2013人教版必修三unit 4《astronomy the science of the stars》word学案.doc

1、Book 3 Unit 4 Astronomy：the science of the stars .关键词汇 1The hen was old and it stopped_(下蛋)eggs. 2. The idea_(存在)only in the minds of us young people. 3Do you think our education_( 制度)needs improving? 4The_(气候 )of southern Florida attracts thousands of tourists each winter. 5Without practice there w

2、ould be no_(理论) 6Professor Li has solved the_(难题)and everyone is cheering. 7Mars_(万有引力 )is only about 38% of Earths. 8Raising your child to tell the difference between right and wrong is one of the f_tasks of parenthood. 9用 harm 的适当形式填空 (1)Air pollution will get worse and this will be_to people，for

3、example，it can cause cancer. (2)Rubbish can be changed into_things. (3)Dont_your eyes by reading in the dim light. 10. Last night we had a discussion，which became more and more_.Finally we reached an agreement that we will never use_whatever happens.(violent) 关键短语 1_ 下蛋 2_ 及时，终于 3_ 产生；分娩 4_ 轮到某人；接着

4、5_ 阻止；制止 6_ 挡住(光线) 7_ 感到高兴；感到振奋 8_ 既然 9_ 突发；爆发 10_ 密切注视；当心；提防 重点句式 1_was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. 随后它会变成什么没有人知道，直到 3845 亿年前，这团尘埃才慢慢地形成一 个固体的球状物。 2The earth became _ it was not clear whether the shape would last or not. 地球变得如此猛烈，以

5、至于它的形状能否持久还不清楚。 3This produced a chain reaction，which _. 这就产生了一系列的反应，使得生命有可能发展了。 4We watched，_ on the outside of the spaceship as the earths gravity increased. 我们惊奇地看着，随着地球引力的增加，宇宙飞船的外层燃烧起火。 5But when I tried to step forward，I found I was carried _ on the earth and fell over. 而当我试着向前迈步时，我发觉我被送出很远，步子

6、的跨度竟是在地球上的两 倍，因而我摔倒了。 6 “.walking does need a bit of practice _ gravity has changed.” “既然重力改变了，走路也确实需要练一练了。 ” .知识详解 1.exist vi. 存在，生存 (回归课本 P26)They laid eggs too and existed on the earth for more than 140 million years. 它们也生蛋，在地球上生存了一亿四千多万年。 例句探源 They cant exist on the money hes earning. _ There ex

7、ists a good way to solve the existing problem in geography. _ No one knows how this world came into existence. _ 即境活用 1完成句子 (1)巴基斯坦在战后就以一个独立的国家存在了。 Pakistan _ _ _ _ _ _country after the war. (2)就我所知，他们收入微薄，几乎无法维持生活。 As far as I know，they are paid hardly enough_ _ _. 2.puzzle n 谜；难题 vt. she needs che

8、ering up. _ The good news cheered (up) everybody who heard it. _ The crowd cheered wildly at the sight of Liu Xiang. _ They do this in order to encourage crowds to cheer their sports teams. _ 即境活用 Im thinking of the test tomorrow.Im afraid I cant pass this time. _！Im sure youll make it. AGo ahead BG

9、ood luck CNo problem DCheer up 8. harmful adj. 有害的 =harm n.没有恶意 harm ones image/reputation 损害某人的形象/名声 do more harm than good 弊大于利 There is no harm in (ones) doing sth. =It does no harm (for sb.) to do sth. (某人) 做某事无害处 即境活用 He is a nice dog. He wont do you any .（原创） A. ill B. bite C. hurt D. harm .句型

10、梳理 1【教材原句】 “.walking does need a bit of practice now that gravity has changed.” (P31) “既然重力改变了，走路也确实需要练一练了。 ” 【句法分析】 now that 由于；既然，引导原因状语从句，有时 that 可以省略。 例句探源 Now that you have finished your work，youd better have a rest. _ Now (that) the weather is fine，lets go for a ride. _ Now you have grown up，y

11、ou can make up your mind by yourself. _ 易混辨析 now that，since，as，for， because (1)now that 既然，与 since 含义相近，语气较弱，强调人们已知的事实。 (2)since 侧重主句，从句表示显然的或已为人所知的理由， 常译为“因为 ”或“既然”，语气比 because 稍弱，通常置于句首，表示一种含有 勉强语气的原因。 (3)as 语气比 because 弱，所引导的从句表示的是显而易见的原因和理由，从句 一般放在主句前。 (4)for 是并列连词，表示推断的原因，或对前一分句补充说明理由。for 表示这 一

12、用法时需放在两句之间。 (5)because 语气最强，一般指事情发生的直接原因，回答提问时，一般放在主句 之后。 例句探源 He was absent from the meeting because he was ill yesterday. _ Since you cant answer the question，Ill ask someone else. _ As there was no answer ， we wrote him again. _ It must have rained last night，for the ground is wet. _ 即境活用 (1)_you

13、ve got a chance，you might as well make full use of it. ANow that BAfter CAlthough DAs soon as (2)Did you return Freds call? I didnt need to_Ill see him tomorrow. Athough Bunless Cwhen Dbecause 2【教材原句】 But when I tried to step forward，I found I was carried twice as far as on the earth and fell over.(

14、P31) 而当我试着向前迈步的时候，我发觉我被送出去很远，步子的跨度竟是在地球 上的两倍，因而我摔倒了。 【句法分析】 倍数的表达方式。 (1)倍数形容词/副词比较级 than. Eg. This ruler is twice longer than that one. _ (2)倍数as形容词/副词 as. Eg. There are four times as many students as we expected. (3)倍数the表示衡量的名词 (the size/weight/length/depth/width.)of. Eg. My house is twice the siz

15、e of my parents (4)倍数more进行比较的名词 than. Eg. There are five times more books in our library than in yours. _ (5)倍数as many/much进行比较的名词as. Eg. Our city has experienced twice as much rain this year as it did last year. _ (6)倍数that of被比较对象 Eg. In this workshop, the output of July was 3.5 times that of Jan

16、uary. _ (7)A倍数 what 从句。 Eg. The production now is three times what it was ten years ago. 即境活用 (1)这个大厅比我们的教室大 5 倍。 This hall _our classroom. This hall _our classroom. This hall_of our classroom. (2)今年我们生产的棉花比十年前多了一倍。(汉语中的多一倍实际上也指两倍一 样多。) Weve produced _ (we did) ten years ago. (3)我们班学生人数比他们班多两倍。 Ther

17、e are _than in theirs. （4） (2009 年高考辽宁卷)Peters jacket looked just the same as Jacks，but it cost_ his. Aas much twice as Btwice as much as Cmuch as twice as Das twice much as （5） Ten years ago the population of our village was _that of theirs. Aas twice large as Btwice as large as Ctwice as much as D

18、as twice much as 3. What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe. （P25） 随后它会变成什么没人能知道，直到 3845 亿年前，这团尘埃才慢慢地形成一 个固体的球状物。 （1）What it was to become .是 what 引导的主语从句，what 在从句中作 become 的宾语。 例句探源 What surprised everybody was that he

19、 didnt come to the meeting. What he did added to our difficulty. （2） “be+动词不定式”在本句中表示按照计划、安排将要发生的动作。 例句探源 When are they to hand in their plan? You are to do your homework before you watch TV. “be+to”还可以表示以下含义： 表示可能性，相当于 can,主要用于疑问句和否定句。表示命令，意为 “必须，不 得不”，意思等同于 must, have to，表示假设。表示“命运注定”，通常用于 过去时。 Ho

20、w am I to know what has become of him? 我怎么知道他的遭遇如何呢？ Certain skills must be learned if one is to use English well. 如果想要用好英语，某些技巧是必须学的。 He was never to see his wife again. 他注定再也见不到他妻子了。 Were we to offer you more money, would you stay? 如果我们给你加钱，你愿意留下吗？ 即境活用 In dry weather the flowers will have to be watered if they . A. have survived B. are to survive C. would survive D. will survive