2019版高考英语一轮复习 Unit 4 Astronomy the science of the stars课件 新人教版必修3.ppt

1、 Book 3 Unit 4 Astronomy: the science of the stars 语言点用法过关 1. harmful adj.有害的 教材原句 What many scientists believe is that the continued presence of water al- lowed the earth to dissolve harmful gases and acids into the oceans and seas. 很多科学家相信 ,由于地球上长期有水存在 ,使地球得以把有害气 体和酸性物质溶解在海洋里。 语境应用 单句填空 As we all

2、know, a bad eating habit is harmful (harm) to ones health. As far as Im concerned, there is no harm (harmful) in making an apology to him first. 一句多译 那时我意识到浪费时间玩电脑游戏对我的学习和健康是有害的。 (2015重庆写作一 ) Then I realized that wasting time in playing computer games .( ).( ).( )harm fuldo harm tobad? was harmful t

3、o my study and health did harm to my study and health was bad for my study and health 用法点拨 (1)be harmful to.对 有害 (2)harm n. 损害 do harm to sb.=do sb. harm 对某人有害 There is no harm in doing sth. 做某事没有坏处 (3)harmless adj. 无害的 2. exist vi.存在 ;生存 教材原句 They laid eggs too and existed on the earth for more tha

4、n 140 million years. 它们也下蛋 ,并且在地球上存在了 1亿 4千多万年。 语境应用 单句填空 Even though he is a little boy, strange ideas always exist in his mind. The old lady became seriously ill last week;she has only existed on milk ever since. There exists (exist)a good way to solve the problem at present. 完成句子 Scientists have

5、many theories about how the universe came into existence . 关于宇宙是如何产生的 ,科学家们有多种学说。 用法点拨 (1)exist in 存在于 之中 exist on 靠 为生 There exists/existed.某地有 (2)existence n.存在 ;生存 in existence 存在 come into existence 产生 ;开始存在 点津 exist是不及物动词 ,没有被动语态 ,也不用于进行时态。 3. puzzle v.使迷惑 ;使为难 ;使困惑 n.谜 ;难题 教材原句 How life began

6、on earth is one of the biggest puzzles that scientists found hard to solve.地球上生命的起源是科学家们难以解决的最大疑惑之一。 语境应用 单句填空 The police are still puzzling about/over how the accident happened. Ive been trying to puzzle out why shes so upset. Tom seemed puzzled (puzzle)about what the question meant. 单句改错 Her puzzl

7、ing look on her face suggested she didnt understand what I said. puzzlingpuzzled 用法点拨 (1)puzzle over/about sth.苦苦思索 puzzle sth. out 琢磨出 的答案 (2)puzzled adj. 迷惑不解的 (常用来修饰人或人的表情 ) puzzling adj. 令人迷惑的 (常用来修饰事物 ) 1. in time 及时 ;终于 ;迟早 ;最后 教材原句 They were in time to produce carbon dioxide,nitrogen,water va

8、pour and other gases,which were to make the earths atmosphere. 它们最终产生了 二氧化碳、氮气、水蒸气和其他气体 ,从而形成了地球的大气层。 语境应用 写出下列各句中 in time的含义 Andy knew he could not reach the house in time. 及时 Youll succeed in time because you are always working hard. 迟早 Working hard made him successful in time. 最后 句型转换 The activity is so meaningful that we will never forget it. The activity is so meaningful that at no time will we forget it. (用 at no time改写 ) 用法点拨 in no time立刻 ;马上 at no time决不 (放在句首时 ,句子用部分倒装 ) at a time每次 ;依次 at one time曾经 ;一度 at the same time同时 from time to time有时 ;偶尔 take ones time别着急 ;慢慢来 kill time消磨时间