They showed me a medicine that was scientifically ______ from human hair and used in helping their growth.
A.learned
B.chosen
C.prepared
D.separated
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D解析试题分析：考查动词辨析：
A. learn学习，
B. choose选择，
C. prepare准备
D. separate分离，句意是：他们给我看了一种以科学手段从人的头发分离出来的药，并被用来帮助他们生长。选C。考点; 考查动词辨析点评：这几个动词都可以和from搭配，learn from“向…学习”，choose from“从…中选择”， separate from从…中分离，在平时的学习中加强识记。