单选题 Activist parents say school kids aren't ______ enough to understand that a fruit-flavored soft drink doesn't have the nutritional benefits of real fruit.
A. adulterated B. mingled C. sophisticated D. refined

【正确答案】 C

【答案解析】[解析] adulterated“掺入次级品的”；mingle“(使)混合”；sophisticated“富有经验的，老练的，练达的”；refine“精炼，精制”。