Some anthropologists claim that a few apes have been taught a rudimentary sign language, but skeptics argue that the apes are only ________ their trainers.
句意： 一些人类学家声称， 一些猿类已经被传授了一种基本的手语，但怀疑论者认为， 猿类只是在模仿他们的训练者。 imitate模仿。 condone宽恕。 instruct指导。 acknowledge承认。