12.跨世代效應(cross-generational effect)最容易發生在下列何者的研究設計中？
(A)橫斷法(cross-sectional designs)
(B)縱貫法(longitudinal designs)
(C)系列法(sequential design)
(D)回溯法(retrospective method)

答案：✅ (B) 縱貫法（longit...