Objectives（单元目标）：

After learning the unit, you will be able to:

1 master the usages of some key words and phrases about environmental issues (K);

2 know how to use the relatives properly in attributive clauses (K);

3 talk about the activities on Earth Day (S);

4 describe what can be done to protect the environment (S);

5 build the awareness of environmental protection (Q).

Note: 

K-knowledge （知识目标）  

S-skill （技能目标）  

Q-qualify （素质目标）