问题详情

WhatcanwelearnfromtheFloridastudy？查看材料
A.Follow-upstudiesshouldlastforoneyear.
B.Volunteersshouldgetmentallyprepared.
C.Strategytrainingisamustinresearch.
D.Volunteersareprovidedwithconcreteadvice.
请帮忙给出正确答案和分析，谢谢！