问题 单项选择题

许多孕妇都出现了维生素缺乏的症状,但这通常不是由于孕妇的饮食中缺乏维生素,而是由于腹内婴儿的生长使她们比其他人对维生素有更高的需求。
为了评价上述结论的确切程度,以下哪项操作最为重要

A.对某个缺乏维生素的孕妇的日常饮食进行检测,确定其中维生素的含量。

B.对某个不缺乏维生素的孕妇的日常饮食进行检测,确定其中维生素的含量。

C.对孕妇的科学食谱进行研究,以确定有利于孕妇摄入足量维生素的最佳食谱。

D.对日常饮食中维生素足量的一个孕妇和一个非孕妇进行检测,并分别确定她们是否缺乏维生素。

答案

参考答案:D

解析:如果D项操作的结果是:孕妇缺乏维生素而非孕妇不缺乏维生素,则将加强题干的结论;否则,将削弱题干的结论。因此,D项操作对于评价题干的结论具有重要性。如果A项操作的结果是:该缺乏维生素的孕妇的日常饮食中含有足量的维生素,则有利于加强题干的结论,但力度不如D项相应的结果。因为在D项中,进行比较的是孕妇和非孕妇,她们日常饮食中维生素都足量,但前者缺乏维生素而后者不。因此,和A项比较,这个孕妇缺乏维生素的原因更可能与怀孕有关。
其余各项对评价题干的结论都不具重要性。

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单项选择题