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Step 1 Greeting
Step 2 Lead in
Ask students the following questions : “Do you know DNA ? How much do you know about DNA? What can we do by DNA?”
1When the lost children are found, we can tell who are their parents.
2 DNA can help the police catch the bad man.
3 People are often ill. We can prevent some illness by DNA. We can live longer.
4 The scientists can study the people long long ago.
Do you know why we can do these things? Let’s find out the answer in Lesson 29.
Step 3 Learn the new words in groups and then ask some students to read the new words. And then give the students one minute to ask the students to remember the all the new students. Then do some exercises.
1 She had a confused idea of life in__general______(一般的).
2 Could you_____repeat_____(重复) that question for me?
3 Please follow his__pattern_____(模式) to do it.
4 Our culture is ___more complex______(复杂的) than he knows.
5 Would you be able to_identify_______(辨别) the man who robbed you ?
6 please look at the _instruction_____(说明)before you take the medicine.
Step 4 Listen to the tape and write T or F（初步感知课文）
( T ) 1 A blueprint shows where to put all the parts of the house.
( T ) 2 You can know what size your feet are with DNA.
( F ) 3 Every living thing has the same DNA.
( F ) 4 Your DNA is different in every part of your body.
( F ) 5 Your DNA is different from your parents’.
Step 5 Let’s Do It ! No.1 Read the lesson and answer the questions.（了解课文大概内容）
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 or building a house?
Building a living is more complex.
3 Do some twins have the same DNA? Yes.
4 Is it possible to change your DNA? Yes .
5 Whose DNA is related to yours? People who are related to you.
Step 6 讲解课文中的重点知识点。in general, except for, be related to, not only…but also