《学习目标》 1. try to learn the new words and expressions of this unit 2. understand the basic collocation of the important words.. 3. grasp the main idea of this passage 《学习重点与难点》 1. learn to make sentences with the new words 2. tell the difference between the words with similar meaning. 《使用说明与学法指导》 1.带着预习案中的单词派生，查阅字典找出相对应的单词形式。
