Unit 5 lesson 29课件 2024-2025学年冀教版英语九年级全册

Lesson 29: DNA－The Story of You Unit 5 Look into Science 单词: DNA, blueprint, general, complex, twin, repeat, pattern, identify, related, grandson, granddaughter, instruction 短语: in general, except for, be related to, billions of 句子: （1）In general, a blueprint is a drawing that shows how to put a house together with many different parts. （2）Your DNA has billions of instructions that explain why you are the way you are. Learning Goals 1 能用英语流利地讲述与DNA相关的生物知识。 2 2 Free Talk What do you know about DNA? What can scientists do with DNA? 3 Presentation 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. This is the shape of DNA. Do you think it’s magic? 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! Your DNA comes from your parents. Vocabulary DNA 脱氧核糖核酸 blueprint n. 蓝图 general adj. 总的；普遍的 complex adj. 复杂的 twin n. 双胞胎之一 repeat v. 重复；复述；背诵 pattern n. 模式；形式 Vocabulary identify v. 确认；鉴定 related adj. 有关的；相关的 grandson n. 孙子；外孙 granddaughter n. 孙女；外孙女 instruction n. 指示；说明 in general 一般而言；通常 except for 除……之外 be related to 与……相关 billions of 数十亿计的；大量 Structures and Expressions Let’s do it! 1. 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? A blueprint is a drawing that shows how to put a house together with many different parts. Building a living thing. 3. Do some twins have the same DNA? 4. Is it possible to change your DNA? 5. Whose DNA is related to yours? Yes, they do. 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. 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? in general　except for　not only…but also related to 　even if　the same…as except for Not only but also the same In general　 Even if related to as 3. Complete the passage with the sentences in the box. 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. 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. A 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? B C 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. Language points 1. What can scientists do with DNA? 科学家可以用DNA做什么？ ◉ do with意为“处理”，常与what连用；其同义短语为deal with， 常与how连用。 ※ What did you do with that notebook? 你把那本笔记本放哪儿去了？ 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 2. In general, a blueprint is a drawing that shows how to put a house together with many different parts. 一般来说，蓝图是一 张图纸，展示了如何将房子与许多不同的部分组合在一起。 ◉ in general意为“通常；大体上”。 ※ In general, a plain carpet makes a room look bigger. 一般来讲，纯色的地毯使房间显得更大。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 3. Except for some twins, every living thing has its own unique DNA. 除了一些双胞胎，每个生物都有自己独特的DNA。 ◉ except for意为“除了”。 ※ The room was silent except for the TV. 除了电视的声音，那房间里寂静无声。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 辨析except，except for，besides与but except 表示从整体中除去，不包括所除事物在内 except for 表示说明整个基本情况后，对细节加以纠正 besides 包括所“除”的事物在内 but 多用在no，nobody，who，where，all等词之后 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 4. From your DNA, scientists can identify not only you, but also people who are related to you. 从你的DNA中，科学家不仅可 以识别你，还可以识别与你有血缘关系的人。 ◉ not only…but also…意为“不仅……而且……”。 ※ She spoke not only her native language, Swedish, but also English and French. 她不仅讲她的母语瑞典语，还讲英语和法语。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 5. It’s one of the most amazing things on the earth! 这是地球上最神奇的事情之一！ ◉ 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。 ※ He’s one of my dearest friends. 他是我最亲密的一位朋友。 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 Practice 一、根据句意及首字母提示完成单词。 1. Lucy and Lily are w______. They look the same. 2. In g________, women do it more easily than men. 3. It’s important for you to r________ the text. 4. Mike has a granddaughter and a g________. 5. Before you take this medicine, you must read the i_____________. eneral ins epeat randson nstructions 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 二、单项选择。 1. What did the police ________ that accident? A. deal in B. deal with C. do with D. do about 2. My article is good ________ some spelling mistakes. A. except B. except for C. beside D. besides 3. From your DNA, scientists can identify you and the people ________to you. A. related B. relates C. relating D. Relate √ √ √ 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 Sum up 1. Vocabulary: DNA, blueprint, general, complex, twin, repeat, pattern, identify, related, grandson, granddaughter, instruction 2. Structures and expressions: in general, except for, be related to, billions of 3. Important sentences: （1）In general, a blueprint is a drawing that shows how to put a house together with many different parts. （2）Your DNA has billions of instructions that explain why you are the way you are. Homework 1. Remember the new words and expressions learnt in this lesson. 2. Prepare Lesson 30. $$