book3unit4_Astronomy阅读课件.ppt

Hangzhou Foreign Languages School Bao Xiaoming book3unit4_Astronomy阅读课件 Four short words sum up what has lifted most successful Four short words sum up what has lifted most successful individuals above the crowd: a little bit more. individuals above the crowd: a little bit more. -author -author -date-dateUnit 4solar system太阳系太阳系Hangzhou Foreign Languages School Bao Xiaoming The Solar SystemThe Solar System1111Big BangPangu (盘古盘古)GodNuwaLets review the evolution of life on the earth. After the “Big Bang”, the earth was full of water.Original cells appeared in the ocean. The cells in the water began to separate. Marine animals came into being. Some animals (amphibian & insects) came to land.Reptile appeared. dinosaurs mammalsMan had evolved from apes. They developed new methods of growing food, hunting and moving around. As time went by, they covered the earth and have become the most important animals on the planet.How life began on the earth?Reading Choose the main idea for each paragraph ( ) The arrival of humans and their impact on the earth. ( ) The formation of the earth. ( ) The development of plants and animals on the earth. ( ) A widely accepted theory about the formation of the universe. ( ) The importance of water for life.54213a cloud of energetic dust a solid ballatmosphere a world full of water4132combine into explode with fire and rockdissolve harmful gases Cool down plants in the watershellfish and fishplants on landinsects and amphibiansreptiles dinosaurs mammals They produced young by l_ eggs.ayingThey _ young baby animals and produced milk to feed them.gave birth toDinosaurs e_ on the earth for more than 140 million years.xisted1. Why was the earth different from other planets? A. It produced a lot of heat. B. The water remained. C. The water disappeared. D. It was the oldest planet.Choose the best answer. 2. Why was life able to develop on the earth but not on other planets? A. The earth had a solid shape. B. The earth did not have harmful gases in its atmosphere. C. The water stayed on the earth but not on other planets. D. The earth was not too hot and not too cold. 3. Why was it necessary for plants to grow before animals? A. Animals needed plants to protect them from the sun. B. Plants provided oxygen for animals to breathe. C. Animals could hide from hunters in the forest. D. It was easier for plants to grow. 4. It can be inferred from the text that _. A. after “Big Bang”, what the dust was to become remained a mystery B. plants appeared before the animals C. plants multiplied and filled the oceans with oxygen D. plants played an important part in the appearance of the animals We are making the world better.We are making the world worse.ABDiscussion new methods of growing food(1) What humans developed?new methods of hunting new methods of moving aroundGreenhouse effect(2) But they are not taking care of the earth very well. What problem are humans causing? make the earth too hot put too much carbon dioxide into the atmosphere Too much carbon dioxide is being put into the atmosphere.The earth may become too hot to live on. The earth is becoming hotter and hotter!As young people, what little things can we do for the earth? solar energy plant trees recycle rubbish prevent desertificationsave water purify airWhether life will continue on the earth depends on human beings.Only if we care will we help,only if we help shall all be saved!