Gaokao Math Practice Question
5.（5 分）若 $a>1$, 则双曲线 $\frac{x^{2}}{a^{2}}-y^{2}=1$ 的离心率的取值范围是（ ）
- A.$(\sqrt{2},+\infty)$
- B.$(\sqrt{2}, 2)$
- C.$(1, \sqrt{2})$
- D.$(1,2)$
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