2018年秋冀教版九年级全册英语教案：Unit 5 Lesson 29
Unit 5 Look into Science
Lesson 29 DNA-The Story of You
1. Analysis of the Students
The students of Grade 9 have mastered certain vocabularies，expressions and structures. They also have the abilities of self-teaching and working in groups. Most of them are willing to express their opinions in English
2. Analysis of Teaching Content
Lesson 28 is the fifth lesson in Unit 5, Book 5.This unit focus on the subject Look into science, also teach the students something about science. Students cares about the subject because it is close to everyone. Lesson 28 mainly talks about DNA, it tell us the character and function of DNA, also understand our body. We are unique in the world.
To master the words: blueprint, general, complex, twins, pattern, identify, be related to, except for.
2. To master the phrases: not only…but also, except for, be related to, billions of.
Improve the students’ ability of speaking, listening, reading and writing. Understand the articles about DNA.
Know more about the nature, know more about our body. You are unique in the world.
To master the compound sentences.
To master the use of DNA.
Tape recorder, Multimedia
Step 1. Warm-up
Free talk: (show the picture of DNA, tell students DNA is short for deoxyribonucleic acid.)
Think about it!
1. What do you know about DNA?
2. What can scientists do with DNA?
Step 2. Presentation
Where is it in our body? (Show some pictures of DNA.)
What's the function of DNA? (Show some pictures of twins.)
2. Explain the new words.
3. 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?
(3) Do some twins have the same DNA?
(4) Is it possible to change your DNA?
(5) Whose DNA is related to yours?
4. Check the answers and underline the key words.
5. Listen and follow to the tape.
6. Explain the language points:
Jack sits between Tim and Bob.
She was among the crowd.
use…to do sth. 用……做某事
She is using a knife to cut vegetables.
Is the fridge very useful?
He has a baby brother, too.
He doesn’t have an eraser, either.
He makes all his own notebooks.
Who owns the car? 这辆汽车是谁的？
owner n. 所有人；物主
She is the owner of the house.
David is a good man except for hot temper.
The classroom is nice except for dirty on the floor.
Step 3. Practice
Read the lesson by themselves.
Fill in the blanks with the phrases in the box on page 75.
in general, except for, not only…but also,
related to, even if, the same…as…
(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?
Check the answers.
Ask students: Do you think DNA can change each other? Read again and Complete the passage with the sentences in the box.
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. 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?
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.
5. Check the answers.
Step 4. Consolidation
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.
1. Discuss the idea of yours.
2. Write down your ideas.
3. Report you ideas.
1. Listen and read.
2. Finish exercises of this lesson.