人教新课标英语必修三课件 Unit 4 Astronomy：the science of the stars Reading 1课件(共23张PPT)

课件23张PPT。Reading
HOW LIFE BEGAN ON THE EARTHWarming upWhat are the names of the eight
planets that circle our sun?海王星
Neptune 水星
Mercury 金星
Venus 地球
Earth 火星
Mars 木星
Jupiter 土星
Saturn 天王星
Uranus Prediction Look at the picture. Do you know the
topic of this unit?海洋里的细胞(cell)开始分裂 登陆land on爬行动物reptile恐龙dinosaur哺乳动物mammals人类human beings Do you know what it was like before life appeared on earth?
It was full of water.1. What was there on the earth before life could begin?
Water vapour, carbon dioxide, oxygen, nitrogen and other gases.Scanning 2. Why do scientists think there has never been life on the moon?
Because there is no water on the moon.
3. Why did animals first appear in the seas?
Because water allowed the earth to dissolve harmful gases into the oceans and seas. 4. Why did green plants help life to develop?
Because green plants can take carbon dioxide from the atmosphere and fill the air with oxygen.ReadingI. Read the passage carefully and match the main idea with each paragraph. Para. 1 The formation(形成) of the
earth.
Para. 2 The importance of water for
life.
Para. 3 A widely accepted theory
about the formation of the
universe.
Para. 4 The arrival of humans and
their impact on the earth.
Para. 5 The development of plants
and animals on the earth.II. Read the text and fill in the blanks in the following form.AtomsviolentatmospherepresenceacidsoxygenshellfishamphibiansReptilesexistedgave birth tocleverdioxide