牛津译林版英语九年级下册Unit 4 Welcome to the unit（视频嵌入）(共23张PPT)

Unit 4 Life on Mars 译林版九年级下册 英语 Welcome to the unit Do you know the place in the picture? It’s Earth, our home. The earth is covered with water, so it looks blue. + Our home too many people too much pollution What shall we do? Where shall we live? Do you know anything about Mars? It looks red. So it is also called the Red Planet. Mars /mɑːz/ n. 火星 Mars is the fourth planet of the solar system and is named after Mars (战神). Mars goes around the sun at a distance of about 228 million k . You can tell which planet is Mars because it is bright r in the night sky. The gravity(重力) on Mars is about three-e of that on earth. The t on Mars is between -138 ℃ and 28℃. It t a spaceship about eight months to reach Mars from the earth. Scientists are still s for more information about Mars. ilometers ed ighths emperature akes earching What is life like in space ? less gravity /ˈɡrævəti/ n.重力