A:coming, asking
B:coming, being asked
C:to come, asking
D:to come, being asked
南极地区,是人类最后到达的大陆,被称为“第七大陆”,关于南极你了解多少呢?完成下题.
设F1、F2是椭圆E:x2a2+y2b2=1(a>b>0)的左、右焦点,P为直线x=32a上一点,△F2PF1是底角为30°的等腰三角形,则E的离心率为( )