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Introduction·& Cultural Corner,Unit 4 Great Scientist,genetics,botany,zoology,,,,Match the words with definitions.,biochemistry biology botany chemistry genetics physics zoology,the study of animals The study of the structure of substances and how they react with each other the study of plants The study of inherited characteristics in living things The study of physical and natural forces The study of chemical processes in living things The study of all living things,zoology,chemistry,botany,genetics,physics,biology,biochemistry,Qian Xuesen,Archimedes,Madame curie,Albert Einstein,Polonium& Radium,Buoyancy(浮力),relativity,In 1905,About 240BC,in1898,,,Please listen carefully !!!!,Paragraph,According to Paragraph 1 ,which is not mentioned? A , rockets can be used to send astronauts into space B , rockets can be used to burn fireworks C , rockets were used in 2000 Olympics .,Paragraph,1 Rockets _____ probably _______by ________about _______ years ago. 2 The idea of the rockets ____ _____,were,invented,accident,2000,was born,Paragraph,1. The first military use of rockets was in 1923. 2. Between the 12th and 14th centuries there were many rockets experiments in England ,France and Italy.,,,Paragraph,Everyone wanted to use rockets in battles. Wan Hu became the world’s first astronaut?,1 When and where were rockets invented?,2 How were rockets invented?,3 How were rockets used in the early stage?,4 What are they used for today?,Answer the questions,1 When and where were rockets invented?,Rockets were probably invented by accident in China about 2000 years ago.,2 How were rockets invented?,The idea of rockets came from the discovery that the gas escaping from the tube could lift into the air,Answers,4 What are they used for today?,They can be used in many ways ,such as ,to send astronauts and spaceship into space, to make fireworks displays, and so on.,3 How were rockets used in the early stage?,The rockets were once used for military purpose .they were also used for gun in the past ,though it was very dangerous,同學(xué)們,來(lái)學(xué)校和回家的路上要注意安全,同學(xué)們,來(lái)學(xué)校和回家的路上要注意安全,