Our government has tried many ways to the smog(雾霾)problem. Maybe we'll have a clear sky in the near future.
A:put away
B:work out
C:come up
汽车上有许多地方要利用光的反射,A为观后镜,B为车头灯内的反射镜.A应为____,B应为____.(填“平面镜”“凹面镜”或“凸面镜”)
下列选项中,不能成为感觉器官的是( )