冀教版九年级全册 Look into Science Lesson 29课件 (共27张PPT)

Structures and Expressions
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
Let’s do it!
1. Read the lesson and answer the questions.
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.
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
一般来讲，纯色的地毯使房间显得更大。
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.
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.
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.
3. Do some twins have the same DNA?
Yes, they do.
4. Is it possible to change your DNA?
Yes. In the future, scientists might be able to change our DNA.
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.
1. Your homework is quite good ___e_x_ce_p_t__fo_r__ a few spelling mistakes. 2. _N__o_t _o_n_ly_ the young _b__u_t _a_ls_o_ the old like pop music. 3. Kate’s hair is __t_h_e_s_a_m__e_ colour ___a_s__ her sister’s. 4. __I_n_g_e_n_e_r_a_l_, women live longer than men. 5. _E__v_e_n_i_f_ many difficulties remain, we can overcome them. 6. Is wealth __r_e_la_t_e_d__to__ happiness?
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
5. Whose DNA is related to yours?
My parents’ and my grandparents’.
2. 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
除了电视的声音，那房间里寂静无声。
辨析except，except for，besides与but
except
except for besides but
表示从整体中除去，不包括所除事物在内
表示说明整个基本情况后，对细节加以纠正 包括所“除”的事物在内
多用在no，nobody，who，where，all等词之后
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.
➢ 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 y
the way you are.
2 能用英语流利地讲述与DNA相关的生物知识。
Free Talk
What do you know about DNA?
What can scientists do with DNA?
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.
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. ___A___ But now, scientists can do it.
·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.
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. ____C____ Some scientists are worried. They say we need to know more about DNA before we start changing it. ___B_____ But what if the plants are bad for humans, too?
Unit 5 Look into Science
Lesson 29: DNA－The Story of You
1 单词: DNA, blueprint, general, complex, twin, repeat, pattern,
identify, related, grandson, granddaughter, instruction
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.
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。
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.
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.