外研版八年级下册英语教学课件-Module 3 -Unit 2 other planets yet 29页

3 Unit 2 We have not found life on any other planets yet. How much do you know about other planets? Reading and vocabulary 1. Work in pairs.Look at the picture and talk about what you know about Chinese spaceships. Shenzhou9 is a manned spaceship. 魔法 记忆 Learning to learn When you read a passage with a title and pictures, think about the words you may find in the passage， and the questions you may want to ask before you start to read. 2.Read the passage and choose the best title for it. 1 Anyone out there? 2 Life on the earth 3 The sun and other stars 4 The stars at night ____________________ Scientists think that there has been life on the earth for hundreds of millions of years.However, we have not found life on any other planets yet. Anyone out there? The earth is a planet and it goes around the sun.Seven other planets also go around the sun.None❶of them has an environment like that of the earth, so scientists do not think they will find life on them.The sun and its planets are called the solar system，and our solar system is a small part of a much larger group of stars and planets, called the Galaxy or the Milky Way.There are billions❷of stars in the Galaxy, and our sun is only one of them. Scientists have also discovered many other galaxies in the universe.They are very far away and their light has to travel for many years to reach us.So how large is the universe? It is impossible to imagine. Scientists have sent spaceships to the planet Mars to take photos.They have even sent spaceships to travel outside the solar system.However，no spaceship has travelled far enough❸to reach other stars in our Galaxy. Scientists have always asked the questions：with so many stars in the universe, are we alone, or is there life out there in space? Have there been visitors to the earth from other planets? Why has no one communicated❹with us? We do not know the answers... yet. 1 none/nʌn/pron.没有一人；没有一个；一点儿也没有 none既可指人，也可指物，是不定代词， 指“三者或三者以上都不”，与all互为反义词。 eg：—How many birds are there in the tree? 树上有几只鸟？ —None.一只也没有。 eg：—Is there any more sugar? 还有糖吗？ —No, none at all.不，一点儿也没有了。 魔法 记忆 —It snowed heavily last night.Is everyone in our class here today? —Yes, and________ of us was late for school this morning. A．none　B．neither　C．all　D．Either 典例 A 【点拨】此题用词义辨析法。none指“三者或三者以上都 不”，其反义词为all，而B、D项常用于两者。由答语Yes 可知今天大家上学都没迟到。 魔法 记忆 none of...“没有一个……，都不……”。none of短语作主语时，如果代替可数名词，谓语 动词可用单数也可用复数；如果代替不可数 名词，谓语动词只能用单数形式。 eg：None of the money is hers. 这钱没有一点是她的。 None of my friends is/are here. 我的朋友们都不在这里。 魔法 记忆辨析none和no one none用于指人或物,可单独使用,也可以与of连用，常用于回答 how many或how much引导的问句。 eg：—How many birds can you see there? 你在那里能看到多少只鸟？ —None.一只也看不到。 no one,“没有人”，相当于nobody，只用于指人，不可以与 of连用,作主语时谓语动词只能用单数形式，常用于回答who引 导的问句。 eg：—Who is in the library? 谁在图书馆？ —No one.没有人。 根据汉语完成句子。 所有的学生都很累，但他们一个也没有停下来去 休息。 All the students were very tired, but________ ________ ________stopped to have a rest. 典例 none of them 2 billion/'bɪljən/num.十亿 当表示具体数目时，billion后不加s； 当表示不确定的数目时，billion后加s，且后面跟of。 注意：类似用法的词还有：hundred, thousand, million 等。 eg：1.3 billion people 十三亿人； thousands of houses 数以千计的房子 eg：There are billions of trees in the country. 这个国家有数十亿棵树。 巧记billion的用法： 模糊数字两有(有s，有of)， 具体数字两无(无s，无of)。 多么令人悲伤的消息啊！数以千计的人在尼泊尔 地震中丧生。 ________ sad news! __________ of people lost their lives in the earthquake in Nepal.(福州) 典例 What 【点拨】由于news为不可数名词，本句为what引导的感叹句。 由第二个空格后的of可推知此处为固定短语thousands of。 Thousands 3 (高频)enough/ɪ'nʌf/adv.充分地；足够地 enough作副词，修饰形容词或副词时放在被修 饰词后面。 eg：He is not old enough to join the army. 他年龄尚小，不能参军。 eg：She was lucky enough to catch the last bus. 她能赶上末班车很幸运。 The dining hall is________ to hold 300 people. (梅州) A．enough big　　　B．enough small C．small enough D．big enough 典例 D 【点拨】此题用语法分析法， 句意为“这家餐厅足够大， 能容纳300人”。副词enough修饰形容词，enough需后置， 由题意可知答案。 enough作限定词，修饰名词可放在被修饰词 之前或之后，但放在名词前面更常见。 eg：We have enough time to finish the work. ＝ We have time enough to finish the work. 我们有充足的时间完成这项工作。 巧记enough歌诀 enough词性有三个：限定、代词和副词。 若作定语修饰名，名词前后由你定。 副词状语表程度，定在形、副后边行。 若是用在形、副前，enough位置准错用。 “...not＋adj.＋enough＋to do sth.”常和 “too...to...”和“so...that＋否定形式的从句” 互换。 eg：他年龄尚小，不能开车。 He is not old enough to drive a car. ＝He is too young to drive a car. ＝He is so young that he can't drive a car. Lucy isn't old enough to carry the box. A．is so young that she can B．isn't young enough to C．is too young to D．is so young to 典例 C 【点拨】“...not＋adj.＋enough＋to do sth.”可以和 “too...to...”和“so...that＋否定形式的从句”互换。　 4 communicate/kə'mjuːnɪkeɪt/v.沟通;交流;传递 communicate with sb.“与某人交流”。　 eg：They use their own language to communicate with each other. 他们用他们自己的语言互相交流。 eg：We should communicate our policy to the local people. 我们应该把我们的政策传递给当地人民。 Today，WeChat(微信)becomes very popular, and more and more people like to use it to ________ each other. A．depend on　　 B．communicate with C．believe in 典例 B 【点拨】depend on“依靠”；communicate with“和…… 交流”；believe in“信任”；由语境可知答案。 communicate sth.to sb.“向某人传递某物”。　 eg：Kate often communicates messages to her friends. 凯特经常给她的朋友们传达信息。 3. Check (√)the true sentences. 1 The earth is a star.□ 2 The sun is a star.□ 3 There is more than one galaxy in the universe.□ 4 The light from the stars in other galaxies has travelled for a long time to reach us.□ 5 Scientists have received many messages from space.□ 6 Spaceships have visited most of the universe.□ √ √ √ 4. Complete the passage with the words and expression in the box. communicate environment none solar system universe Is there life on other planets? There are seven other planets in our (1)______________，but (2)________of them has a(n)(3)____________ like that of the earth.Spaceships from the earth have done surveys of the other planets, but they have not found any life there.Why has no one from other planets tried to (4)____________ with us? It is true that scientists have not discovered life on other planets in the (5)________ yet, but some scientists believe that they will find it some day. solar system none environment communicate universe Writing 5.Look at the picture from a science story for children and answer the questions. What have the scientists just received? (a message from one of our spaceships) They have just received a message from one of our spaceships. 1 Where has the spaceship landed? (Mars) It has landed on Mars. 2 What has the spaceship discovered? (people on Mars) 3 Why have the people on Mars not sent us a message? (do not know how to) 4 Why have the people on Mars not visited us on the earth? (do not know how to) It has discovered people on Mars. Because they do not know how to send us a message. Because they do not know how to visit us on the earth. 6.Write a passage to describe the picture.Use your answers to the questions in Activity 5 to help you. We have just received a message from our spaceship to Mars... ,and we have discovered people.These people haven't sent us a message because they don't know how to send a message.They haven't visited us on earth because they don't know how to visit us.They have used part of the other spaceship from the earth to make TVs, radios and cars. Homework Get more information about planets.