A.1<X<5 B.X=2 or X=3 or X=4 C.1<X And X<5 D.Not (X<=1) And Not (X>=5)
A.a<=1或a>=5 B.a<=1,a>=5 C.a<=1 or a>=5 D.a<=1 And a>=5
A.2^a+5 B.2^a+2^5 C.2^(a+5) D.2^a2^5