--- Everybody is playing outside. Can I join them, Mom?

--- _______ Not until you have finished practicing the piano.

A．Why not?

B．Will you?

C．I hope so

D．I’m afraid not.

孕妇，32岁，孕1产0。现妊娠33周，近10d自觉头晕、乏力、心悸及食欲减退。查体：面色苍白，HR100次/分，胎位、胎心及骨盆测量均正常，血红蛋白80g/L，血细胞比容0.25

首选的药物为（）。

A.口服叶酸

B.少量多次输血

C.肌内注射右旋糖苷铁

D.口服硫酸亚铁

E.肌内注射维生素B₁₂