Obiectives 1. understand the main idea( early civil rights struggles in the US, esp the Underground Railroad) 2. learn to use library resources and other resources for information 3. grasp the key language points and grammatical structures in the textObjectives • 1. understand the main idea ( early civil￾rights struggles in the US, esp. the Underground Railroad ). • 2. learn to use library resources and other resources for information. • 3. grasp the key language points and grammatical structures in the text