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江苏省姜堰市张甸中学2012届高三英语一轮复习牛津译林版模块选修10《Unit 3 Protecting ourselves》学案一

发布时间：2017-02-17 编辑：查字典英语网小编

　　教学目标 analyze a text

　　教学重点

　　教学难点

　　教具准备 a projector

　　教学内容教法与学法

　　simple?

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

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　　3 Go over Part 3. This part will tell you 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.

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

　　Step3 Consolidations

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

　　Now let’s come to Parts C1 and C2 on page 116 in Workbook, so that you can have more chances to practice what you have learnt in this section.

　　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 _____________________________________