题干
—The children will be _______ if they stay at the hotel for a whole day.
—It is very _______ for kids to stay in a small room for too long.
A：bored; boring
B：bored; bored
C：boring; boring
D：boring; bored
答案(点此获取答案解析）
A
(
)的左焦点
作
轴的垂线交椭圆于点
，
为右焦点，若
，则椭圆的离心率为（ ）