依次填入下列各句横线处的成语,最恰当的一组是( )①医疗质量是关系到病人生命安危的大事,救死扶伤是医务人员 _________ 的天职。②中国传统的严父慈母型的家庭关系,常令父亲们 _________地承担起教育子女的义务。③在全国比赛中屡获金奖的我省杂技团,_________ 地承担了这次出国演出任务。
A:当仁不让 责无旁贷 义不容辞
B:责无旁贷 义不容辞 当仁不让
C:义不容辞 责无旁贷 当仁不让
D:义不容辞 当仁不让 责无旁贷
Mary: How do you go to Dalian?
Peter: ____
Mary: How do you go to Canada?
Lisa: ____
Mary: How do you go to the park?
Carl: ____
Mary: How do you go to Qingdao?
Tom: ____
Mary: How do you go to the library?
Amy: ____
A. I go to Qingdao by ship.
B. I go to the library by bus.
C. I go to the park on foot.
D. I go to Canada by plane.
E. I go to Dalian by train.
椭圆x212+y23=1的焦点为F1和F2 ,点P在椭圆上,如果线段PF1的中点在y轴上,那么︱PF1︱是︱PF2︱的( )