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Gaokao Math Practice Question

5. (5 分) 直线 I 经过椭圆的一个顶点和一个焦点, 若椭圆中心到 I 的距离为其 短轴长的 $\frac{1}{4}$, 则该椭圆的离心率为()

  1. A.$\frac{1}{3}$
  2. B.$\frac{1}{2}$
  3. C.$\frac{2}{3}$
  4. D.$\frac{3}{4}$

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