2. Look at the pictures of rainbows and discuss how many colours there are in a rainbow.

1. Discuss the questions about a rainbow.

Q: Have you ever seen a rainbow?

Q: When does a rainbow appear?

3.　　　 Remind students of different colours.(Give some pictures about colours to help the students.)

Step2, Welcome to the unit

2.　　　 Q: How many colours are there in the Olympic rings?

A: Five.

Q: What are they?

A: blue, black, red, yellow, green.

1. This summer, the 29^th Olympic Games were held in Beijing. Show some pictures about the 29^th Olympic Games/rings. (奥运盛会一下子就会激发学生的兴趣，但是也要防止部分学生兴奋过度，所以相关图片请根据班级情况略做调整.)

4.　　　 Can you give some advice to the government?

2　 Read and understand　

Please choose the proper words to fill in the blanks.

　none　　　　 nobody　 others　　 　anything　　 　　other

　something　 everyone　 everybody　 　everywhere　 　anybody

Dear Headmaster,

　 I’m writing to tell you 　　1　　 　important.　　 2　　 　likes to be untidy, however, some students throw waste paper and bottles 　　3　　 .We all need a quiet place to study, but some students often make too much noise at school. Even worse, some of them are quite rude when talking to 　　4　　 　.

　　　 5　　 knows their behavior is bad, but 　　6　　　 　of us knows how to stop them.

　I think we should make rules to change the situation. Perhaps it will be hard for us to keep the rules in the beginning, but if 　　　7　　 does their best to follow the rules, our school will become better and better day by day.

　　　　　　　　　　　　　　　　　　　　　　　 Sincerely,

　　　　　　　　　　　　　　　　　　　　　　　 Kangkang

3　　　 　Work alone

　 Listen to the tape and number the following sentences in the correct order.

(　　 )　 a. In the past, people killed animals for their meat and skin.

(　　 )　 b. We should do our best to protect animals.

(　　 )　 c. Some people destroy the environment where animals live.

(　　 )　 d. Some animals are even in danger of disappearing completely.

(　 )　 e.Humans have come to realize the importance of protecting animals.

3.　　　 What should students do and not do to protect the environment?

2.　　　 Why is air pollution a serious problem in China?

1.　　　 What are they talking about?

2. Homework:

Write an article about the changes because of pollution.