There is a picture __________ the wall. And there are two windows __________ the wall.
A:in; in
B:on; on
C:on; in
D:in; on
too, is, expensive, it ( . )
____
已知圆C1:(x-2)2+(y-3)2=1,圆C2:(x-3)2+(y-4)2=9,M,N分别是圆C1C2上的动点,P为x轴上的动点,则PM+PN的最小值为( )
读“五带划分示意图”,回答下题.