R ___________has been found to occur usually in children's pronunciation or reporting of the truthfulness of utterances, rather than in the grammaticality of sentences.
【正确答案】：Reinforcement(P246)解析:研究者发现纠错与加强并非如人们所说的那样是影响儿童语言发展的关键性因素。强化现象通常出现在儿童的语音方面或涉及话语真实性的时候,而和句子语法正确与否关系不大。