Unit 4 Topic 3I dont think alienscan be found in space.Besides the earth, do you know other planets?Solar systemThe Red PlanetWhat do you know about Mars? What does it look like?= What is it like? (事物)Compare Mars with the earth: size, color, 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 million 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 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 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.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 earthabout 228 million kilometersDuring spring and summer, strong storms can cover the whole surface of Mars. The temperature on Mars is between 138 and 28 .1.at a distance of +数字: “相隔远” at+价格：They sell the rice at 5 yuan per kilo. at+速度He drove at a speed of 90 kilometers per hour.at+时刻： I usually get up at 6 oclock. 另：in the distance 在远处,远远地 Can you see the mountain in the distance.2. be named after 以命名；按来命名 西部的孩子经常根据他们的父亲来命名。Children in the west are usually named after their fathers.3.tell 常和can, could, be able to连用,意为“辨别,区别 ,认出” tell A from B: 分辨出A 和B 我辨别不出她和她妹妹。 I cant tell her from her sister. tell the differences between A and B: 辨别A和B 的 不同点 我辨别不出这个词和那个词的区别。 I cant tell the differences between this word and that one. Which one is true? I cant tell. 我辨别不出。4. search (sb/sth/sw) for sth/sb搜寻 他们正在搜寻那个房间，找那个丢了的钱包。 They are searching the room for the lost purse.5. 含倍数的同级比较: “倍数(a quarter/ half/twice/three times/ 分数等) +as+形容词或副词+as” 例:1. 这把尺子是那把尺子的一半长。2. 他跑起来有她的两倍快.例：这个房间比那个房间大三倍。含倍数的比较级: “倍数(a quarter/ half/twice/three times/分数等) +形容词或副词比较级 +thanThis ruler is half as long as that one.This room is three times bigger than that one.This room is four times as big as that one.He runs once faster than her.He runs twice as fast as her.1c Pair workDiscuss the following crazy questions with your partner and state your seasons.1. Does Mars have a good climate for plants?2. Is Mars a useful place to dry fruit?3. Is Mars a good place for human beings to live?4. Is Mars a comfortable place for heavy people?2c work alone Kangkangs uncle sent an e-mail to him from Mars, but some words are missing. Listening to the tape and complete it.Kangkangrenai-edu.comThe 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 during the journey. We had to _ most of the food in the spaceship. two yearsconditions produceWhats 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, but the excitement of being on Mars is worth it!Good luck!Yours,Uncle StephenlowshowermissPhrases in Section C了解 太阳系以命名绕着地球转在夜空互相离得最近搜寻 离已有时间了在旅程期间限制水的使用值得know aboutthe solar systembe named after go around the earthin the night sky be closest to each othersearch for Itssince.during the journeylimit the use of water be worth of