教学过程：
一. Free talk:
How are you?
二．Presentation and practise:
1. T: Let’s go the the park.(展示公园图片情景,出现许多公共标志牌)
T: What’s this? They’re public signs.
Learn : public signs.
T: Let’s look at some public signs on the blackboard.展示九个标志在黑板上。
T: Can you read them?
