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【Task 1: Group work】What do you know about DNA?（答案不唯一，用的词越多越好）
DNA is _____________________________________________________________________
DNA can ____________________________________________________________________
My DNA ____________________________________________________________________
设计意图：与学生进行一个简短的对话，激发学生对科学的兴趣，并且进入本课主题。
【Task 2 : Listen and Fill】Listen to the passage and fill in the blanks.
1. DNA is the ______________ of life.
2. The DNA in living things can be _________to make them fit the world they live in.
3. Your finger has the __________ DNA as your hair.
4. Your parents and grandparents are related to you, and you have _________ DNA.
5. DNA is one of the most ______________things on the earth.
设计意图：通过听短文填空训练，使学生初步了解文章内容。
【Task 3: Reading practice】
任务型阅读：1题完成句子； 2~4题简略回答问题； 5题将句子译成汉语。
1. It takes millions of years for nature to change the DNA in living things to _______________
__________________________________________________________________________.
2. What can our health problems be caused by?
___________________________________________________________________________.
3. Does every living thing have its own unique DNA?
_________________________________________________________________________
4. Where does your own unique DNA come from?
_________________________________________________________________________.
5. From your DNA, scientists can identify not only you, but also people who are related to you.
___________________________________________________________________________
设计意图：通过任务型阅读训练，训练学生对文章细节理解的能力。
【Task 4：Language Points】
试着翻译下列定语从句，并体会定语从句：
A blueprint is a drawing that shows how to put a house together with many different parts.
Your DNA has billions of instructions that explain why you are the way you are.
设计意图：通过翻译训练，使学生初步了解定语从句。