题干
I'm very proud that Beijing is one of _______ cities in the world.
A：big
B：bigger
C：biggest
D：the biggest
答案(点此获取答案解析）
D
I'm very proud that Beijing is one of _______ cities in the world.
A：big
B：bigger
C：biggest
D：the biggest
的离心率为
，且它的一条准线与抛物线
的准线重合，则此双曲线的方程为（ ）