一、明确目标，自主学习
1. 教学目标：
（1）To master this basic words and expressions in this lesson and use them freely.
（2）To develop your reading comprehension’s abilities by active discussion and cooperation.
（3）To guide Ss to form a right attitude to words usages
2. 预习内容：可以按知识体系设置，最好分层设置
