4.已知双曲线 dfrac ({x)^2}({a)^2}-dfrac ({y)^2}({b)^2}=1 的一个焦点与抛物线 ^2=4x 的焦点重合,且双曲线的离心率等-|||-于 √5, 则该双曲线的方程为 ()-|||-A. (x)^2-dfrac (4)(5)(y)^2=1 B. dfrac ({x)^2}(5)-dfrac ({y)^2}(4)=1 C. dfrac ({y)^2}(5)-dfrac ({x)^2}(4)=1 D. (x)^2-dfrac (5)(4)(y)^2=1