设集合U={(x,y)｜x∈R,y∈R},A={(x,y)｜2x-y+m>0},B={(x,y)｜x+y-n≤0}，那么点P(2，3)∈A ∩(C_UB)的充要条件是

A.m>-1且n<5                        B.m<-1且n<5

C.m>-1且n>5                        D.m<-1且n>5

n∈N^*且n≥2时，1+2+2²+…+2^4n-1=5p+q，其中p、q为非负整数，且0≤q<5，则q 的值为

A.0                B.1               C.3                  D.与n有关

设集合U={(x,y)｜x∈R,y∈R},A={(x,y)｜2x-y+m>0},B={(x,y)｜x+y-n≤0}，那么点P(2，3)∈A ∩(C_UB)的充要条件是

    A.m>-1且n<5                                          B.m<-1且n<5

    C.m>-1且n>5                                                                                                                      D.m<-1且n>5

点P在双曲线-=1(b∈N^*)上,F₁、F₂为两焦点,若|PF₁|、|F₁F₂|、|PF₂|成等比数列,且|OP|<5,则b=_____________.