冀教版九年級上冊英語 Unit5 Lesson 29 DNA---The Story of You教學(xué)設(shè)計

1、Lesson 29: DNAThe Story of YouI. Learning aims:Master the new words: DNA, blueprint, general, complex, twin, copy, repeat, pattern, identify, related, grandson, granddaughter, instruction II. Learning important and difficult points: 1) In general, a blueprint is a drawing that shows how to put a hou

2、se together with many different parts.2) But building a living thing is far more complex than building a house.3) Except for some twins, every living thing has its own unique DNA.4) From your DNA, scientists can identify not only you, but also people who are related to you.5) Your DNA has billions o

3、f instructions that explain why you are the way you are.Language Points:1. copy【用法】作可數(shù)名詞，意為“復(fù)制品、一本、一冊”，復(fù)數(shù)形式是copies?！九e例】 = 1 * GB3 This is just a copy. Have you found it? 這只是一個復(fù)制品。你發(fā)現(xiàn)了嗎？ = 2 * GB3 I borrowed two copies of magazines from the library. 我從圖書館借了輛本雜志?！居梅ā孔骷拔飫釉~，意為“復(fù)制、抄寫”，后加名詞或代詞作賓語?！九e例】Have

4、 you finished copying the words? 你抄寫完單詞了嗎？【應(yīng)用】根據(jù)括號中所給漢語用適當詞語填空。We dont need any _（復(fù)制品）. Write them by hand.答案：copies。表示“復(fù)制品”用名詞copy，且這里是復(fù)數(shù)形式。2. repeat【用法】作及物動詞，意為“重復(fù)、重述”， 后加名詞或代詞作賓語。【舉例】What about repeat the text for another time? 再重復(fù)一遍課文怎么樣？【拓展】在口語中，當沒聽清對方的話或沒看清對方的動作要求對法重復(fù)時，為了表示客套，要用Pardon？或 Beg yo

5、ur pardon? 或I beg your pardon?【舉例】Pardon? I didnt hear your words clearly. 請重復(fù)一遍好嗎？我沒聽清你的話?！緫?yīng)用】根據(jù)括號中所給漢語用適當詞語填空。The teacher _（重復(fù)）the sentences and I knew its meaning at last.答案：repeated。表示“重復(fù)”用動詞repeat，且這里是一般過去時。語句詳解1. But building a living thing is far more complex than building a house. 但是構(gòu)建一個有生命的

6、東西比建一座房子復(fù)雜得多?！居梅ā勘容^級前可以用much, even, still, far, a bit, a little, a lot 等詞加以修飾?！九e例】 = 1 * GB3 This unit is much easier than that one. 這個單元比那個單元容易得多。 = 2 * GB3 This book is far more interesting than that one.這本書比那本書有趣得多。答案：a little taller。此處用副詞a little作狀語，修飾后面的比較級taller。2. Except for some twins, every

7、 living thing has its own unique DNA. 除了一些雙胞胎外，所有有生命的東西都在自己獨特的DNA。【用法】except for用于表示對主要部分的肯定和對局部的否定。它不表示同類事物之間的關(guān)系，其意思是“除了以外、除去為了、如果不是”?！九e例】 = 1 * GB3 Smith is a good man, except for his bad temper. 史密斯除了脾氣不好外，是個好人。 = 2 * GB3 Mother wouldnt give him any money except for books and stationery. 除了買書和文具外

8、，媽媽不給他任何錢。 = 3 * GB3 Except for you, I would pass the exam. 如果不是你，我就會通過考試。3. From your DNA, scientists can identify not only you, but also people who are related to you. 根據(jù)你的DNA, 科學(xué)家不僅能辨別出你，而且能辨別出與你有關(guān)系的人?！居梅ā縩ot onlybut also是等立連詞，意思是“不但而且”，它可以連接句中句子成分相同的部分，如果用它連接主語時，謂語動詞應(yīng)該以but also后面的主語為準?！九e例】 = 1 * GB3 She can sing not only Chinese songs but also English songs. 她不僅會唱中文歌曲，還會唱英文歌曲。 = 2 * GB3 Not only I but also she has finis