A:{-1,0,1}
B:{0,1}
C:{-1,0}
D:{1}
地球上产生昼夜交替现象的根本原因是( )
今天,三峡正以她崭新的容颜吸引着世人,下面请你为新三峡大坝写一段导游词。
A:Can I go outside?
B:
I don't like______ people and______ traffic in the big city.