2009 National Question 2 Single-choice Differentiating 2009_退役省自主命题 (2009·文) 2.(5分)(2009•湖南)抛物线 $y^{2}=4 x$ 的焦点坐标是 A. $(4,0)$B. $(2,0)$C. $(1,0)$D. $\left(\frac{1}{2}, 0\right)$ Answer keyC ☆ SaveCan't do it, show the explanation查看原卷 →