Unit 5 Lesson 29 DNA—The Story of You 课件(共19张PPT) 冀教版九年级英语全册

(共19张PPT)
DNA
脱氧核糖核酸
What do you know about DNA
What can scientists do with DNA
Unit 5 Look into Science
Lesson 29 DNA - The Story of You
The new words
blueprint [ blu pr nt]
n. 蓝图
general [ d enr l]
adj. 一般的:普遍的
complex [ k mpleks]
adj. 复杂的
twin [tw n]
n. 双胞胎之一;孪生儿之一
repeat [r pi t]
v. 重复;复述;背诵
pattern [ p tn]
n. 模式;形式
identify [a dent fa ]
v. 确认;鉴别
related [r le t d]
adj. 有关的;相关的
grandson [ ɡr ns n]
n. 孙子;外孙
granddaughter [ ɡr nd t (r)]
n. 孙女；外孙女
instruction [ n str k n]
n. 指示;说明
instruct [ n str kt]
v. 指示;说明
The text
This is the shape of DNA.
Do you think it's magic
When you build a house, you use a
blueprint.What's a blueprint In general,
a blueprint is a drawing that shows how
to put a house together with many different
parts. DNA is the blueprint of life.
But building a living thing is far more complex than building a house. It takes millions of years for nature to change the DNA in living things to make them fit the world they live in.
How tall are you What colour are your eyes What size are your feet All these things are strongly influenced by your DNA before you are born!
DNA is fantastic!
● Except for some twins, every living thing has its own unique DNA.
● Some health problems can be caused by problems in your DNA. Scientists can look for these problems and, sometimes, help you before you become sick. In the future, scientists might be able to change your DNA.
● There are copies of your DNA in every part of your body. For example, your finger has the same DNA as your hair.
● You have your own unique DNA, but it repeats patterns from your parents’DNA. From your DNA, scientists can identify not only you, but also people who are related to you. Your parents and grandparents are related to you, and you have their DNA.When you have a grandson or granddaughter, he or she will have your DNA.
Your DNA has billions of instructions that explain why you are the way you are. It's one of the most amazing things on the earth!
知识点讲解
1. In general, a blueprint is a drawing that shows how to put a house together with many different parts.
general [ d enr l]
adj. 一般的:普遍的
in general
一般而言；通常
（常用于句首，逗号隔开）
= generally speaking
2. But building a living thing is far more complex than building a house.
far 用来修饰比较级
常见修饰比较级的词：
much, still, even, a little, a bit, a lot, rather, any
3. All these things are strongly influenced by your DNA before you are born!
be influenced by
受……的影响
influence v.影响
（被动语态）
influence n.影响
have an influence on sb./sth.
对……有影响
4. Except for some twins, every living thing has its own unique DNA.
except
prep.除...之外
除了星期日，这间办公室每天都开放。
The office is open every day except Sunday.
except for
除...之外
可用于句首
除了Tom,所有学生都可以去。
Except for Tom, all the students can go.
拓展比较
besides
除...外(还）
（除去部分包含在整体范围内）
除你之外，我还有好几个好朋友。
I have a few good friends besides you.
besides 还有“此外，况且”的含义
我不想去，况且我太累了。
I don’t want to go,besides, I’m too tired.
5. Some health problems can be caused by problems in your DNA.
be caused by
由...引起
6. Your parents and grandparents are related to you, and you have their DNA.
be related to
与...有关
related adj. 有关联的
relate v. 使有联系
练一练
（ ）1.I like music and people _______ can make me happy.
A. which B. that C. who D. what
（ ）2.There are _____ stars in space. I want to know which one is the nearest to us.
A. billion of B. billions C. billions of D. billion
（ ）3.What will you do 　　　 the old books
A.to B.with C.about D.for
（ ）4.Keep Running is a very relaxing TV program 　　　　is still hot among teenagers.
A.which B.what C.who D.when
B
C
B
A
(　)5.Ben′s composition is almost perfect 　　　　several spelling mistakes.
A.except B.except for C.besides D.beside
( )6.A break between classes is a good time for students to play sports and talk with their classmates. So it　　　　 helps with students′ health, 　　　　
improves their social skills.
A.either; or B.neither; nor C.not only; but also D.both; and
A
C
( )7.—Mum, I’ve signed for a big box by Future Express(快递). What's in it
—I'm not sure. It________ be a present from your brother.
A. might B. must C. should D. will
( )8.—Wow, a HUAWEI Mate 30, what a big surprise! Thanks, darling!
—It's your birthday present. But please read the _____ carefully before you use it.
A. information B. instructions C. invitations D. instruments
A
B
Bye-bye