Unit3 Could you please tell me where the restrooms are?SectionB (3a--Self-check)I. 单项选择：（BC 层学生必做，A 层选做或不做）( )1.---Lily, can you teach me how ________ a train ticket online? I want to go home this Sunday. ---Of course. It’s a piece of cake.A. buyB. to buyC. sellD. to...
