下列哪些情况一般属于低色素性贫血()
A.球形红细胞增多症
B.缺铁性贫血
C.恶性贫血
D.重型地中海贫血
E.铁幼粒细胞贫血
参考答案:B, D, E
He seems _________the homework, for he was taking a walk on the playground. [ ]
A. has finished
B. to have finished
C. to finish
D. finished
17,29, 19,9, ( )
A.8
B.7
C.6
D.5