江苏省高邮市界首中学高三英语一轮复习学案：《Unit 3 Protecting ourselves6-7》

　　Period 6-7 Grammar and usage(1-2)

　　Learning aims（学习目标）：text.

　　2. Learn how to analyze a text.

　　Important and difficult points（重点难点）：grammar.

　　预习导航

　　When we read a text, in order to know the development of it, is it necessary to have a clear structure of this text? How a text should be written to allow readers to move from one idea to the next easily?

　　合作探究【有疑有问议一议】

　　Step 1: The development of a text

　　Task 1: We have learnt the TV news transcript; now let’s go back to the text again to find something more.

　　How many paragraphs are there in the text?

　　What is the title of the text?

　　Can we learn what the text is about from the title?

　　If you are asked to divide the whole text into several parts, how will you divide it?

　　What is the main idea of the first / second / last part?

　　Can you see how a text is developed?

　　Conclusion: ________________________________________________________________

　　Task 2: Go through the content on page 40 and answer these questions.

　　Read the guidelines and Part 1. Can you also think of some titles of some other articles that are not too long and are clear and simple?

　　Go over the three points of Part 2 and see what should be included in the beginning paragraph.

　　Go over Part 3. This part will tell us that each body paragraph usually contains a topic sentences and a concluding sentence to the paragraph. Try to find what the topic sentence should be like and where it can be found, what supporting sentences are, and what the function of a concluding sentence is in a paragraph.

　　Read Part 4 and try to find how the concluding paragraph functions in a text.

　　Task 3: Do the exercise on page 41. Read the sentences and decide which paragraph they belong to and what type of sentence each one is.

　　巩固拓展【能力升华提一提】

　　Read the following passage and do the exercises as you are required to.

　　Are There Extra-Terrestrials?

　　(1) Many scientists today believe that life exists elsewhere in the universe—life probably much like that on our own planet. They reason in the following way.

　　(2) As far as astronomers can determine, the entire universe is built of the same matter. They have no reason to doubt that matter obeys the same laws in every part of the universe. Therefore, it is reasonable to guess that other stars, with their own planets, were born in same way as our own solar system. What we know of life on earth suggests that life will arise wherever the proper conditions exist.

　　(3) Life requires the right amount and kind of atmosphere. This eliminates all those planets in the universe that are not about the same size and weight as the earth. A smaller planet would lose its atmosphere; a larger one would hold too much of it.

　　(4) Life also requires a steady supply of heat and light. This eliminates double stars, or stars that burn up suddenly. Only single stars that are steady sources of heat and light like our sun would quality. Finally, life could develop only if the planet is just the right distance from its sun. With a weaker sun than our own, the planet would have to be closer to it. With a stronger sun, it would have to be farther away.

　　(5) If we suppose that every star in the universe has a family of planets, then how many planets might support life? First, eliminate those stars that are not like our sun. Next, eliminate most of their planets; they are either too far from or too close to their suns. Then eliminate all those planets which are not the same size and weight as the earth. Finally, remember that the proper conditions do not necessarily mean that life actually does exist on a planet. It may not have begun yet, or it may have already died out.

　　(6) This process of eliminate seems to leave very few planets on which earthlike life might be found. However, even if life could exist on only one planet in a million, there are so many billions of planets that this would still leave a vast number on which life could exist.

　　The title __________________________________________________

　　The beginning paragraph _____________________________________

　　Topic sentence ______________________________________________

　　Body paragraph 1 ___________________________________________

　　Topic sentence ______________________________________________

　　Body paragraph 2 ___________________________________________

　　Topic sentence ______________________________________________

　　Body paragraph 3 ___________________________________________

　　Topic sentence ______________________________________________

　　Body paragraph 4 ___________________________________________

　　Topic sentence ______________________________________________

　　The concluding paragraph _____________________________________

　　Topic sentence ______________________________________________

　　课后作业

　　Do Parts C1 and C2 on page 116 in Workbook to practice what we have learnt in this section.