题干
_______and short of breath, Andy and Ruby were the first to reach the top of Mount Tai.
A：the; a
B：Tired
C：Tiring
D：Being tired
答案(点此获取答案解析）
B
中，双曲线中心在原点，焦点在
轴上，一条渐近线方程为
，则它的离心率为