遗传性球形红细胞增多症（）
A.慢性失血
B.造血干细胞缺陷
C.红细胞酶异常
D.红细胞膜缺陷
E.血红蛋白合成异常
参考答案：D
.Yang Liwei as well as the other two astronauts _______ to be the most qualified for space exploration.
A．considered
B．had considered
C．was considered
D．were considered
含铁血黄素是在下列哪种细胞内形成的（）。
A.多核巨细胞
B.单核巨噬细胞
C.嗜酸粒细胞
D.中性粒细胞
E.红细胞
