题干
—I'd like a wake-up call at 7:00 a.m., please!
—OK, _______.
A：help yourself
B：You will certainly make it
C：just do what you like
D：I'll make sure you get one
答案(点此获取答案解析）
D
的焦点
为双曲线
的一个焦点，经过两曲线交点的直线恰好过点