11.聽下面一段材料,回答第 17至 20題. 17.Which country does Jack Hall come from? A.America. B.England. C.Canada. 18.What subjects did Jack Hall study hard at school in order to be an astronaut? A.Maths and science. B.Science and physics. C.Physics and maths. 19.Where did he get a job after graduating from university? A.In a space station. B.In a space agency. C.In a research center. 20.How many people working in the space programme can go into space in the end? A.Only a few of them. B.Only half of them. C.Most of them.