约2400字。
　　Unit 3《What were you doing when the UFO arrived?》教案
　　【单元目标】
　　1．单词与短语
　　well, buy, cut, land, while, experience, strange, around, follow, b, shout, run, anywhere, happen, accident, modern, bright, silence, destroy, meaning, souvenir
　　get out (of)　　　　
　　in front of / in the front of　　　　
　　take off　　　
　　buy for
　　land on　　　　　
　　shout to / at　　
　　run away　　　
　　e in　　　　　
　　hear about
　　the Museum of Flight
　　happen to　　　　　　
　　stop doing　　　　　　
　　take place　　　　　
　　as... as　　
　　2．目标句型：
　　1. What were you doing when...?
　　2. I was doing sth. when...　
　　3. How about... / What about...?
　　4. What happened next?
　　5. While sth./sb. was doing sth., I did...