,5: b. What haven’t they done about the space? has travelled haven’t found Work in Pairs----Check the true sentences 1. The Earth is a star. 2. The Sun is a star. 3. There is more than one galaxy. 4. The light from stars has taken a long way to reach us. 5. Scientists have received many messages from space. 8. Spaceships have visited most of the universe. a planet. haven’t haven’t 1.成百万年 2.在其它的行星上 3.绕太阳