一、Pre-reading
1. Greeting
2. Leading-in
教师活动：Let students discuss following questions:
1. What kind of parks have you been to? What were they they like?
2. When you think of national parks, what comes to mind first?
And show some pictures of famous parks.
活动目的：教师通过提问的方式，引导学生从身边的或熟知的公园谈起，激活有关公园的背景知识，如公园的修建目的和提供的活动，以及公园的种类。
