三、学习过程：
Step1. 自主学习
1、Revise the passages in Module6 and think over the following questions:
(1). As we know, more than 12,000 animal species are now in danger. Can you give some examples?
(2). Why are some animals in danger of extinction?
(3). What should we do to save the endangered animals?
2、Revise grammar: the attributive clause
概念整理：(如何选择关系词？)
(1).当定语从句修饰人时，我们使用关系词：____________________
(2).当定语从句修饰物时，我们使用关系词：____________________
(3).当定语从句说明时间，并且关系词做定语从句中的状语时，我们使用关系词：_______________________
