老师：hello everyone im li 金花 from 和平精 number one。 Middle School. Nice to meet you here. Today we are going to learn Unit 3, Conservation, lesson 1, the Sixth Extinction reading. Before we read the passage, I'd like you to look at a picture. Look at here. What can you see in it? Obviously, from the picture we can see in a wood there is a Tombstone with a statue of a bird on it. The name of the bird and other information about it is written on the Tombstone. This kind of bird is called doodle bird. The island of Mauritius is its home. What shock us are the last words on it. It rise last scene, 1681. That means this kind of bird is in the state of extinction. So what is extinction? Think about it. According to dictionaries, extinction is a situation in which something no longer exists. 2 two birds were last seen in the world in 1681. They no longer exist in the world. So they are in the state of extinction. What else do you know is also in the state of extinction? Yes, Dinosaur. About 66 million years ago, dinosaurs died out. Therefore, we say that dinosaurs are also in the state of extinction. Have you understood the meaning of extinction? You are right. In Chinese, extinction means Mia jue. Then how much do you know about extinction? Let's do a little quiz. Open your bags and turn to page 52. Look at the part of activate and share, read the questions about extinction and choose the one you think is right. Number one, how many times up to today has life on earth almost died out? A, once, big. Five times. See, more than 10 times. Which one do you think is correct? Take the one you think he's right. Number two, about which percent of all species on earth became extinct during the mass extinction known as the Great Dying? A, less than 10%. B, nearly 50%. See, more than 90%. Do you know the meaning of the word extinct? It is the additive form of extinction.
老师：so it means 灭绝的 which of the numbers is right choose one。
老师：Now the last one, what do scientists think will cause the next mass extinction? A human activity, big natural courses, see unknown reasons? Which one do you choose? Now, you have got your answers to the questions right. Just leave them here and we will check the answers after we read the passage. Now let's read the passage whose title is The Sixth Extinction. Please read through the full passage and also the case study on page 53. While reading, please finish the two tasks.
老师：No. 1, check whether your answers in the quiz are right. No. 2, give the main idea of each paragraph. Do you still remember how to get the main idea of a paragraph? Yes. Firstly, underlying the topic sentence in each paragraph, and then get the main idea from them. While reading, if you meet any unknown words or phrases, try to use context to understand them. H
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