单项选择题
单项选择题 【C1】（）
单项选择题 听力原文：W: Good evening. I'm Roseanne, your flight attendant. Welcome aboard.M: Hello, I've got seat A 6. I hope it's by a window so that I can see the view.Where did this conversation probably take place?A．On a train.B．On a boat.C．On a plane.D．On a bus.
单项选择题 Computers in the United States（） .