Gaokao Math Practice Question
4. (5 分) 椭圆 $\frac{x^{2}}{16}+\frac{y^{2}}{8}=1$ 的离心率为（）
- A.$\frac{1}{3}$
- B.$\frac{1}{2}$
- C.$\frac{\sqrt{3}}{3}$
- D.$\frac{\sqrt{2}}{2}$
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