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1、the science of the stars Unit 4 Astronomy Contents Warming up Pre-reading Reading Sum up Consolidation Homework Pre-reading Warming up 1. Who are our ancestors? 2. Do you know how life begins on the earth? Lets brainstorm the following questions Lets enjoy a video first. Try to put the right order o
2、f development of life on the earth? ? ? If you want to know more, please turn to Page 25 Look at title and the pictures. Can you get some information about what we will learn from the text ? Big bang ? The evolution of life on the earth ? The text may tell us the _ of the earth and the _ of life on
3、it. How life begin on the earth Pre-readingPre-reading Fast reading Answer the following questions. 1. How many paragraphs are there in the text ? 2. What is the widely accepted theory in Para 1? 3. Why was life able to develop on the earth but not on other planets ? 4. A. the earth had a solid shap
4、e. 5. B. the earth didnt have harmful gases. 6. C. the water stayed on the earth but not on other planets. 4. Can you sum up the main ideas of each paragraph? Firstly, you can find the key words of each paragraph Tip: Para. 1 The formation(形成) of the earth. Para. 2 The importance of water for life.
5、Para. 3 A widely accepted theory about the formation of the universe. Para. 4 The arrival of humans and their impact on the earth. Para. 5 The development of plants and animals on the earth. Careful reading Task one Read the text again, tell me how the author organizes the text? According to time Ok
6、, please quickly find the time from the text. Ok, next we will read the text according to time Several billion years after the “ big bang ” between 4.5 and 3.8 billion years ago Many millions of years later About 2.6 million years ago Timeline Para 2 Several billion years after the “ big bang ” betw
7、een 4.5 and 3.8 billion years ago The earth was still just _. Then the dust settled into a _. Then the earth became so _ and explode to produce its_. solid globe violent atmosphere Task two a cloud of dust Para 4 Many millions of years later The first small plants on the surface of the water produce
8、d_ . Early _ and all sorts of fish appeared. _ began to grow on land. followed by_ , some are _. others, called_ oxygen shellfish green plants land animals insects amphibians Many millions of years later When the plants grew into forests, _appeared. After that, some _, called dinosaurs developed. Th
9、e disappearance of dinosaurs made possible the rise of _ on the earth. reptiles huge animals mammals About 2.6 million years ago Now Humans produce too much carbon dioxide , making the earth too hot to live in. Para 5 After the clever animals (humans) became important on the earth, what happened? An
10、swer question 1 2 3 45 6 7 Lets check whether we put the right order at first. Are you right? Task three Please read the text again, then put the order of these sentences. ( exercise 2, page 27) Insects and amphibians appeared The earth became a solid ball Reptiles appeared. The earth was a cloud of
11、 dust. Shellfish and other fish appeared. Clever animals with hands and feet appeared. Dinosaurs appeared. Small plants grew on the water. Plants began to grew on the earth. Water appeared on the earth. The universe begin with a “big bang” Mammals appeared. Big Bang4.5-3.8 billion many million years
12、 later 2.6 million Now Time Events Big Bang dust solid globe water appears small plants shellfish and fish plants grow on the landinsects and amphibians reptiles dinosaur mammals clever animals humans life earth Sum up The text may tell us the _ of the earth and after _ appear, the _ of life one aft
13、er another on it. formation water development Consolidation Task one Lets listen to the recording of Para5, and then reading it loudly. You should pay attention to the pronunciation, intonation and tone. In the last paragraph, we know humans face seriously global warming problem, which is threatenin
14、g our existence. Can you write something to call on us to protect our environment ? Task two The earth we live in is becoming more and more terrible, so we must take measures to deal with it Firstly: Secondly: Thirdly: We hope the environment will become more and more beautiful. Sample The earth we
15、live in is becoming more and more terrible, so we must take measures to deal with it Firstly, the government should pass laws to prevent people and factories from polluting the environment. Secondly, everyone should realize the importance of the problem and try their best to protect the environment and fight against pollution. Besides, its a good ideas to plant trees to improve the environment. We hope our earth will become more and more beautiful. 例文 1. Learn the new words by heart 2. Listen to the recording of t
