冀教版九年级下册英语第10课课件.ppt

Lesson 10: Lesson 10: What is DNAWhat is DNA？Warming uplDo you and the students near you look the same? What is the same? twinsAre there any differences between you and your friends?Zhang Liangying looks like her motherdiscussion Do you look like your father or mother? Do you know why?Do you know DNA?Are your fingerprints the same as your mothers?New wordslblueprint n. 蓝图l except for 除了lidentical adj. 完全相同的ltwin n. 双胞胎lidentify v. 鉴别；确认lnot onlybut also 不但 而且Listening Task:vGenerally speaking, a _ is a drawing.v_ for identical twins, each living thing has its own unique DNA.blueprintExceptReading Task:vWhere does your DNA come from?vYour parents. vIs your DNA in every part of your body? vYes, it is.You DNA comes from your parentsIdentical twins are two children that grew from the same egg. They have identical DNA. Theyre clones!Language notes Are there differences between you and them? 你和他们之间有什么不同吗? 【辨析】：between与among between常用于两者之间，among一般指三者或三者以上，如果指三个以上的人或物的每两个之间时，仍然要用between。

Switzerland lies between France, Italy, Australia and Germany. 瑞士位于法国，意大利，奥地利及德国之间 They live among the mountains. 他们住在群山之中 I was among the crowd. 我处在人群中lYou use it to build a house.你用它来建造房子luse的用法luseto do sth. 用做某事lHe is using a knife to cut bread. =He is using a knife for cutting bread. 他正用小刀切面包lUse your eyes to look and dont use your hands to touch. 用眼睛看而不用手摸lIt is no use doing (to do). 做是无用的（无益的）lIt is no use crying over spilt milk. 不要为打翻的牛奶哭泣覆水难收）l【注意】luse的名词和动词同形，但要注意两者的读音/ju:z/是动词的读音，而/ju:s/是名词的读音。

useful是形容词，它是由名词use加后缀-ful构成的如：lWhats the use of this? 这个有什么用途？lIs the fridge very useful? 这台冰箱很有用吗？ DNA is a pattern, too. DNA也是一种模型 too也 too表示“也”时通常置于句末，其前用逗号，其后用句号如： I have seen the film, too. 我也看过那部电影 【辨析】：too与either too与either都表示“也”，其区别是too用于肯定句，表示“也”；either用于否定句，表示“也不”他们通常都位于句末，其前用逗号隔开如： He has a sister, too. 他也有个小妹妹 He doesnt have a knife, either. 他也没有小刀nExcept for identical twins, each living thing has its own unique DAN. 除了每个双胞胎之外，每个生物都有他唯一的DNAn1)except for除以外，只是nHe is a good ma except for hot temper. 除了脾气暴躁外，他是个好人。

nYour article is quite good except for several spelling mistakes. 你的文章很好，只是有几处拼写错误n2)【辨析】：every与each every与each都可与单数名词连用，且意义相近，表示“每个”，然而every与each并不完全一样，every强调整体概念，each则表示个体概念如： Each day is better than the one before. 一天比一天好 Every player was in good conditions. 每个运动员都处于很好的状态 如果不特别强调某一意义时，every和each可以互换如： We want every child to succeed. 我们希望每个孩子都成功 Each child will find his own road to success. 每个孩子都会找到他个人的成功之路leach可以指两个或两个以上的人或东西，every却不能指两个，只能指三个以上的数量如：lEach sex has its own physical psychological characteristics. 男女各有其身体上和心理上的特点。

不能说every sex）l另外，如有其它限定词同时修饰中心词，each可作代词用each of的形式，而every则只能用限定词如：lEach of my parents gave me presents for Christmas. 过圣诞节是我父母每人都给了我礼物v3)own的用法vadj. 自己的（用在所有格后面，加强语气）vNow ask the same question about your own teachers. 现在请向你自己的老师问同样的问题vShe makes all her own clothes. 他所有的衣服都是自己做的vvt. 有；拥有vWho owns the bike? 这辆自行车是谁的？v【友情提示】：vowner n. 所有人；物主vHe is the owner of the house. 它是这座房子的主人vThe owner of the shop came to see what was the matter. 店主人走过来看看发生了什么事情 From your DNA, scientists can identify not only you but also people related to you. 在你的DNA中，科学家们不但能鉴别你，而且也能鉴别和你有关系的人。

1)not only but also不但而且，连接两个相同的成分，也可连接两个分句not only but also连接两个并列主语时，谓语动词和后面助于保持一致；not only but also连列两个并列分句，not only置于句首，通常用倒装结构，也就是说，把not only引导的分句中的助动词或be提到主语前面He likes not only English but also math. 他不仅喜欢英语，而且喜欢数学Not only you but also I am a teacher. 不仅你而且我也是一名老师Not only does he work hard, but also he is very clever. 他不仅工作认真，而且很聪明2)relate to涉及，有关The story related to the Second World War. 故事讲的是第二次世界大战的事情I have a book relating to the Autumn Harvest Uprising. 我有一本关于秋收起义的书。