Transcript 幻灯片1
Module 3 Unit 2 We haven’t found life on other planets yet. Journey to space Look at the picture and the title of the unit. Think about things you know about life on other planets. We’ve been to the moon, and there’s no life there. Scientists think that there has been life on Earth for millions of years. However, we haven’t found life on other planets yet. Why not ? The Earth is a planet and it goes around the sun. Eight other planets also go around the Sun. None of them has an environment with air, so people and things cannot grow. The Sun and its planets are called the solar system. The solar system is a small part of our galaxy. The stars we see at night are the suns in other solar systems. There are more than 200 billion stars in our galaxy, called the Milky Way, and our Sun is only one of them. But scientists have discovered many other galaxies in the universe. They are a long way and their light has travelled for many years to reach us. It is hard to understand how large the universe is. Scientists have sent lots of spacecraft to look at other planets in our solar system, and some spacecraft have gone beyond the solar system. However, no one has discovered any life in space yet. But why has no one from other planets sent us a message? Have they tried to send information to us? With so many stars in the universe, are we alone, or is there life out there in space? We don’t know … yet. Read the passage in Activity 2 and choose the best title. Put the words and expressions in the box in order: small—large galaxy planet solar system star universe planet star solar system galaxy universe Check (✓) the true sentences. 2. The Sun is a star. V 3. There is more than one galaxy. 5. The light from stars has taken a long time to reach us. V V Answer the questions about the words in the box. air alone beyond grow million reach 1. Who and what needs air? 2. How often are you alone? 3. What is there beyond your school entrance? 4. How much have you grown in the last three years ? 5. What costs a million yuan ? 6. How long does it take to reach Beijing/Guangzhou ? Writing Look at the cartoon picture in Activity 6 and answer the questions. What have the scientists just heard? ( message from spacecraft ) They’ve just heard a message from a spacecraft. 1. Where has it landed ? ( Mars ) ______________________________ 2. What has it discovered ? ( people ) _______________________________ 3. Why haven’t they sent us a message? (can’t hear us) _______________________________ 4. Why haven’t they visited us on Earth ? ( prefer life on Mars) _____________________________ 5. What have they made with the other spacecraft ? (TVs, radios, cars) _____________________________ Important and difficult points 1. alone adj. & adv. without any other people 独自(的);单独(的) lonely adj. 寂寞;孤独 e.g. The old man was alone in the house, he felt very lonely . 这位老人一个人在屋里, 他感到非 常孤独。 She lives alone , but she doesn’t feel lonely . 她独自住着, 但并不感到孤独 。 2. beyond prep. More than sth .超出; 除……之外 We have learned beyond 3,000 words. 我们已经学了3000多个单词. 3. no one 意思是 “没人”, 是两个单 词. no one=nobody,指人; 做主语时, 谓语动词只能用单数,不能用复数. no one 后面不能接of. e.g. No one told us about that关于那 件事没人告诉过我们. none 也有 “没人” 之意,而且还 有 “ 没有物” 之意, 不过是指三人 或三人以上的人或物. 做主语时,其谓 遇动词用单复数都可以. none一般可 与 of 连用. e.g. None of you haven’t finished the work. 你们都没有完成这项工作. 5. so many 意思是“那么多的…”修饰 可数名词复数,经常与that 从句搭配, 构成“ so many +可数n.复数＋that…” 句型。 e.g. There are so many stars in the sky that none can count out. 天空中这么多的星星,没有人数得清。 so much “那么多的…”修饰不可数名词。 e.g. He ate so much food that he couldn’t stand up. 他吃了那么多食物以至于站不起 来了。 6. Scientists thinks that there has been life on Earth for millions of years. 科学家认为地球上存在生命已经数 万年了。 精讲:that 引导的宾语从句 从句中there has been 是there be 结构 的现在完成时态。 millions of + (pl.) none 表示 “数百万计的…” hundreds of, thousands of e.g. There are hundreds of students in our school. Millions of stars are shining in the sky. There are thousands of sheep on the hill. 7. The sun and its planets are called the solar system. 太阳和它的行星被叫作太阳系. 精讲:本句中的are called 是被动语态. 被动语态的构成:be +过去分词. e.g. The picture is drawn by him. The letter is written by her. Wb. Ex. 1, 2 , 4 , 5&8 Homework Write the story in the picture in Activity 6. Use the answers to the questions in Activity 6 to help you.