— How was your stay in Hong Kong?
—________. And it was a pity that I couldn't stay there longer.
A:Nothing could be worse.
B:It was just fantastic.
C:A terrible experience.
D:What a hard time I had!
写出图中数码所代表地理事物名称:
在平面直角坐标系xOy中,已知椭圆 x2a2+y2b2 =l (a>b>0)的焦距为2,离心率为 22 ,椭圆的右顶点为A.