题干
We should eat ____ food and it is good for our ____.
A：healthy; health
B：health; health
C：healthy; healthy
答案(点此获取答案解析）
A
We should eat ____ food and it is good for our ____.
A：healthy; health
B：health; health
C：healthy; healthy
的左焦点F的直线
与双曲线的左支交于A、B两点，且以线段AB为直径的圆被双曲线C的左准线截得的劣弧的弧度数为
，那么双曲线的离心率为
