冀教初中英语九上《Lesson 29 DNA—The Story of You》PPT课件 (3).ppt

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1、Lesson 29,DNA-The Story of You,Think about it!What do you know about DNA?2. What can scientists do with DNA?,Presentation:,This is the shape of DNA. Do you think its magic?,“DNA” is short for deoxyribonucleic acid.,The two girls are twins. Maybe they have the identical DNA. identical（adj) -identify

2、(v.),Why?,Fang Zuming looks like his fatherCheng Long.,Read the lesson and answer the questions：,What is a blueprint?Which is more complex, building a living thing or building a house?Do some twins have the same DNA?Is it possible to change your DNA?Whose DNA is related to yours?,Language Points:,1.

3、Are there differences between you and them? 你和他们之间有什么不同吗?【辨析】between与amongbetween常用于两者之间，among一般指三者或三者以上.Jack sits between Lin Tao and Bob.I was among the crowd. 我处在人群中。,2.You use it to build a house.你用它来建造房子。use的用法 useto do sth. 用做某事He is using a knife to cut bread. 他正用小刀切面包。【注意】 use的形容词是useful，它是由

4、use加后缀-ful构成的。如：Is the fridge very useful? 这台冰箱很有用吗？,3.DNA is a pattern, too. DNA也是一种模型。 too表示“也”时,通常置于句末，其前用逗号隔开。【辨析】too与either too与either都表示“也”，其区别是too用于肯定句，表示“也”；either用于否定句，表示“也不”。他们通常都位于句末，其前用逗号隔开。如：He has a sister, too. 他也有个小妹妹。He doesnt have a knife, either. 他也没有小刀。,4. Except for identical tw

5、ins, each living thing has its own unique DNA. 除了同卵双胞胎之外，每个生物都有它唯一的DNA。1)except for除以外，只是He is a good man except for hot temper. 除了脾气暴躁外，他是个好人。,2)own的用法adj. 自己的（用在所有格后面，加强语气） She makes all her own clothes. 她所有的衣服都是自己做的。vt. 有；拥有 Who owns the bike? 这辆自行车是谁的？【友情提示】owner n. 所有人；物主He is the owner of the

6、house. 他是这座房子的主人。,Practice:,Fill in each blank with the proper word.1. This is the _(identify) hotel that we stayed in last year. 2. Your brothers are people _(relate) to you.3. Do you know who is the _(own) of the house?4. Your body uses this pattern _ (build) itself.5. You have your own DNA, but i

7、t repeats the patterns from your _(parent) DNA. 6. Some health problems come from your familys DNA. _(science) can look for these problems in your DNA.,identical,related,owner,to build,parents,Scientists,根据汉语意思完成句子，每空一词：1. 我们用蓝图建造房子。 We _ a blueprint _ _ a house.2. 除了窗子小外,这座房子很漂亮。 The house is beautiful _ _ the small windows.3. 你的头发和皮肤有同样的DNA。 Your hair has _ _ _ _ your skin.4. 她不但会唱歌，而且会跳舞。 She can _ _ sing _ _ dance.,use,to build,except for,the same DNA as,not only,but also,HomeworkMake a summaryWhat have you known about “DNA” now? What can scientists do with DNA?,