冀教版九年级全册Unit 5 Look into Science Lesson 29 课件(共23张PPT，内嵌音频)

(共23张PPT)
Lesson29 DNA-The Story of You
Unit 5 Look into Science
Lead-in
Think about it
1.What do you know about DNA
2.What can scientist do with DNA
Lead-in
twins
Words and expressions
DNA blueprint
general complex
twin repeat
脱氧核糖核酸
n.蓝图
adj. 一般的，普遍的
adj.复杂的
n.双胞胎之一
v.重复，复述，背诵
Words and expressions
pattern identify related grandson granddaughter instruction
n.模式，形式
v.确认，鉴别
adj.有关的，相关的
n.孙子，外孙
n.孙女，外孙女
n.指示，说明
Main phrases:
·in general
·except for
·be related to
·billions of
Listen to the tape and find out the new words and phrases in the text.
Language points
1.What can scientists do with DNA
do with“处理”,与疑问词what连用。
deal with“对待,处理”,与疑问词how连用。
eg:What did you do with that book
How did you deal with that book
2.In general,a blueprint is a drawing that shows how to put a house together with many different parts.
◆in general=generally speaking“一般而言,概括说来”
I like butterflies in general.
3.But building a living thing is far more complex than building a house.
◆living为形容词,意为“活着的,活的”,常作定语。
◆far 副词,“非常,远远”,用来修饰形容词和副词的比较级,表示程度。
修饰比较级的词还有：even“甚至”;rather“相当”;much“……得多”;a little/bit“有点”;a lot“……得多”
4.Except for some twins,every living thing has its own unique DNA.
【辨析】　 except for,except,besides,but
(1)except for“除了”,表示对主体的肯定和局部的否定(2)except“除了……之外”,从整体中排除该部分。
(3)besides“除……之外，还有”,表示后面内容包含在整体中
(4)but“除……之外”,常与no,nothing,none,nobody等词连用。
巩固练习
1.We all went there ________Tom.
2.He is a good man____________the hot temper.
3.I have five books ____________ this.
4.There is nothing ________ a desk in the room.
except
except for
besides
but
5.◆every adj.,“每一的,每一个的” ,强调整体概念,不能直接与of连用,指三者及以上中的每一个。
each adj.“每个的”;pron.“每个”。作主语时,谓语动词用单数;强调个体,可与of连用,指两者及以上中的每一个。
【注意】“every/each+单数名+and+every/each+单数名词”结构作主语时,谓语动词用单数形式。
6.Some health problems can be caused by problems in your DNA.
◆health为不可数名词,意为“健康”,常构成短语in good/bad health,意为“健康/不健康”。
【拓展】
(1)healthy adj.,“健康的”;
unhealthy“不健康的”
keep/stay healthy“保持健康”。
(2)healthily adv.,“健康地”,
eat healthily“吃得健康”。
7.In the future,scientists might be able to change your DNA.
be able to=can “能,会”,可用于各种时态,+接动词原形。
be unable to=can’t “不能”
eg:I can speak English.
8.From your DNA,scientists can identify not only you,but also people who are related to you.
◆be related to“和……有联系,和……有关,与……有亲戚关系”。
related adj.,“有关的,相关的”
relate v.,“把……联系起来”,常与to或with搭配。
eg:They are related to each other.
I can’t relate what he does to what he says.
9.It’s one of the most amazing things on the earth!
one of the most amazing things“最令人惊奇的事情之一”
“one of the+形容词的最高级+复数名词”其中定冠词the也可使用形容词性的物主代词来代替。
Ⅰ.Fill in the blanks with the phrases in the box.
in general,except for,not only…but also,
related to,even if,the same…as…
1.Your homework is quite good　　　　 a few spelling mistakes.
2.　　　　 the young　　　　 the old like pop music.
3.Kate’s hair is　　　　 colour　　her sister’s.
4.　　　　 ,women live longer than men.
5.　　　　 many difficulties remain,we can
overcome them.
6.Is wealth　　　　 happiness
except for
Not only but also
the same as
In general
Even if
related to
Practice
II.用适当的词填空
1. Everyone wrote a good poem _______ her. (除了)
2. _________ Tom, five other boys also passed the exam. (除了…还有)
3. ____________ identical twins, (除……之外) each living thing has its own unique DNA.
except
Besides
Except for
4. All the questions are easy _______ the last one. (除了)
5. There are many others _________ me.
(除了……还有)
6. We all went to Beijing ________ Tom, who has been there before.
except
besides
except
Ⅲ.同义句转换
1.Both you and Linda give us a big surprise.
　　　　　you　 　　　Linda　　　us a big surprise.
2.It takes me half an hour to clean up my room.
I 　　　　half an hour　　　　 up my room.
3.My book isn’t the same as his.
My book is　 　　　 his.
4.What do you do with this problem
　　　　do you　　　　with this problem
5.He can speak Chinese.
He is 　　　　speak Chinese.
6.I don’t know how I could build a house.
I don’t know how　　　　 　　　　a house.
Not only but also
spend cleaning
different from
How deal
to build
able to
gives
Homework
1.Finish off the remaining exercises in the activity book.
2.Preview the next lesson in the student’s book.
Thank you!