单项选择题
A.全部报告法B.部分报告法C.自由回忆法D.序列回忆法
A.12B.10C.8D.30
A.show the primitive medical practice in the past.B.demonstrate the cruelty of slavery in his days.C.stress the role of slaves in the U.S. history.D.reveal some unknown aspect of his life.