—Could I finish it today or tomorrow ?

—Either day is OK．Take your time．You _________ do it as you like．

A．can

B．must

C．need

D．might

有关铁剂治疗缺铁性贫血的叙述，下列哪项不正确

A．症状纠正后继续服药3～6个月

B．网织红细胞数增加是治疗有效的指标

C．于饭后服用

D．服药后可出现黑粪

E．可防止缺铁性贫血的复发