慢性再生障碍性贫血治疗应首选铁剂.
参考答案：错
解析：
慢性再生障碍性贫血治疗应首选雄激素药物。
He ______________ two tickets for us before he arrived at the entrance of the cinema.
A．had reserved
B．has reserved
C．was reserving
D．has been reserving
"髓海"指的是（）
A.骨
B.胆
C.髓
D.脑
E.女子胞
