Millie is getting on well with her friends but she is a little selfish ______. [ ]

A. in time

B. on time

C. at times

D. at a time

对考核不合格的医师，县级以上人民政府卫生行政部门可以（）。

A.吊销其医师执业证书

B.责令其暂停执业活动三个月至六个月，并接受培训和继续教育

C.降低其执业等级

D.变更其工作岗位