题干
I hope to visit Hawaii some day. Is it a place _______ the weather is always warm?
A：what
B：when
C：where
D：which
答案(点此获取答案解析）
C
I hope to visit Hawaii some day. Is it a place _______ the weather is always warm?
A：what
B：when
C：where
D：which
上的一点
到椭圆一个焦点的距离为
，则