Unit 5 Revealing nature Understanding ideas 课件-2024-2025学年高二英语外研版（2019）选择性必修第一册

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 environments? 1 2 LOOK FOR MORE EVIDENCE On the Galapagos Islands: He noticed _______ ________________________________________________ It seemed the beaks ___________________________________________________ that there was a difference between the finches on each of the islands. had evolved according to what food was available on that particular island. 3 DEVELOP IDEAS Darwin suspected that the finches _________________________________ ___________________________ and it had ________________ PROPOSE A THEORY The theory of Evolution” living things, including humans, _______________. had evolved from a common ancestor, which had arrived on the islands a long time before slowly evolved into many new species. had evolved from lower forms of life 4 5 1 4 5 2 3 Read and complete While reading Activity 4 ON HIS JOURNEY GENERATE LEADS LOOK FOR MORE EVIDENCE DEVELOP IDEAS PROPOSE A THEORY Why did Darwin not publish his Theory of Evolution until 1859, about twenty years after his discovery? It may need to collect more information and materials to support the theory. He may be worried about being restricted by the traditional social ideas of that time. At that, Darwin was very young, and he may worry about the publisn of the theory would harm his future. Read and answer While reading Activity 5 Why were many people “shocked” by Darwin’s theory? At that time, many people believed that all species had appeared on Earth at the same time and had not changed since. ... It was a completely new idea - a theory of evolution. Darwin explained this theory in his book, On the Origin of Species. It was not published until 1859 and immediately caused a storm. Many people refused to believe that living things, including humans, had evolved from lower forms of life. They were shocked. But Darwin's scientific studies were so convincing that more and more people started to believe his theory. Read and answer While reading Activity 5 What kind of person was Darwin according to the passage? He was determined and curious about science and was enthusiastic to make new discovers. determined curious enthusiastic Read and answer While reading Activity 5 How do you think the human species will evolve in the future? Humans may become taller and taller. Humans may liver longer. Humans may become wiser and wiser. ... Think and share Post-reading Activity 6 What have you learnt about the spirit of scientific exploration? How can this spirit help you in your life and studies? curiosity perseverance bravery determination strictness questioning spirits of scientific exploration Discussion Post-reading Activity 7 Prepare for a talk about “The Theory of evolution”. Assignment Thanks! $$