问题
单项选择题
In this passage RDAs refers to ______.
A．types of vitamins
B．types of protein
C．types of minerals
D．amounts of energy, protein, vitamins, and minerals
答案
参考答案：D
解析：[分析] 细节题型。 见文章第三句：RDAs are suggested amounts of calories，protein，and some minerals and vitamins for an adequate diet．选项D正确，选项A、B、C都不全面。
．②和④ D．②和③