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1、Unit 4 Astronomy: the science of the starsPeriod 2: Warming up and reading学生在学习本课之前，已经有了上一节课的铺垫；熟悉并掌握了跟本课阅读相关的某些词汇，这对于他们对文章的理解有了帮助；此外，对于天文学这块的了解，学生充满好奇，已经在课后对此做了一定的了解；有利于在课堂上积极发言或参与活动。希望通过本堂课的学习，学生不仅掌握相关知识，更激发他们对天文学的兴趣，培养合作学习能力。I. Warming up: Lead-inGood morning, class! Today, we are going to take U
2、nit 4 Astronomy: the science of the stars. Before we read the text, lets turn to page 97 and get familiarized with the vocabulary first. Pay attention to the making of the word. Study the prefixes, roots and suffixes in the words.下面运用多媒体的动画效果更直观地展现太阳系天体的位置，让学生一目了然。并且让学生们展示课后收集的天文知识，老师也可以通过ppt呈现。Play
3、 a game to learn the names and positions of the planets:Venus is next to Mercury.Earth is the third planet.Mars is between Earth and Jupiter.Neptune is the furthest planet from the sun.Saturn is between Uranus and Jupiter.Mercury is closest to the sun.II. Pre-reading1. Looking and sayingHave you eve
4、r wondered how the universe began? Well Im sure you may have many answers to this question, but I have one that perhaps, you may not have heard of yet. I will be giving you my theory on this subject. Now look at the screen and listen to me telling you something exciting.科学家透露：宇宙可能有两个我们的宇宙和一个隐藏的宇宙共同镶
5、嵌在五维空间中。在我们的宇宙早期，这两个宇宙发生了一次相撞事故，相撞产生的能量生成了我们宇宙中的物质和能量。 2. Talking and sharingDo you know how the universe began?In the 1920s in California, astronomer Edwin Hubble observed distant galaxies using an extremely powerful telescope. He made two mind-boggling(unbelievable) discoveries. First, Hubble figu
6、red out that the Milky Way isnt the only galaxy. He realized that faint, cloud-like objects in the night sky are actually other galaxies far, far away. The Milky Way is just one of billions of galaxies. Second, Hubble discovered that the galaxies are constantly moving away from each other. In other
7、words, the universe is expanding. The biggest thing that we know about is getting bigger all the time. A few years later, Belgian astronomer Georges Lematre used Hubbles amazing discoveries to suggest an answer to a big astronomy question: “How did the universe begin?” III. Reading1. Listening and r
8、eading aloudNow please listen to the recording and then read the text aloud. Pay attention to how the native speaker is reading along and where the pauses are within each sentence. I will play the tape twice and you shall read aloud twice, too.2. Reading and underliningNext you are to read and under
9、line all the useful expressions or collocations in the passage. Copy them into your notebook after class as homework.Collocations from HOW LIFE BEGAN ON THE EARTHa cloud of energetic dust具有能量的尘埃, combine into合成, move around the sun环绕太阳运转, become violent变得激烈, the solid surface固体表面, explode loudly猛烈爆炸
10、, in time及时，最终, produce the water vapor产生水蒸汽, make the earths atmosphere构成了地球的大气层, cool down冷却, on the surface在表面, be different from与不同, go round the sun环绕太阳运转, disappear from从消失, stay on存留在, show ones quality显现某人的特性, dissolve harmful gases分解，溶解有害气体, become part of变成的一部分, develop life发展生命, grow in t
11、he water在水里生长, fill with用来填充，充满了, encourage the development of鼓励的发展, millions of years later几万年以后, live on land在陆地上生活, live in the sea在海里生存, grow into forests长成森林, produce young生出幼仔, lay eggs下蛋, animals with hands and feet长着手脚的动物, spread all over the earth遍布全世界, develop new methods发展了新的方法, grow food
12、种植, move around迁徙, go by过去，推移, take care of在意，照看好, putinto把带入，放入, preventfrom防止做, escape from into从逃离到, become hot变热, depend on.依靠，依赖，取决于, solve a problem解决一个问题3. Reading and transferring informationRead the passage carefully and analyze its structure. Write down the main idea for each paragraph.Mai
13、n BodyParagraph 1: A widely accepted theory about the formation of the universeParagraph 2: The formation of the earthParagraph 3: The importance of water for lifeParagraph 4: The development of plants and animals on the earthParagraph 5: The arrival of humans and their impact on the earth4. Reading
14、 and understanding difficult sentences Skim the text and identify the difficult sentences of each paragraph. You may put your hand up if you have any questions. Notes to some difficult sentences通过了解文章的大意，较难的在于分析某些长难句，这有利于学生提升阅读能力和写作表达能力。在这个阶段，把例句逐个展现在屏幕上，通过老师设定的动画顺序，一步步分析。还可以设置相关的例句练习。1. After the “
15、Big Bang ” the earth was just a cloud of energetic dust.随着“轰隆”一声巨响，地球就成为一个云团，充满着具有能量的尘埃。Big Bang(big-bang cosmology) 大爆炸宇宙学。2. It exploded loudly with fire and rock. They were in time to produce carbon dioxide, nitrogen water vapour and other gases, which were to make the earths atmosphere. 它（地球）巨大的
16、爆炸喷出了烈火与岩石，最终产生了水蒸汽、二氧化碳、氧、氮和其他多种气体，从而形成了地球的大气层。in time: sooner or later; eventually 迟早；最后。Ill see him in time. 总有一天我会遇见他。in time(for sth/ to do sth) : not late 及时；不迟。She will be back in time to prepare dinner. 她来得及回来准备晚饭。in/out of time: in/not in the correct time 合/不合节怕。The audience clapped in time to the music
