A:正东
B:正西
C:西北
D:与原出发点重合
如图所示,当开关S1、S2断开时,电路是____,当S1闭合、S2断开时,电路是____;当S1、S2都闭合时,电路是____.(选填“通路”、“开路”或“短路”)
社区是我们生活的地方,也是我们学习成长的地方,它为我们提供了精神粮食。( )
人体形成尿液的器官是( )
The little pupil took his grandma ____ the arm and walked her across the street.