七上Unit4Topic2SectionC教学课件.ppt

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1、Unit 4 Amazing ScienceTopic 2 Im excited about the things that will be discovered in the future. Section C Do you know anything about Mars? solar system Mars is the fourth planet from the sun in our solar system and is named after Mars, the Roman god of war. Marsthe Roman god of war 太阳系太阳系罗马战神罗马战神1a

2、 Read and understand. Look at the pictures and predict which statements are true about Mars. Then read the passage quickly and check the answers._ 1. Mars looks like a red ball. _ 2. The temperature on Mars is very high._ 3. Mars is much larger than the earth._ 4. Mars is too far away for us to reac

3、h.TFFF1b Read 1a again and write down the information about Mars. Diameter Color Shape Climate Gravity Distance from the sun 53% as wide as that of the earth red and orangea ball during spring and summer: strong storms temperature: between-138and 28about two-fifths as strong as it is on earth about

4、228 million kilometers half as big as 是是的一半大的一半大twice as long as 是是的两倍长的两倍长This bag is three times as heavy as that one.My study is about three-fourths as big as my bedroom.Hi Kangkang,It has been two days_( since ,from) we landed on Mars. It _(cost, took) us more than two years to_ (reach, get) her

5、e. Generally, the journey went well, but the living conditions were_( quiet, quite) bad during the journey. We had to produce most of the food in the spaceship. _(Whats more, Whats worse), our water supplies were very low. We had to limit the use of water during _(those, these) days. So we had a sho

6、wer every six weeks. We will spend another seven hundred and sixty-three days on Mars. _( How, What )a long time! I often miss the family, but the excitement of being on Mars is worth it!Wish me luck! Yours, Uncle StephensincetookgetquiteWhats worsethoseWhat2 Kangkangs uncle sent an e-mail to him fr

7、om Mars. Choose the right words to complete the letter. Dear Uncle, Im very glad to receive your e-mail, and I know that the living conditions were quite bad during your journey. I am interested in the information about Mars. Can you tell me more about it ? How about the weather on Mars? Is it very

8、cold? What kind of transportation do you use there? I am looking forward to your e-mail! Good luck! Yours, Kangkang You can write it like this :SummaryWe learn: 1. Some words: storm, weigh, journey 2. Some phrases: name after, as as, at a distance of, search for 3. Some sentences: (1) Its diameter i

9、s 53% as wide as that of the earth. (2) It has been two days since we landed on Mars.We can : 1. Talk about something more about Mars. 2. Write back an e-mail. Read 1a. Memorize the useful expressions and key sentences which we learned today. Finish Section C in your workbook. Review Sections A-C.n.

10、 风暴风暴，暴，暴(风风)雨雨It is much smaller than the earth. Its diameter is 53% of the earths.直径直径During spring and summer, the strong storms can cover the whole surface of Mars. The gravity on its surface is about 40% as strong as it is on earth. 引力，重力引力，重力Listen to 1a and answer the questions. (1) What does

11、 Mars look like? It looks like a red and orange ball. (2) How far is Mars from the sun? Its about 228 million kilometers away from the sun. (3) Whats the temperature on Mars? It is between -138and 28.1a Read and understand. 1. Its diameter is 53% as wide as that of the earth.它的直径是地球直径的它的直径是地球直径的53%。

12、 2. The gravity on the surface of Mars is about two-fifths as strong as it is on earth.火星表面火星表面 的引力大约是地球引力的五分之二。的引力大约是地球引力的五分之二。 倍数倍数(分数分数)+ as +adj.+as 的的几倍几倍 3. Mars goes around the sun at a distance of about 228 million kilometers.火星在距太阳约火星在距太阳约 228 000 000千米处环绕着太阳转。千米处环绕着太阳转。 at a distance of 有有

13、 距离距离 4. Scientists are still searching for more information about Mars.科学家们正在对火星进行更多的探索。科学家们正在对火星进行更多的探索。 search for :表示表示没有没有“被搜索的对象被搜索的对象” 只有只有“寻找的目寻找的目标标” 。如：。如： All night they searched for the lost boy. search for表示搜查某一对象的目的是要找到什么表示搜查某一对象的目的是要找到什么, 强调有具体的目标。如：强调有具体的目标。如： She searched many shops

14、 for Jims gift. search 意为意为“在在搜查搜查”或或“搜身搜身”, 是个及物动词，是个及物动词，后面直接跟后面直接跟“被搜查的对象被搜查的对象”。如：如： Mr.Smith searched every room in the house. Key words Mars, fourth, be named after, diameter, as wide as, at a distance of, tell, because, bright red, ball, storms, gravity, temperature, oxygen, eight months, clo

15、sest to, searching forRetell 1a Mars, the _ planet of the solar system, goes around the sun at a _ of about 228 million kilometers. Its _ is 53% as wide as that of the earth. It looks like a _ and _ball. Its very beautiful. But during _ and _, strong _can cover the whole_of Mars. The gravity on the

16、surface of it is about _ as_as it is on earth. fourthdistanceredorangespringsummerstormssurfacetwo-fifthsstrongdiameter1c Discuss the crazy questions with your partner and state your reasons. 1. Does Mars have a good climate for plants? 2. Is Mars a useful place to dry fruit? 3. Is Mars a good place

17、 for human beings to live? 4. Is Mars a comfortable place for heavy people? Read 2 and answer the questions. (1) Who is this e-mail from and to? It is from Uncle Stephen to Kangkang. (2) How long did it take them to get there? More than two years. (3) Did everything go well during the journey? No, i

18、t didnt. What are you going to be when you grow up？Why? clothing food and drinks weather transportation 3a Write back an e-mail to Uncle Stephen for Kangkang and ask him for more information about Mars. The list may help you. 3b Work in pairs. Check your partners e-mail and use your knowledge of Mars to answer the questions for Uncle Stephen.