(共16张PPT)
Lesson 8
北京版小学英语六年级下册
Unit2 Can you tell me more about her
Warm-up
能读懂短文，理解人的肤色与黑色素多少有关。
了解世界上有不同肤色的人种，能简单说出其形成的原因。
能通过阅读逐步形成根据上下文猜测、提取关键信息的能力。
Teaching Goals
What are their skin colours
What colour is our Chinese people’s skin
Are there any other skin colours in the world Do you know
People of different colours
How many kinds of skin colours
Why are people of different colours
melanin
黑色素
A dark substance in the skin and hair that causes the skin to change colour in the sun's light.
Why Are People of Different Colours
All skin colours come from melanin（黑色素）. Our body makes melanin to protect our skin from the sun. People with more melanin are darker and those with less are lighter.
People in hot areas develped（生长）more melanin because dark skin helped protect against the sun and skin cancer. In colder countries, people developed lighter skin because they did not face the same kind of pressure to protect themselves from the sun. If your parents came from sunny places, you were born with more melanin and darker skin. If your parents came from less sunny places, you were born with less melanin and lighter skin.
Put a bandage around your finger on a sunny day. Take it off a few days later. Did that part of your finger make any melanin No! The bandage blocked the sun from the skin. When sunlight hits your skin, melanin comes to protect it, and gives you a tan.
Can you read
Task1
Tick(√) or cross(×).
( )1. Darker-skinned people have more melanin than lighter-skinned people.
( )2. Dark skin can help protect against the sun and skin cancer.
( )3. If you were born in a hot and sunny place, you would have darker skin.
( )4. Our body can produce melanin without sunlight.
√
√
√
×
Task2
What will your finger look like after you remove the bandage several days later
Task 3
Think and match.
Task 4
Answer the following questions.
1. Why do the Chinese people have darker skin than most people in Northern Europe
It’s colder in Northern Europe. In colder countries, people developed lighter skin because they did not face the same kind of pressure to protect them from the sun.
2. Why do the Chinese people have lighter skin than many people in Africa
It’s very hot in Africa. People in hot areas developed more melanin because darker skin helped protect against the sun and skin cancer.
Why are people of different colours
Thanks for your attention!
