Unit 1Part onepreparation1.step oneparentchild employeremployee clerkcustomerhusbandwife writereader driverpassengerteacherstudent hostguest buyersellerdoctorpatient boyfriendgirlfriend performeraudiencestep twoco-workers，colleagues，classmates，roommates，schoolmates，seatmates，playmates，lovers，supervisor，neighbors，co-author.Part twopost-readingReading Comprehension1. (1) A B A A B (6)CAC2. 1）killed 2）wounded 3）arrived 4）
