Unit 3 What were you doing when the UFO arrived?Period One (Section A 1a-2c)学习目标：New words:UFO,barber,bathroom, alien,kitchen,bought, land, got, whileKey phrases: get out, take offKey sentences: .What were you doing when the UFO arrived?I was cooking dinner in the kitchen.What was he doing when the UFO arrived?He was sleeping late when it arrived.The girl was shopping when the alien got out.While the girl was shopping, the alien got out.学习重难点：重点
