A Nice Clean Plate
   It's Saturday evening. Bruce is having a birthday party. There are a lot of children at the party. They play together for an hour. Then Bruce's mother gives them some food. But she forgets to give Sam any.
   Sam feels wronged(委屈) but then he remembers his mother's words, “Be polite.(礼貌). Don't ask for food.” So he waits for a few minutes, then he holds his plate up over his head and says loudly, “ Does anyone want a nice clean plate?”

若复数$z=\frac{1+i}{1-i}+m\left(1-i\right)$(i为虚数单位)为非纯虚数，则实数m不可能为(   )

下列说法正确的是（  ）

读亚洲各海拔所占比重图，完成小题。