1、Unit 4 Amazing ScienceTopic 2 Im excited about the things that will be discovered in the future.Section C 課件 1 Besides the earth, do you know other planets? Solar systemMarsThe Red PlanetWhat do you know about Mars? What does it look like?= What is it like? (事物)Compare Mars with the earth: size, col

2、or, gravity, temperature, the oxygen What do you know about Mars? What does it look like? Mars is the fourth planet from the sun in our solar system and is named after Mars, the Roman god of war. Its diameter is 53% as wide as that of the earth. Mars goes around the sun at a distance of about 228 mi

3、llion kilometers. You can tell which planet is Mars because it is bright red in the night sky. It looks like a red and orange ball. Its very beautiful. But during spring and summer, strong storms can cover the whole surface of Mars. The gravity on the surface of Mars is about two-fifths as strong as

4、 it is on earth. So a person (who weighs 90 kilos on earth) weighs only 36 kilos on Mars. The temperature on Mars is between -138 C and 28 C. The air has only 0.13% oxygen. It takes a spaceship about eight months to reach Mars from the earth when the two planets are closet to each other. Scientists

5、are still searching for more information about Mars.1a Read and answer the questions:1.What is Mars named after?Its named after the Roman god of war.2. How far is Mars from the sun?At a distance of about 228 million kilometers.3. How much does a person weigh if he weighs 150 kilos on earth?60 kilos.

6、4.Can human beings live on Mars?No, because1b work aloneRead 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 earthbright red in the night skya red and orange ballabout two-fifths as strong as it is on eart

7、habout 228 million kilometersDuring spring and summer, strong storms can cover the whole surface of Mars. The temperature on Mars is between 138 and 28 .Key points1. at a distance of +數字 “相隔遠” at+價格：They sell the rice at 5 Yuan per kilo.at+速度He drove at a speed of 90 kilometers per hour. at+時刻： I us

8、ually get up at 6 oclock.另：in the distance 在遠處,遠遠地Can you see the mountain in the distance.2. be named after 以命名；按來命名 西部的孩子經常根據他們的父親來命名。 Children in the west are usually named after their fathers.3.tell 常和can, could, be able to連用,意為“辨別,區別,認出”tell A from B: 分辨出A 和B我辨別不出她和她妹妹。I cant tell her from her

9、sister.tell the differences between A and B: 辨別A和B 的不同點我辨別不出這個詞和那個詞的區別。I cant tell the differences between this word and that one.Which one is true? I cant tell. 我辨別不出。4. search (sb/sth/sw) for sth/sb搜尋他們正在搜尋那個房間，找那個丟了的錢包。They are searching the room for the lost purse.5. 含倍數的同級比較: “倍數(a quarter/ hal

10、f/twice/three times/分數等) +as+形容詞或副詞+as”例:1. 這把尺子是那把尺子的一半長。 2. 他跑起來有她的兩倍快. This ruler is half as long as that one.He runs twice as fast as her.例：這個房間比那個房間大三倍。含倍數的比較級: “倍數(a quarter/ half/twice/three times/分數等) +形容詞或副詞比較級+than This room is three times bigger than that one.This room is four times as bi

11、g as that one.1c Pair workDiscuss the following crazy questions with your partner and state your seasons.Does Mars have a good climate for plants?Is Mars a useful place to dry fruit?Is Mars a good place for human beings to live?Is Mars a comfortable place for heavy people?2c work alone Kangkangs unc

12、le sent an e-mail to him from Mars, but some words are missing. Listening to the tape and complete it.The journey has gone very well.Hi Kangkang, It has been two days since we landed on Mars. It took us more than _ _ to get here. Generally, the journey went well, but the living _ were quite bad duri

13、ng the journey. We had to _ most of the food in the spaceship. two yearsconditionsproduceWhats worse, our water supplies were very _. We had to limit the use of water during those days. It is six weeks since we had a proper _. Seven hundred and sixty-three dayswhat a long time! I often _ the family,

14、 but the excitement of being on Mars is worth it! Good luck! Yours, Uncle StephenlowshowermissPhrases in Section C了解 太陽系以命名繞著地球轉在夜空互相離得最近搜尋 離已有時間了在旅程期間限制水的使用值得know about the solar systembe named aftergo around the earthin the night skybe closest to each othersearch forItssince.during the journeylimit the use of waterbe worth ofSummaryWe learn: 1. Some words: storm, weigh, journey 2. Some phrases: name after, as as, at a distance of, search for3. Some sentences:(1) Its diameter is 53% as wide as that of the earth.(2) It has been two days since we landed on Mars.We