1、Lesson 29 DNA-The Story of You乐凯中学奚玉岭I.交流预习Checking Preparation1.Check new words in pairs.Leaders read English words.Learners spell.general repeatgrandsongranddaughterinstructionblueprintcomplextwinpatternidentifyrelated一般的；普遍的重复；复述；背诵孙子；外孙孙女；外孙女指示；说明蓝图复杂的双胞胎之一模式；形式确认；鉴别有关的；相关的2.Show time.Leaders re
2、ad.Learners spell.一般的；普遍的重复；复述；背诵指示；说明孙子；外孙孙女；外孙女generalinstructiongranddaughtergrandsonrepeat3.Lead in.Do they look alike?Why?Yes,they look alike.Because they are mother and daughter,father and son.The childerns DNA comes from their parents.What is DNA?.互助探究Learning in pairs 1 DNA is the blueprint
3、of life.()2 Building a house is far more complex than building a living thing.()1.Listen and write T/F.If its false,correct it.1 DNA is the blueprint of life.()2 Building a house is far more complex than building a living thing.()Building a living thing is far more complex than building a house.1.Li
4、sten and write T/F.If its false,correct it.Read after the tape.Read in pairs.2.Reading3.Language pointsDiscuss and underline language points in pairs.1.In general,a blueprint is a drawing that shows how to put a house together with many different parts.一般而言，蓝图就是一副图纸，它显示一座房子的构造。in general“一般而言；概括说来(通
5、常置于句首)”也可以用generally speaking表示。e.g.一般而言，女生比男生容易哭。In general/Generally speaking,girls cry more easily than boys.2.Except for some twins,every living thing has its own unique DNA.除了同卵双胞胎之外，每个生物都有自己独特的DNA。except for“除之外；要不是由于”，它要求排除的是不同类的。except“除之外”，一般不用于句首。它要求排除的是同类的。besides“除之外（尚有）”,包括besides之后的内容，
6、而且是同类的。We all went to the zoo _ Li Ming.除了李明以外，我们都去了动物园。He also knows Japanese _ English.除了懂英语之外，他也懂日语。The city is good _ the weather.除天气外，这座城市还不错。exceptexcept forbesides3.From your DNA,scientists can identify not only you,but also people who are related to you.从你的DNA中，科学家们不但能够辨认出你，而且能够辨认出和你有血缘关系的人。
7、be related to“与有关，使互相关联”e.g.他与我的家庭有关系。He is related to my family.4.Your DNA has billions of instructions that explain why you are the way you are.你的DNA有数十亿条指令说明你为什么是这样的。billions of“数以亿计的；大量的”。e.g.数以亿计的星星在天空上。Billions of stars are in the sky.III.分层提高Exercise1.Fill in the blanks with the phrases in th
8、e box.in general except for not onlybut alsorelated to even if the sameas1.Your homework is quite good_ a few spelling mistakes.2._ the young _ the old like pop music.3.Kates hair is _colour _ her sisters.4._,women live longer than men.5._many difficulties remain,we can overcome them.6.Is wealth(财富)
9、_happiness?except forNot onlybut alsothe sameasIn generalEven ifrelated toIV.归纳总结SummarySummarize in pairsLearners summarize first;then leaders summarize.What have you learned in this class?I have learnedNew Words:general repeat grandson granddaughter instructionblueprint complex twin pattern identi
10、fy relatedPhrases:in generalexcept for,except,besidesbe related to billions ofSummaryV.巩固提升Improvement1 Complete the passage with sentences in the box.Changing DNA Do you know DNA can be changed?Have you ever seen a pig with a dogs body?Of course not!Pigs and dogs cant have babies together._ But now
11、,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
12、bad for humans,too?A.Their DNA cant combine.B.We can make plants that are bad for pests（害虫）.C.They can even combine the DNA of a plant and an animal.ACB1.Can scientists take DNA from one kind of animal and put it into another kind of animal?2.What can scientists do with“DNA”?3.Can we make plant that
13、 are bad for pests with“DNA”?2.Read the whole passage and answer the questions.Yes,they can.1.Can scientists 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.They can even combine the DNA of a plant and an animal.
14、2.What can scientists do with“DNA”?3.Can we make plants that are bad for pests with“DNA”?Yes,we can.Is it a good idea to change the DNA of the food we eat?Some people say doingthis makes our food better.Others think its too dangerous.Write down your ideas.Is It Good to Change DNA?WritingHomeworkLearners:Review words and expressions.Leaders:Finish the passage.Preview the words and expressions in Lesson 30.
