Howlifebeganontheearth阅读课件公开课.ppt

How_life_began_on_the_earth_阅读课件(公开课);How Life Began on the Earth;;Pangu separates the sky from the earth;God created the world in seven days;Some legends about the beginning of universe.; ;Read the passage quickly to catch the main idea of the passage : Topic:_______________ Key words: _______--_______---_______--______;Key words: 1.___________ 2.___________ 3.__________ 4.___________ ;New words ; Stephen William Hawking,put forward a theory about black holes.;The most powerful force in the univers is atomic bomb ;Carbon ,nitrogen,water vapour and other [kɑ:b?n] [naitr?d?n] [veip?] gases are to make the earh’s atmosphere.; [mλltiplai] Plants multiplied and filled the oceans and sea with oxgen;;Reptiles produced young generallyby laying eggs; [m?m?l] Mammals like monkeys gave birth to young baby animals and produced milk to feed them.;;Water allowed the earth to dissove hurmful gases and acids into the oceans. This produced a chain reaction,which made it possible for life to develop.; [kɑ:b?n] [dai?ksaid] They are putting too much carbon dioxide into the atmosphere ,which prevents heat from escaping the earth into space;in time 及时 lay eggs 下蛋 give birth to 分娩 in one’ turn 轮到某人 prevent …..from…. =stop …from… ;Read the text quickly and match the main idea for 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.;The Big Bang ;;;A cloud of dust Combine into a solid ball Explode…with fire roc