4BUnit3习题一、单项选择1、 Mr Black is a doctor.He works _ .A.in a hospital B.in a factory C.in a school D.in a hotel.2、-Are you a policeman? -_. A.Yes, you are. B.No, you arent. C.Yes, I am D. I dont know.3、What_ your fathers and mothers jobs? A. am B.is C. are D./4、-_? -Im thirty. A. How are you B.How old are you C How many students do you have? D.Whats the
