The father and the son entered the tiger area _______ two doors were open at the time.

Suddenly five tigers appeared, one of which killed the father.

A．there

B．which

C．its

D．whose

某妇女，婚后2年，因漏服避孕药后停经50天，妊娠试验阳性， * * 出血3天，略少于月经量，下列处理哪项最佳

A．给黄体酮肌内注射保胎

B．卧床休息，给镇静药治疗

C．行刮宫术

D．复查妊娠试验

E．做B超检查