课件44张PPT。 DNA－The Story of You Lesson 29 Look into Science Unit 5课文呈现知识讲解………… Lesson 29
DNA－The Story of You 词汇
听写课堂导入课文1课后作业…课堂小结课堂练习 同学们，上一课学习的单词你们都掌握了吗？现在大家来检验一下，点击下面的音频开始听写吧！What do you know about DNA?THINK ABOUT IT·What do you know about DNA?
·What can scientists do with? DNA? 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!This is the shape of DNA. Do you think it’s magic?Your DNA comes from your parents. do with 处理 考向do with与deal with都可表示“处理”。do with常与what连用，而deal with常与how连用。
eg：I don’t know what they do with the problem.
我不知道他们如何处理这个问题。知识点1 in general 通常；大体上考向generally adv.一般地；广泛地；普遍地。generally speaking“大体而言；概括来说”。
eg：Generally speaking，your idea is right.
总的来说，你的想法是正确的。知识点2eg：In general，their cars are very reliable.
通常，他们的小汽车是很可靠的。典例________，it is not very bad to work in this factory.
A．General speak B．Speaking generally
C．In general D．In generally【点拨】句意：通常来说，在这家工厂工作还是不错的。
In general通常来说。故选C。C 开门见山法：此句是一个主旨句，整个段落围绕DNA写作，接下来整个文章都是围绕其写作的。 知识点3except for 除……之外 知识点4eg：Your article is quite good except for several
spelling mistakes.
除了几处拼写错误，你的文章很好。考向辨析 except，except for，besides与but eg：Everybody except John was able to answer.
除了约翰外大家都能回答。
He is a good man except for a bad temper.
除了他的坏脾气，他是个好人。
I have another blue pen besides this one.
除了这支外，我还有一支蓝色钢笔。
They all have gone but me.
除了我他们都去了。 典例 1—Is Jack good at basketball?
—Yes. He is also good at table tennis
________basketball.
A．except B．besides
C．but D．beside【点拨】except表示“除了…… ”，不包括所除事物在内；besides表示“除……之外还有”，包括所除事物在内；but “除……外”，但常用在no，nobody等词之后；beside表示“在……旁边”。根据句意“——杰克擅长篮球吗？——是的。除了篮球外他也擅长乒乓球。”可知Jack既擅长篮球也擅长乒乓球。故选B。B典例 2Ben’s composition is almost perfect ________ several spelling mistakes.
A．besides B．except for
C．but D．beside【点拨】句意：除了几处拼写错误之外，本的作文几乎是
完美的。前面是对整体情况的说明，后面再对细节上进
行修正。故选B。 B sometimes/'s?mta?mz/ adv.有时，时而考向【易错点】知识点5eg：I sometimes walk to school.
我有时步行去上学。 辨析 sometimes，sometime，
some time与some times 典例He said he would come to see us________ the next day.
A．sometime
B．sometimes
C．some times【点拨】sometime在某时；sometimes有时；some times
几次。由句意可知应选A。A the same…as 和……一样 考向一知识点6eg：She wears the same clothes as her sister.
她穿着同她妹妹一样的衣服。same常与定冠词the连用。be the same... as
反义短语be different from...“与……不同”。
eg：They are the same age as us.
他们和我们同岁。
The English book is different from yours.
这本英语书与你的那一本不同。all the same虽是这样；尽管如此
eg：He gives me a lot of trouble，but I like him
all the same.
他给我添了许多麻烦，但我还是喜欢他。 考向二 not only...but also...不但……而且…… 考向一知识点7not only...but also...用于连接两个并列的成分，
着重强调后者。
eg：Not only Ma Lin but also Ma Long plays
ping-pong very well.
不但马琳而且马龙乒乓球打得也很好。
(连接两个并列的主语)not only...but also...连接两个并列主语时，谓语动词要与它最近的主语保持人称和数上的一致，即“就近原则”。
eg：Not only the boy but also his parents are staring
at the screen.不但那个男孩而且他的父母也正
在盯着屏幕。 考向二典例—To achieve a bright future，we should ________
study hard ________ keep in good health.
—I agree with you. (云南)
A．not; but B．not only; but also
C．neither; nor D．either; or【点拨】—为了实现光明的未来，我们不仅应该努力学习，
而且应该保持身体健康。——我同意你的观点。 not…but
表示“不是……而是”；not only…but also…表示
“不但……而且……”；neither...nor 表示“两者都 不”；
either...or 表示“或者……或者”。故选B。B one of … ……之一 考向【重点】知识点8 one of… 意为“……之一”，后接
可数名词复数作主语时，谓语动词用单数。
如有形容词修饰one of后的名词时，形容词
一般用最高级形式，最高级前应有定冠词the
或形容词性物主代词。eg：He is one of my best friends.
他是我最好的朋友之一。
One of my friends lives in Beijing.
我的一个朋友住在北京。典例Chiang Mai (清迈) has been one of ________tourist places for Chinese since the movie Lost in Thailand (《泰囧》) was shown. (山东东营)
A．hot B．hotter
C．hottest D．the hottest【点拨】考查“one of＋the＋形容词的最高级＋名词复数”的用法，意为“最……的……之一”，故选D。 D1.Read the lesson and answer the questions.
1．What is a blueprint?
2．Which is more complex，building a living thing or
building a house?
3．Do some twins have the same DNA?
Let's Do It !A blueprint is a drawing that shows how to put
a house together with many different parts. Building a living thing. Yes, they do.
4．Is it possible to change your DNA?
5．Whose DNA is related to yours?
Yes. In the future, scientists might be able to
change our DNA. My parents’ and my grandparents’. 2.Fill in the blanks with the phrases in the box. in general except for not only…but also
related to even if the same…asLet's Do It !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 onlythe sameIn general Even if related to but also as 3.Complete the passage with the sentences in the
box.Changing DNA
Do you know DNA can be changed? Have you ever seen a pig with a dog’s body? Of course not! Pigs and dogs can’t have babies together. ______But now，scientists can do it. Scientists can take DNA , from one kind of animal and put it into another kind of animal. They can design new plants ALet's Do It !By ? combining the DNA of other plants.________ Some
scientists are worried. They say we need to know more
about DNA before we start changing it.________ But what
if the plants are bad for humans，too?C B 4. Is it a good idea to change the DNA of the food
we eat? Some people say doing this makes our
food better. Others think it’s too dangerous.
Search the Internet for information and write
down your ideas.Let's Do It !by/ba?/ prep. 通过…… 考向知识点9eg：I learn English by listening to the radio.
我通过听收音机学习英语。by意为“用来；靠；通过”，表示方式或途径。
eg：They make their living by selling fish.
他们以卖鱼为生。典例You can improve your English ________ practicing more.(重庆A)
A．by B．with
C．of D．in【点拨】本题考查介词的用法。by表示方式，“通过”；
with“用；和……在一起”；of“关于；属于……的”；
in“在……里”。由句意“你可以通过多练习提高你的英语。”可知，by表示方式，符合题意。 A 本节课主要学习了以下重点内容:
（1）重点单词：sometimes, by等。
（2）重点短语：do with, in general, except for,
the same… as, not only…but also…,
one of…等。一、根据句意及首字母提示完成单词
1．Lucy and Lily are ______．They look the same.
2．In ________，women do it more easily than men.
3. It’s important for you to ________the text.
4．Mike has a granddaughter and a ________．
5．Before you take this medicine, you must read the
_____________.tgeneral wins repeat grandson nstructionsi二、单项选择
6．What did the police ________ that accident?
A．deal in B．deal with
C．do with D．do about
7．My article is good ________some spelling mistakes.
A．except B．except for
C．Beside D．besides CB8．From your DNA，scientists can identify you and the
people ________to you.
A．related B．relates
C．relating D．relate
9．(中考·六盘水) Not only you but also he _____ the
secret.
A．knows B．know
C．have known D．to knowAA10．(中考·龙东) —Jack, your room is dirty. It should
________ right away.
—Sorry, I’ll do it right now.
A．be cleaned B．be cleaning C．cleanedA三、根据汉语意思完成句子
11．他和我家有亲戚关系。
He _______ ________ ________ my family.
12．凯特和她姐姐有同样颜色的头发。
Kate has ________ ________colour of hair
________her sister.the same asis related to 13. 数十亿年前，地球只是一团尘埃。
________ ____years ago, the earth was just a cloud of dust.
14．他的话对她有很大影响。
She was ________ ___________ by his words.
15．(中考·盐城)李明不仅聪明而且勤奋。
Li Ming is________ ________ ________ ________
________ ______________．strongly influenced Billions of not only clever but
also hard-working 1.熟记本课时的词汇
2.完成本课时的课后作业
