题目内容：
椭圆的长轴是短轴的二倍，则椭圆的离心率是
A．1/2 B．
C．
D．
参考答案：
答案解析：
单选题：椭圆的长轴是短轴的二倍，则椭圆的离心率是
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- 题目类型：单选题
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B．
C．
D．
B．
C．
D．
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