Unit1 Making a difference period二 人教版 课件VIP专享VIP免费

Unit1 Making a differencePeriod2 Listening & SpeakingTask 1 : Quiz questions1. Which scientist discovered that objects in water are lifted up by a force that helps them float ? Archimedes (287—212 BC)Archimedes: Ancient Greek. He was a mathematician. He found that if you put an object into water the water pushes the object up. It rises and partly floats. • Give me a place to stand on, and I can move the earth. ----Archimedes2 Who wrote a book explaining how animals and plants developed as the environment changed ?Charlie Darwin(1808-1882)Britain naturalist. The Origin of Species was published in 1859. It explained how plants and animals had changed over time to fit in with a changing environment. His book showed that people had developed from apes.3. Who used peas to show how physical characteristics are passed from parents to their children ?• characteristic: a typical or noticeable quality of someone or something:• Unfortunately a big nose is a family characteristic.• Build society of Chinese characteristic.Gregor Mendel(1822—1884) Gregor Mendel. Czech. The father of genetic. He grew pea plants and developed ideas on heredity ( 遗传 ) and inherited characteristics. Between 1856—1863 he grew 28,000 pea plants. He examined seven kinds of seed and plant characteristics and developed some laws of inheritance.4. Who discovered radium?Marie Curie ( Polish )Marie Curie (1867-1934) was born in Poland, moved to Paris and studied chemistry and physics there. She married Pierre Curie and together they studied radioactive materials and discovered radium. In 1911 she received the Nobel Prize in Chemistry. Her death in 1934 was almost certainly due to radiation in her work.5. Who invented the way of gi...