单选题 Some anthropologists claim that a few apes have been taught a rudimentary sign languages, but skeptics argue that the apes are only______ their trainers.
【正确答案】 A
【答案解析】imitating“模仿，效法”；condoning“宽恕，赦免”；instructing“指导，教”： acknowledging“承认，答谢”。根据句意和各个选项的意思可知，正确答案是A。