All normal human beings acquire their n ______language at a give

All normal human beings acquire their n ______language at a given time of life and in an appropriate linguistic environment.
【正确答案】：native(P240)解析:不论人们的文化背景如何,所有正常人都能在他们生命的特定阶段,在被提供了充分的接触语言机会的合适语言环境中,习得他们的本族语。