B3U4-Reading必修三第四单元阅读公开课课件.pptVIP

Big Bang A cloud of ____ Atmosphere The earth A solid ______ water The globe was ______ dust globe violent CO2 ,nitrogen,vapor The continued presence of _______ Small________ in the water __________and all sort of fish water plants shellfish multiply fill encourage dissolve Plant on ______ Insect and__________ Dinosaurs The rise of Mammals land Reptiles amphibian Plants grew into forest make possible ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? humans came into being and spread all over the world. Human beings Are human beings very important ? Why did the author said they are not looking after the earth well? The reason is that … It from the earth into space. prevents heat from escaping people are putting carbon dioxide into the atmosphere ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? the earth may become too . The result is that … hot global warming ---green house effect It caused________________________ Ice in the North Pole ________ Water level ________. The result is that … rises melts The end of our world…. What can we do to prevent the earth from becoming worse? Eg. What we can do is to ……. what we can do is that………. it is obvious that……. I advise that … solar energy plant trees recycle rubbish prevent desertification save water purify air What can we do to prevent the earth from becoming worse? What we can do is to drive less. I advise that everyone should take the public transportation as possible as we can. What we can do is to prevent desertification. I advise that the government should lay down serious law on punishing the conduct of cutting trees randoml