A terrorist attack        at Kunming Railway Station ,and 29 people        in the event .

A．was happened , may be killed

B．happened , killed

C．happened , were killed

D．happened , are killed

患儿，男，10岁，因患上呼吸道感染，曾服用氯霉素3天。检查结果：贫血，网织红细胞<0.1%，骨髓有核细胞增生减低，见到巨大原始红细胞，后经用青霉素治疗后，骨髓象即恢复正常，可能诊断为（）

A.再生障碍性贫血

B.感染性贫血

C.急性造血功能停滞

D.溶血性贫血

E.缺铁性贫血