《DNA-The Story of You》Look into Science! PPT下載
第一部分內(nèi)容：This is the shape of DNA.
“DNA” is short for deoxyribonucleic acid.
The two girls are twins. Maybe they have the identical DNA.
Fang Zuming looks like his father—Cheng Long.
New Words
DNA blueprint
general complex
twin repeat
pattern identify
related grandson
granddaughter instruction
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DNA-The Story of YouPPT，第二部分內(nèi)容：Read the lesson and answer the questions.
(1)What is a blueprint?
A blueprint is a drawing that shows how to put a house together with many different parts.
(2)Which is more complex,building a living thing or building a house?
Building a living thing is far more complex than building a house.
(3)Do some twins have the same DNA?
Yes,they do.
(4)Is it possible to change your DNA?
Yes,it is.In the future,scientists might be able to change our DNA.
(5)Whose DNA is related to yours?
People who are related to me.For example,my parents and grandparents.
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DNA-The Story of YouPPT，第三部分內(nèi)容：Main phrases:
·in general
·except for
·be related to
·billions of
Main sentences:
·What can scientists do with DNA?
·But building a living thing is far more complex than building a house.
·Except for some twins,every living thing has its own unique DNA.
·Some health problems can be caused by problems in your DNA.
·In the future,scientists might be able to change your DNA.
·There are copies of your DNA in every part of your body.
·You have your own unique DNA,but it repeats patterns from your parents’ 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!
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DNA-The Story of YouPPT，第四部分內(nèi)容：教材解讀
1.What can scientists do with DNA?
do with為固定短語(yǔ),意為“處理”,強(qiáng)調(diào)對(duì)象,與疑問詞what連用。
【拓展】deal with也意為“對(duì)待,處理”,側(cè)重處理的方式、方法,與疑問詞how連用。
2.In general,a blueprint is a drawing that shows how to put a house together with many different parts.
◆in general意為“一般而言,概括說(shuō)來(lái)”,通常置于句首,也可以用generally speaking來(lái)表示。
◆different為形容詞,意為“不同的”,常用于以下結(jié)構(gòu)中:be different from與……不同;be different in…在……上不同。
3.But building a living thing is far more complex than building a house.
◆living為形容詞,意為“活著的,活的”,常作定語(yǔ)。
◆far為副詞,意為“非常,遠(yuǎn)遠(yuǎn)”,用來(lái)修飾形容詞和副詞的比較級(jí),表示程度。
【拓展】同樣用法的詞還有even“甚至”;rather“相當(dāng)”;much“……得多”;a little/bit“有點(diǎn)”;a lot“……得多”等等。
4.Except for some twins,every living thing has its own unique DNA.
◆except for意為“除……之外,要不是由于”,它要求排除的是不同類的。
【辨析】except for,except,besides,but
(1)except for意為“除了”,表示對(duì)主體的肯定和局部的否定,用于不同類的事物間。
(2)except可用作介詞,意為“除了……之外”,表示同類事物間的排除關(guān)系。
(3)besides可用作介詞,意為“除……之外”,表示同類事物間的疊加關(guān)系。
(4)but可用作介詞,意為“除……之外”,常與no,all,every,each,none,nobody等詞連用,有時(shí)可與except互換。
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DNA-The Story of YouPPT，第五部分內(nèi)容：Practice
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?
Ⅱ.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 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?
A.Their DNA can’t combine.
B.We can make plants that are bad for pests.
C.They can even combine the DNA of a plant and an animal.
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DNA-The Story of YouPPT，第六部分內(nèi)容：Homework
1.Finish off the exercises in the activity book.
2.Preview Lesson 30.
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