课件31张PPT。Lesson 10 What is DNA?DNA简介http://video.sina.com.cn/v/b/71609745-2722573952.html
教学目标 1. 掌握下面的单词及短语：
Words: generally twin clone not only…but also…
Phrases and sentences: not only…but also…
2. 重点短语 句子
the same as
generally speaking
except for
A blueprint shows where to put all the parts of the house.Warming up What do scientists do with “DNA”？寻人启事New wordsblueprint generally twin egg clone identify not only…but also… Generally speaking, boys are … twinThe clone sheep Dolly
was cloned using a technique called nuclear transfer .What is DNA?
DNA is like a blueprint. It is a pattern .
Your body use this pattern to build
itself. DNA is the “blueprint of life.”DNA from the textThe use of DNA:
1: From your DNA, scientists can identify
not only you, but
also people related to you.
2:Some health problems come from your
family’s DNA.
Scientists can look for these problems
in your DNA.
Sometimes they can help you before you
become sick.Useful structures and expressionsnot only…but also“不但……而且”,连接句子中并列成分。
1. Li can speak not only English but also French.（连接并列宾语）
李不仅会说英语而且会说法语。
I’m not only tired but also thirsty.
我不仅累而且也渴。（连接并列表语）
2. 当它连接并列主语时，谓语动词就近原则。Not only Danny’s parents but also Danny has been to the Great Wall.
不仅丹尼的父母而且丹尼也去过长城。
Not only fish but also vegetables on the table were eaten up by the guests.
不仅鱼肉而且桌子上的蔬菜也被客人吃光了。
同义词组是：both… and…,但这个连接并列主语时谓语动词通常用复数。
Both Li and Wang are good at dancing.
李与王都擅长跳舞。
Both fruits and meat are good for our health.
水果和肉都对我们的健康有好处。
其他：neither…nor…,either…or连接并列主语时谓语动词也是就近原则。
Neither my parents nor I am used to living in the country.
Either you or Li is wanted on the telephone. I’m not sure.疑问词+to do…,why 除外
eg. No one knows how to use the machine.
没有人知道怎样用这台机器。
I haven’t decided when to leave for Beijing.
我还没决定什么时候离开去北京。
Who knows what to do next？
谁知道接下来要做什么呢？A blueprint shows where to put
all the parts of the house.
蓝图说明在哪儿安排这个房子
的所有部分。
except for…(…是总体的一部分）
His article is not bad except for the handwriting.
except… (…不包括在内）
Everyone laughed happily except Li.
(Li didn’t laugh.)
besides…(…包括在内）
Everyone laughed happily besides Li.
(Li also laughed happily.)
except for…,except…,besides…Listening and singingYour body and DNA
Are you tall? Are your eyes black or brown? What size are your feet?
When you were a baby, your body already knew the answers ___1_____.
How? With DNA.
DNA is like a blueprint. What’s a blueprint? ____2_____speaking, a blueprint is a drawing. You use it to build a house. It’s the pattern you use to build the house.
DNA is a pattern, too. Your body __3__this pattern to build itself. DNA is the “blueprint of life.”
DNA is fascinating!
___4__identical twins, each living thing has its own unique DNA.
Your DNA is in every part of your body. Your finger has __5__DNA__6__your hair. Your bones have the same DNA as your skin.
You have your own DNA, but it repeats the patterns from your parents’ DNA.
From your DNA, scientists can identify __7__you, __8__people related to you. Who is related to you? Your mother and father are related to you. So are their sisters, brothers and parents.
Some health problems come from your family’s DNA.
Scientists can look for these problems in your DNA. Sometimes they can help you before you___9____.
The keys:1.to these questions2. Generally 3. uses 4. Except for 5.the same 6.as7. not only 8. but also 9.become sickTalk show1. What will our life be like because of
DNA?1. I _________ (交朋友) with some foreigners three days ago.
2. Li doesn’t know the answer ______(about/of /to/on) this question.
3. He show us _________ (what/who/whose/where) to put these flowers.
4. The computer is very good _________ (without/like/except for) its screen.made friendstowhereexcept for根据汉语提示完成英文句子。 1. I don’t know what I should say at that time.（改为同义句）
I don’t know __________at that time.
Both of us are in good health.(改为否定句）
_________is in good health.
3. We can see many people _________ (play) at the square now.
4. -Li had a good time at the party yesterday afternoon.
- so_________________.(别的客人也是）用所给单词的适当形式填空。what to sayNeither of usplayingwere the other guestsencouraging Homework Rewrite “What is DNA?”
( 60—80 words)Generally speaking…
Except for… …the same…as…
...not only…but also… So are their sisters and brothers.
