Theory is （） in the practice of language teaching. It reveals itself in the assumptions underlying practice, in the planning of a course of study, in the routines of the classroom, in the value judgments about language teaching, and in the decisions that the language teacher has to make day by day.

营养性缺铁性贫血的铁剂治疗中，错误的是（）

A.铁剂宜空腹服用

B.口服铁剂宜选用三价铁盐

C.口服铁剂宜与维生素C同时口服

D.优先使用注射铁剂

E.铁剂用到血红蛋白正常后6～8周左右再停药