—Are you ready to leave, Helen? —_________—I was just asking if you're ready to leave.
A:Don't be shy.
B:I beg your pardon?
C:I'm afraid not.
D:I hope so.
已知点P是以F1、F2为焦点的椭圆x2a2+y2b2=1a>b>0上一点,且PF1→·PF2→=0,tan∠PF1F2=12则该椭圆的离心率为( )
读句子,在括号里写出各句的修辞方法。
①阳光下盛开的百合花就是您的笑容。____
②顽皮的雨滴最爱在雨伞上尽情的跳舞。____
鸦片战争后签定了中英《南京条约》,在该条约的各项条款中,最能体现英国发动战争的本质意图的是( )