Unit2 Can you tell me more about her ？Lesson 8（课件）北京版英语六年级下册

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? 销售 额 white yellow black brown 0.54 0.37 0.085 0.005 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 N