问题
选择题
We want two good musicians _________ our rock band. [ ]
A. for
B. in
C. of
D. at
答案
答案：A
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We want two good musicians _________ our rock band. [ ]
A. for
B. in
C. of
D. at
答案：A
的右焦点，直线y=
与椭圆交于B，C两点，且
，则该椭圆的离心率是（）.