(单选题)

The key topic discussed in this passage is ______.

A.whether the prices of these supplements are reasonable

B.whether supplements are suitable for people of all ages

C.whether we should take supplement to balance our diet

D.whether the industry of supplements is profitable

参考答案：C

参考解析：

主旨大意题。根据文章第一段最后一句“But given our nutrient-deprived diets, should we really stop taking these pills altogether?”以及整个文章内容可知，本文是在探讨是否需要补充营养以平衡饮食，C项符合。A项“这些补品的价格是否合理”；B项“补品是否适合所有年龄段的人”；D项“补品行业是否有利可图”均不符合文章主旨。故选C。

知识点：阅读理解四选一英语专业基础知识阅读理解教师招聘-小学英语