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课件网) Unit 5 Understanding ideas A Journey of Discovery Look at the evolutionary tree. What species do you recognise in the picture I can see human, zebra, paramecium, snail, earthworm, crab, fish, tortoise, bird, frog, fern, algae, moss，angiosperm and so on. zebra frog snail tortoise human evolutionary tree进化树 jellyfish 水母 crab fish fern 蕨类植物 paramecium 草履虫 earthworm 蚯蚓 algae 水藻 bird starfish moss angiosperm被子植物 platyhelminth 扁形动物（蠕虫等） annelid 环节动物 gymnosperm 裸子植物 Lead-in Look and speak Activity 1 genetic mutation and variation What factors can cause the process of evolution evolutionary tree factors natural selection population immigration environmental changes cultural preferences Lead-in Look and speak Activity 1 While mentioning evolution,what will you think of Pre-reading Think and speak Activity 2 Charles Darwin is a well-known naturalist and biologist. Born in 1809 in England.His most famous work is "On the Origin of Species," published in 1859. In this book, he proposed the theory of evolution by natural selection, which suggests that species change over time through a process of natural selection. This theory caused controversy at the time, but it has since become widely accepted in the scientific community. Darwin also made important contributions to the study of geology, botany, and zoology. He was a prolific writer and published many books and articles throughout his career. Charles Darwin Pre-reading Think and speak Activity 2 Read the text about Darwin and tell us your understanding of the title. journey: an act of travelling from one place to another, especially when they are far apart （尤指长途）旅行，行程 The title may indicate that the work leading to the discovery takes quite a long time and great efforts, determination and perseverance. A Journey of Discovery Read and tell While reading Activity 3 Choose the main idea of the text. Darwin’s interest in various living things made him a great naturalist. Darwin’s journey on the Beagle inspired his Theory of Evolution. Darwin went on a journey to confirm his theory that humans had evolved over time. Read for the main idea While reading Activity 4 What was thhe old ideas about evolution At that time, many people believed that all species had appeared on Earth at the same time and had not changed since.But Darwin began to think differently.... Read for details While reading Activity 3 Number the puzzle piece in order. Organize information from the text and complete them Read and complete While reading Activity 4 He noticed that some species of animals were _____ ON HIS JOURNEY Darwin studies_____ various living things in their natural environments and samples of the plants and animals he had collected. very similar to each other GENERATE LEADS Darwin asked the questions: How diid different species_____ _____ come to exist Maybe animals evolved as they adapted to their changing enviro ... ...
