题目

已知GPS卫星的轨道距地面的高度约为地球半径的2倍，则GPS卫星与近地卫星的运行周期之比约为： A．       B．     C．     D． 答案：B 找出所给句子或对话的正确答语。Amy: Hi, Stephen. I hear you come from America. Stephen: 1.________ It's very big.  Amy: 2.________ Stephen: It has 12 rooms. Amy: Oh, it's bigger than my flat.Stephen: 3.________ Amy: It has a dinning room, a bathroom, two bedrooms and a living room. Stephen: Who do you live with?Amy: 4.________ Which is your favourite place? Stephen: 5.________Amy: I hope I can visit your flat one day. A. I live with my parents. B. How many rooms does your flat have? C. My flat. D. What does it look like? E. Yes, I live in a flat in America. 1._____ 2._____ 3._____ 4._____ 5._____